{"title":"Recirculating Pumps","description":"\u003cdiv class=\"collection-intro\"\u003e\n\u003cp\u003e\u003cstrong\u003eRecirculating pumps\u003c\/strong\u003e bring hot water to fixtures faster and keep hydronic loops moving efficiently. Shop potable-water circulators for domestic hot water (DHW), cast-iron pumps for heating, under-sink “comfort” kits for homes without a return line, and smart ECM models that learn usage and save energy.\u003c\/p\u003e\n\u003ch3\u003eShop by need\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDHW bronze\/stainless circulators:\u003c\/strong\u003e potable-rated pumps for dedicated return lines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnder-sink retrofit kits:\u003c\/strong\u003e pump + crossover\/comfort valve for homes without a return line (uses the cold line as a temporary return)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydronic heating circulators:\u003c\/strong\u003e cast-iron wet-rotor pumps for radiant\/baseboard\/boiler loops\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-efficiency ECM:\u003c\/strong\u003e variable-speed\/auto-adapt models that cut power draw and reduce noise\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControls \u0026amp; accessories:\u003c\/strong\u003e timers, temperature sensors\/aquastats, check\/isolation valves, unions\/flanges, replacement cartridges\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"519651","title":"Grundfos - 519651 - 3\/4\" 15\/16 Bronze Flange Set","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos 519651 3\/4 in. Bronze Flange Set\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 519651\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos 519651 is a bronze flange set for connecting compatible Grundfos UP and UPS circulator pumps to 3\/4 in. threaded piping. A matched flange pair creates serviceable pipe connections on both sides of the pump, allowing the circulator to be installed, removed, or replaced without fabricating an improvised mounting arrangement.\u003c\/p\u003e\n\u003cp\u003eThe kit includes two bronze flanges, two gaskets, and four bolts with nuts. Compatibility depends on the pump's flange pattern, port size, connection style, and system fluid. Confirm the complete Grundfos pump model and connection dimensions before ordering, especially when replacing older hardware or adapting an existing circulator installation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBronze circulator flange set\u003c\/li\u003e\n\u003cli\u003e3\/4 in. threaded pipe connection\u003c\/li\u003e\n\u003cli\u003eFor compatible Grundfos UP and UPS pumps\u003c\/li\u003e\n\u003cli\u003eIncludes matched gaskets and installation hardware\u003c\/li\u003e\n\u003cli\u003eSupports pump removal and service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstalling a compatible Grundfos circulator\u003c\/li\u003e\n\u003cli\u003eReplacing worn or corroded pump flanges\u003c\/li\u003e\n\u003cli\u003eServicing hydronic or hot-water circulation piping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 519651\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bronze flange set\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Connection:\u003c\/strong\u003e 3\/4 in. threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Two flanges, two gaskets, and four bolts with nuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Compatibility:\u003c\/strong\u003e Confirm for the specific Grundfos UP or UPS circulator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Installation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eVerify the pump flange pattern, port size, system material, fluid, pressure, and temperature before installation. Replace damaged gaskets and tighten the flange hardware evenly according to the pump instructions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAre gaskets and bolts included?\u003c\/strong\u003e\u003cbr\u003eYes. The confirmed product data lists two gaskets and four bolts with nuts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit every Grundfos circulator?\u003c\/strong\u003e\u003cbr\u003eNo. Confirm the exact UP or UPS pump model and flange pattern.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear product information, helpful support, and convenient online ordering for circulator pumps and installation hardware.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":8998957699,"sku":"519651","price":49.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/products\/mechanical-3-4-15-16-bronze-flange-set-1.jpg?v=1585059357"},{"product_id":"595926","title":"Grundfos 595926 — Replacement Comfort Valve for UP Comfort Series Circulators","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos 595926 Replacement Comfort Valve\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 595926\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos 595926 is a replacement Comfort Valve for the compatible UP15-10SU7P\/TLC Comfort Series hot-water recirculation system. In this retrofit system, the valve is installed beneath the sink at the fixture farthest from the water heater. It provides a crossover path that allows the Comfort Series circulator to move cooled water from the hot line through the cold line until the valve responds to the arriving warmer water.\u003c\/p\u003e\n\u003cp\u003eThis arrangement can reduce the amount of cold water discharged while waiting for hot water at the distant fixture, without requiring a dedicated return pipe. The 595926 is a replacement valve only; the circulator pump, connecting hoses, shutoff valves, and other system components are not included. Confirm the existing Comfort Series model and installation configuration before ordering.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacement Comfort Valve\u003c\/li\u003e\n\u003cli\u003eFor the compatible UP15-10SU7P\/TLC Comfort Series system\u003c\/li\u003e\n\u003cli\u003eInstalls beneath the farthest sink fixture\u003c\/li\u003e\n\u003cli\u003eSupports retrofit recirculation without a dedicated return line\u003c\/li\u003e\n\u003cli\u003ePassive valve operation does not require a separate power connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplacing a worn or malfunctioning Comfort Valve\u003c\/li\u003e\n\u003cli\u003eRestoring operation of a compatible Grundfos retrofit recirculation system\u003c\/li\u003e\n\u003cli\u003eReducing cold-water runoff while waiting for hot water\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 595926\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Replacement crossover Comfort Valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible System:\u003c\/strong\u003e Grundfos UP15-10SU7P\/TLC Comfort Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Location:\u003c\/strong\u003e Beneath the fixture farthest from the water heater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Replacement valve only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Installation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eConfirm the pump model, existing valve arrangement, supply connections, and current Grundfos instructions. Shut off the water, relieve pressure, and check all connections for leakage after installation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhere is the Comfort Valve installed?\u003c\/strong\u003e\u003cbr\u003eIt is installed beneath the sink at the fixture farthest from the water heater in the compatible system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the circulator pump included?\u003c\/strong\u003e\u003cbr\u003eNo. This listing is for the replacement Comfort Valve only.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear product information, helpful support, and convenient online ordering for hot-water recirculation products and replacement parts.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":8998958019,"sku":"595926","price":87.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/595926.png?v=1760643600"},{"product_id":"595916","title":"Grundfos UP 15-10 SU7PTLC-1 —  595916 Comfort System Hot Water Recirculation Pump","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos 595916 UP 15-10 Comfort System Recirculation Pump\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 595916\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos 595916 UP 15-10 SU7PTLC-1 Comfort System is a retrofit hot-water recirculation package for compatible tank-style water-heater systems that do not have a dedicated return line. The stainless steel circulator is installed at the water heater, while the included Comfort Valve is placed beneath the fixture farthest from the heater. The existing cold-water line then serves as the temporary return path while the pump is operating.\u003c\/p\u003e\n\u003cp\u003eA built-in timer allows circulation to be scheduled around the household's typical hot-water use rather than running continuously. This arrangement can reduce the volume of cold water sent down the drain while waiting for warmer water to reach a distant fixture. It does not create hot water instantly, and performance depends on pipe length, layout, insulation, water-heater condition, and the timer schedule.\u003c\/p\u003e\n\u003cp\u003eThis product is specified for compatible tanked water-heater installations and is not identified for tankless water heaters. The package includes the pump with line cord, timer, and Comfort Valve kit. Replacement references listed for this product are 500800 and 99452459; confirm the complete system and connection requirements before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRetrofit hot-water recirculation system\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible tank-style water heaters\u003c\/li\u003e\n\u003cli\u003eDoes not require a dedicated return line\u003c\/li\u003e\n\u003cli\u003eBuilt-in operating timer\u003c\/li\u003e\n\u003cli\u003eStainless steel pump housing\u003c\/li\u003e\n\u003cli\u003eComfort Valve kit included\u003c\/li\u003e\n\u003cli\u003e115V plug-in operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReducing hot-water wait time at distant fixtures\u003c\/li\u003e\n\u003cli\u003eRetrofitting homes without a dedicated return pipe\u003c\/li\u003e\n\u003cli\u003eReducing cold-water runoff before warmer water arrives\u003c\/li\u003e\n\u003cli\u003eScheduled residential hot-water circulation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e UP 15-10 SU7PTLC-1 Comfort System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 595916\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Power Input:\u003c\/strong\u003e 25W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent:\u003c\/strong\u003e 0.23A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Flow:\u003c\/strong\u003e 3.17 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Flow:\u003c\/strong\u003e 6.16 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Head:\u003c\/strong\u003e 2.661 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Head:\u003c\/strong\u003e 5.25 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e 3\/4 in. NPSM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort-to-Port Length:\u003c\/strong\u003e 5-1\/8 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e 145.04 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid Temperature Range:\u003c\/strong\u003e 35.6-150.8°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Plug:\u003c\/strong\u003e NEMA 5-15P\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e CUL, NSF, and UPC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDimensions and Weight:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Weight:\u003c\/strong\u003e 5.51 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eConfirm a compatible tank water heater, pipe layout, fixture location, electrical receptacle, and connection sizes. Install the Comfort Valve at the farthest fixture and follow the linked Grundfos submittal and installation instructions. Check all connections for leaks and set the timer for actual use periods.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this system need a dedicated return line?\u003c\/strong\u003e\u003cbr\u003eNo. The included Comfort Valve allows the compatible cold-water line to serve as the temporary return path.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used with a tankless water heater?\u003c\/strong\u003e\u003cbr\u003eNo. This listing identifies it for tank-style water heaters only.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it provide hot water instantly?\u003c\/strong\u003e\u003cbr\u003eNo. It reduces wait time by circulating water according to the system layout and timer schedule.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat older product numbers are referenced?\u003c\/strong\u003e\u003cbr\u003e500800 and 99452459 are listed as replacement references; confirm compatibility before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear technical information, helpful support, and convenient online ordering for hot-water recirculation systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":8998958851,"sku":"595916","price":321.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/595916.png?v=1760636570"},{"product_id":"59896781","title":"Grundfos UPS 15-55 SUC — 59896781  Stainless-Steel Circulator Pump with Union Connections","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos UPS 15-55 SUC 59896781 Stainless Steel Circulator Pump\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 59896781\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos UPS 15-55 SUC model 59896781 is a three-speed stainless steel wet-rotor circulator for compatible water-circulation systems. Three selectable speed settings allow the installer to adjust pump output to better match the loop's calculated flow and head requirements rather than relying on one fixed operating range. The stainless steel housing and union connection format support applications where the complete system documentation permits this pump construction.\u003c\/p\u003e\n\u003cp\u003eConfirmed hydraulic data lists a rated flow of 11.1 GPM, maximum flow of 25.1 GPM, rated head of 8.042 ft, and maximum head of 18.05 ft. These values represent separate points on the performance curve. Select the speed setting from the actual system resistance, pipe length, diameter, valves, fittings, temperature, and required circulation rate.\u003c\/p\u003e\n\u003cp\u003eThe pump includes a built-in isolating and non-return valve configuration identified in the confirmed specifications. It operates on 115V single-phase power, with current draw ranging from 0.53A to 0.75A by speed. Replacement references listed for this model include 59896225, 59896778, and 59896246; confirm the union connection, hydraulic duty, and electrical data before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThree-speed stainless steel circulator pump\u003c\/li\u003e\n\u003cli\u003eWet-rotor operating design\u003c\/li\u003e\n\u003cli\u003eSelectable output for system balancing\u003c\/li\u003e\n\u003cli\u003eBuilt-in isolating and non-return valve configuration\u003c\/li\u003e\n\u003cli\u003e1-1\/4 in. NPSM stainless steel union connection\u003c\/li\u003e\n\u003cli\u003e115V single-phase operation\u003c\/li\u003e\n\u003cli\u003eImpedance-protected motor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible hot-water circulation systems\u003c\/li\u003e\n\u003cli\u003eWater loops requiring selectable pump speeds\u003c\/li\u003e\n\u003cli\u003eReplacement of a matching stainless steel union circulator\u003c\/li\u003e\n\u003cli\u003eResidential and light system-balancing applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e UPS 15-55 SUC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 59896781\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Settings:\u003c\/strong\u003e Three\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Power Input:\u003c\/strong\u003e 87W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent by Speed:\u003c\/strong\u003e 0.53A \/ 0.69A \/ 0.75A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Flow:\u003c\/strong\u003e 11.1 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Flow:\u003c\/strong\u003e 25.1 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Head:\u003c\/strong\u003e 8.042 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Head:\u003c\/strong\u003e 18.05 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e 1-1\/4 in. NPSM stainless steel union\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort-to-Port Length:\u003c\/strong\u003e 5-15\/16 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e 145.04 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid Temperature Range:\u003c\/strong\u003e 35.6-203°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimer Temperature Note:\u003c\/strong\u003e Maximum 150°F when equipped with a timer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e UL and CSA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDimensions and Weight:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Weight:\u003c\/strong\u003e 4.94 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Weight:\u003c\/strong\u003e 5.79 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation and Sizing Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eChoose the speed that meets the required flow at system head without excessive velocity or noise. Confirm union compatibility, valve arrangement, liquid temperature, pressure, electrical supply, pump orientation, and air removal. Follow the linked Grundfos documentation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many speed settings are available?\u003c\/strong\u003e\u003cbr\u003eThree selectable speeds are confirmed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the confirmed maximum flow?\u003c\/strong\u003e\u003cbr\u003eThe confirmed maximum flow is 25.1 GPM at the applicable pump-curve point.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature limit applies with a timer?\u003c\/strong\u003e\u003cbr\u003eThe confirmed data states a 150°F maximum liquid temperature when equipped with a timer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat replacement references are listed?\u003c\/strong\u003e\u003cbr\u003e59896225, 59896778, and 59896246; verify the complete application before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear technical information, helpful support, and convenient online ordering for circulator pumps and water-circulation systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":8998959363,"sku":"59896781","price":636.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/59896781_front_view.png?v=1760640493"},{"product_id":"rinnai-rwmkt01p","title":"Rinnai - RWMKT01P - Control-R Wireless Demand Recirculation Kit (Pump+Push Button)","description":"\u003ch3\u003e\u003cspan style=\"color: #ff2a00;\"\u003eRinnai Control-R Wi-Fi Module and mobile app no longer are compatible w\/ the RUCS\/RUS Tankless Water Heaters\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eRinnai Control-R Kit with Push-Button, and Grundfos Recirculation Pump (Includes Grundfos GTK03 Kit with Rinnai Circ-Logic Manual).\u003c\/p\u003e\n\u003ch2\u003eControl Your Rinnai Tankless Water Heater with the Touch of a Button\u003c\/h2\u003e\n\u003cp\u003eWith Rinnai's Control-R™ Wi-Fi Module, new and existing Rinnai Residential and Commercial Tankless Water Heaters (2006 and newer) can be remotely monitored and controlled via smart devices. Rinnai now has the capability to provide a new option for management, control and maintenance of Rinnai Tankless Water Heaters.\u003c\/p\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/FTHKqOHuQOA?list=PLtuJEua3pOADA0Cvndy2Eh1SrKGkwTadz\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\n\u003cp\u003e\u003cb\u003eControl and Monitoring\u003c\/b\u003e\u003cbr\u003e Control the Rinnai Tankless Water Heater from a smart phone or tablet to turn the system on\/off, change the water temperature and monitor status.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRemote Diagnostics and Maintenance\u003c\/b\u003e\u003cbr\u003e Gives technicians detailed system information via automatic alerts and remote diagnostic tools before ever leaving their place of business, leading to shorter maintenance and repair times.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAccessibility and Convenience\u003c\/b\u003e\u003cbr\u003e Get instant access to technical bulletins, product warranty, product registration, manuals, step-by-step repair guides and more!\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 3.69\"w x 3.69\"h x 1.18\"d (94 mm x 94 mm x 30 mm)\u003c\/li\u003e\n\u003cli\u003eWeight: 4.8 oz (0.14 kg) Shipping Carton: 6 oz (0.17 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFeatures\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWorks with all Rinnai Tankless Water Heater models manufactured 2006 and newer (except RH180 Hybrid Tank-Tankless Water Heaters).\u003c\/li\u003e\n\u003cli\u003eThe Lime Condition (LC) notification will not appear in the Rinnai App when the Control-R™ Wi-Fi Module is paired with the following series of Rinnai Tankless Water Heaters manufactured prior to 2009: VA, VB, KA and V53e.\u003c\/li\u003e\n\u003cli\u003eAttaches to side of water heater via magnetic enclosure (indoor models only) or mounts to an indoor wall with supplied mounting hardware.\u003c\/li\u003e\n\u003cli\u003ePairs with only one Rinnai Tankless Water Heater.\u003c\/li\u003e\n\u003cli\u003eIncluded with purchase: Control-R™ Wi-Fi Module with 5 feet (1.5 m) of wire for water heater connection; wall mounting hardware (2 anchors and 2 screws); and Rinnai Control-R™ Wi-Fi Module Installation Manual.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTitle 24 Compliant - meets California Energy Commission's Title 24 requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInstallation Requirements\u003c\/b\u003e\u003cbr\u003e Choose a central location inside the home or business where the Wi-Fi signal is strong. If the Rinnai Tankless Water Heater is located where the Wi-Fi signal is weak (such as basements or a mechanical room), the module is designed so that wiring can run up to 300 feet (91 m) away from the water heater to ensure a strong Wi-Fi signal (18-22 gauge wire is required).\u003c\/p\u003e\nThe module must be installed indoors. Adequate space must surround the module for service and support needs.\n\u003cp\u003e\u003cb\u003eSupported Devices\u003c\/b\u003e\u003cbr\u003e Apple® devices (iPhone, iPad, etc.) running operating system 8.0 or higher. \u003cbr\u003eAndroid® devices (phones, tablets, etc.) running operating system 4.4 or higher. \u003cbr\u003eBlackBerry® devices are not supported.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompatibility\u003c\/b\u003e\u003cbr\u003e 802.11N Wi-Fi Network up to 2.4 GHz. \u003cbr\u003eNot compatible with MC-195T-US or MC-100V controllers.\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe new Control-R™ Wi-Fi Module attaches easily to the Rinnai Tankless Water Heater by a two-wire interface quickly connecting through your Wi-Fi network for monitoring. Once connected and the free Rinnai app is downloaded, the Rinnai Tankless Water Heater can be controlled using your smart phone or tablet.\u003c\/p\u003e\n\u003cp\u003eThe free Rinnai App is available from the Apple® Store or Google® Play Store.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/Owner_Dealer_Access_Illustration_trns-min.png?152817525978986415\"\u003e\n\u003cp\u003eRECIRCULATION CAPABILITY\u003cbr\u003e If your system has recirculation capability, you can activate recirculation though the use of the Control-R™ Wi-Fi Module, motion sensor or push button for faster hot water.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.bigfrogsupply.com\/products\/rinnai-rwmpb01\" target=\"_blank\"\u003ePush Button \u003c\/a\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bigfrogsupply.com\/products\/rinnai-rwmms01\" target=\"_blank\"\u003e| Part #: RWMPB01\u003c\/a\u003e |\u003c\/b\u003e Mounted near the point of use, like a kitchen faucet or bathroom sink, and operates the recirculation system.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"#temp_created_link\"\u003eMotion Sensor Part \u003c\/a\u003e\u003cb\u003e\u003ca href=\"#temp_created_link\"\u003e| #: RWMMS01\u003c\/a\u003e |\u003c\/b\u003e Mounted near the point of use and operates the recirculation system with the detection of motion and full-body movement up to 30 feet (9 m).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cbr\u003e\u003c\/h5\u003e","brand":"Rinnai","offers":[{"title":"Default Title","offer_id":35264043459,"sku":"RWMKT01P","price":626.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/products\/water-heater-controllers-control-r-wireless-demand-recirculation-kit-pump-push-button-1.jpg?v=1572963096"},{"product_id":"rinnai-rwmkt03p","title":"Rinnai - RWMKT03P - Control-R Wireless Demand Recirculation Kit (Pump+Push Button,Temp Sensor)","description":"\u003ch3\u003e\u003cspan style=\"color: #ff2a00;\"\u003eRinnai Control-R Wi-Fi Module and mobile app no longer are compatible w\/ the RUCS\/RUS Tankless Water Heaters\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eRinnai Control-R Kit with Push-Button, Temperature Sensor (Turns off the recirculation system when the water has reached the set temperature. Compatible only with Rinnai Tankless Water Heaters featuring Rinnai Circ-Logic™. ), and Grundfos Recirculation Pump (Includes Grundfos GTK03 Kit with Rinnai Circ-Logic Manual).\u003c\/p\u003e\n\u003ch2\u003eControl Your Rinnai Tankless Water Heater with the Touch of a Button\u003c\/h2\u003e\n\u003cp\u003eWith Rinnai's Control-R™ Wi-Fi Module, new and existing Rinnai Residential and Commercial Tankless Water Heaters (2006 and newer) can be remotely monitored and controlled via smart devices. Rinnai now has the capability to provide a new option for management, control and maintenance of Rinnai Tankless Water Heaters.\u003c\/p\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/FTHKqOHuQOA?list=PLtuJEua3pOADA0Cvndy2Eh1SrKGkwTadz\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\n\u003cp\u003e\u003cb\u003eControl and Monitoring\u003c\/b\u003e\u003cbr\u003e Control the Rinnai Tankless Water Heater from a smart phone or tablet to turn the system on\/off, change the water temperature and monitor status.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRemote Diagnostics and Maintenance\u003c\/b\u003e\u003cbr\u003e Gives technicians detailed system information via automatic alerts and remote diagnostic tools before ever leaving their place of business, leading to shorter maintenance and repair times.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAccessibility and Convenience\u003c\/b\u003e\u003cbr\u003e Get instant access to technical bulletins, product warranty, product registration, manuals, step-by-step repair guides and more!\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 3.69\"?w x 3.69\"h x 1.18\"?d (94 mm x 94 mm x 30 mm)\u003c\/li\u003e\n\u003cli\u003eWeight: 4.8 oz (0.14 kg) Shipping Carton: 6 oz (0.17 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFeatures\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWorks with all Rinnai Tankless Water Heater models manufactured 2006 and newer (except RH180 Hybrid Tank-Tankless Water Heaters).\u003c\/li\u003e\n\u003cli\u003eThe Lime Condition (LC) notification will not appear in the Rinnai App when the Control-R™ Wi-Fi Module is paired with the following series of Rinnai Tankless Water Heaters manufactured prior to 2009: VA, VB, KA and V53e.\u003c\/li\u003e\n\u003cli\u003eAttaches to side of water heater via magnetic enclosure (indoor models only) or mounts to an indoor wall with supplied mounting hardware.\u003c\/li\u003e\n\u003cli\u003ePairs with only one Rinnai Tankless Water Heater.\u003c\/li\u003e\n\u003cli\u003eIncluded with purchase: Control-R™ Wi-Fi Module with 5 feet (1.5 m) of wire for water heater connection; wall mounting hardware (2 anchors and 2 screws); and Rinnai Control-R™ Wi-Fi Module Installation Manual.?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eTitle 24 Compliant - meets California Energy Commission's Title 24 requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInstallation Requirements\u003c\/b\u003e\u003cbr\u003e Choose a central location inside the home or business where the Wi-Fi signal is strong. If the Rinnai Tankless Water Heater is located where the Wi-Fi signal is weak (such as basements or a mechanical room), the module is designed so that wiring can run up to 300 feet (91 m) away from the water heater to ensure a strong Wi-Fi signal (18-22 gauge wire is required).\u003c\/p\u003e\nThe module must be installed indoors. Adequate space must surround the module for service and support needs.\n\u003cp\u003e\u003cb\u003eSupported Devices\u003c\/b\u003e\u003cbr\u003e Apple® devices (iPhone, iPad, etc.) running operating system 8.0 or higher. \u003cbr\u003eAndroid® devices (phones, tablets, etc.) running operating system 4.4 or higher. \u003cbr\u003eBlackBerry® devices are not supported.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompatibility\u003c\/b\u003e\u003cbr\u003e 802.11N Wi-Fi Network up to 2.4 GHz. \u003cbr\u003eNot compatible with MC-195T-US or MC-100V controllers.\u003c\/p\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe new Control-R Wi-Fi Module attaches easily to the Rinnai Tankless Water Heater by a two-wire interface quickly connecting through your Wi-Fi network for monitoring. Once connected and the free Rinnai app is downloaded, the Rinnai Tankless Water Heater can be controlled using your smart phone or tablet.\u003c\/p\u003e\n\u003cp\u003eThe free Rinnai App is available from the Apple® Store or Google® Play Store.\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/Owner_Dealer_Access_Illustration_trns-min.png?152817525978986415\"\u003e\n\u003cp\u003eRECIRCULATION CAPABILITY\u003cbr\u003e If your system has recirculation capability, you can activate recirculation though the use of the Control-R™ Wi-Fi Module, motion sensor or push button for faster hot water.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.bigfrogsupply.com\/products\/rinnai-rwmpb01\"\u003ePush Button \u003c\/a\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bigfrogsupply.com\/products\/rinnai-rwmms01\"\u003e| Part #: RWMPB01\u003c\/a\u003e |\u003c\/b\u003e Mounted near the point of use, like a kitchen faucet or bathroom sink, and operates the recirculation system.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"#temp_created_link\"\u003eMotion Sensor Part \u003c\/a\u003e\u003cb\u003e\u003ca href=\"#temp_created_link\"\u003e| #: RWMMS01\u003c\/a\u003e |\u003c\/b\u003e Mounted near the point of use and operates the recirculation system with the detection of motion and full-body movement up to 30 feet (9 m).\u003c\/li\u003e\n\u003cli\u003eTemperature Sensor \u003cb\u003e| Part #: RWMTS01 |\u003c\/b\u003e Turns off the recirculation system when the water has reached the set temperature. Compatible only with Rinnai Tankless Water Heaters featuring Rinnai Circ-Logic™.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cbr\u003e\u003c\/h5\u003e","brand":"Rinnai","offers":[{"title":"Default Title","offer_id":35264043779,"sku":"RWMKT03P","price":806.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/products\/water-heater-controllers-control-r-wireless-demand-recirculation-kit-pump-push-button-temp-sensor-1.jpg?v=1671774503"},{"product_id":"grundfos-3-4-inch-half-union-threaded-end-pair","title":"Grundfos 529912 — 3\/4″ Bronze Union Threaded End Pair for UP\/UPS Pumps","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos 529912 3\/4 in. Bronze Union End Pair\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 529912\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos 529912 is a pair of bronze threaded union ends for compatible Grundfos UP and UPS circulator pumps that use the GU-125 union connection. The detachable union arrangement allows the pump to be separated from the piping for service or replacement without cutting the connected pipe when the system is correctly installed.\u003c\/p\u003e\n\u003cp\u003eThe pair includes two union nuts, two gaskets, and the threaded adapters needed for the listed 3\/4 in. NPT pipe connection. Compatibility must be confirmed by the pump's union standard and connection size rather than by appearance alone. Verify that the pump uses the GU-125 connection and that the system fluid, pressure, temperature, and piping materials are suitable for bronze fittings.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePair of bronze threaded union ends\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible GU-125 union pumps\u003c\/li\u003e\n\u003cli\u003e3\/4 in. NPT pipe connection\u003c\/li\u003e\n\u003cli\u003eIncludes nuts, gaskets, and adapters\u003c\/li\u003e\n\u003cli\u003eSupports circulator removal and service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInstalling a compatible UP or UPS union circulator\u003c\/li\u003e\n\u003cli\u003eReplacing damaged union connection components\u003c\/li\u003e\n\u003cli\u003eCreating a removable pump-to-pipe connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 529912\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnion Standard:\u003c\/strong\u003e GU-125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Connection:\u003c\/strong\u003e 3\/4 in. NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Two nuts, two gaskets, and adapters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Installation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eConfirm the exact circulator model and GU-125 union connection before purchase. Use new gaskets, support the piping, and follow the Grundfos installation instructions when tightening the union assemblies.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAre both union ends included?\u003c\/strong\u003e\u003cbr\u003eYes. This listing is for a pair with nuts, gaskets, and adapters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit any 3\/4 in. circulator?\u003c\/strong\u003e\u003cbr\u003eNo. The pump must also use the compatible GU-125 union connection.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear product information, helpful support, and convenient online ordering for circulator pumps and connection hardware.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":43101180419,"sku":"529912","price":40.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/products\/mechanical-grundfos-3-4-inch-half-union-threaded-end-pair-1.jpg?v=1571439530"},{"product_id":"grundfos-519601-3-4-inch-gf-15-26-cast-iron-flange-set","title":"Grundfos 519601 — 3\/4″ Cast Iron GF15\/26 Flange Set for UP\/UPS Circulators","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos 519601 3\/4 in. GF15\/26 Cast Iron Flange Set\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 519601\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos 519601 is a cast iron flange set for compatible VersaFlo UP and UPS circulator pumps that use the GF15\/26 connection standard. The flanges provide a threaded transition between the circulator and 3\/4 in. NPT system piping, creating a removable connection for installation, replacement, and future pump service.\u003c\/p\u003e\n\u003cp\u003eThe set includes two cast iron flanges, two gaskets, and two bolts with nuts. Because circulator families can use different flange patterns and body materials, confirm the exact pump model, GF15\/26 connection, pipe size, and intended system fluid before ordering. Cast iron components are commonly selected for closed hydronic systems rather than potable-water circulation unless the complete installation documentation specifically permits that use.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGF15\/26 cast iron flange set\u003c\/li\u003e\n\u003cli\u003e3\/4 in. NPT pipe connections\u003c\/li\u003e\n\u003cli\u003eFor compatible VersaFlo UP and UPS circulators\u003c\/li\u003e\n\u003cli\u003eThreaded connection design\u003c\/li\u003e\n\u003cli\u003eGaskets and mounting hardware included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHydronic heating circulator installation\u003c\/li\u003e\n\u003cli\u003eReplacing compatible cast iron pump flanges\u003c\/li\u003e\n\u003cli\u003eCreating serviceable circulator connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 519601\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Standard:\u003c\/strong\u003e GF15\/26\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Connection:\u003c\/strong\u003e 3\/4 in. NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Cast iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Two flanges, two gaskets, and two bolts with nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Installation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eConfirm the Grundfos pump model, flange spacing, system material, fluid, pressure, and temperature. Install new gaskets and tighten the hardware evenly to avoid stressing the pump body.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat pump connection standard is used?\u003c\/strong\u003e\u003cbr\u003eThis set is identified for compatible GF15\/26 circulator connections.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs installation hardware included?\u003c\/strong\u003e\u003cbr\u003eYes. The set includes two gaskets and two bolts with nuts.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear product information, helpful support, and convenient online ordering for circulator pumps and installation hardware.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":19692175949920,"sku":"519601","price":20.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/519601_Flanges.png?v=1760642917"},{"product_id":"grundfos-gtk03-pump-kit-for-sensei-rinnias","title":"Rinnai \/ Grundfos GTK03U — Circ-Logic™ External Pump Kit (115 V) w\/ Union Connections","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eRinnai \/ Grundfos GTK03U Circ-Logic External Recirculation Pump Kit\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Rinnai \/ Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: GTK03U\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Rinnai \/ Grundfos GTK03U is an external recirculation-pump kit for compatible Rinnai tankless water heaters that support Circ-Logic control. It adds a Grundfos circulator with an internal check valve to an approved recirculation layout, allowing the heater's Circ-Logic settings to control scheduled or demand-based circulation according to the connected heater and installation design.\u003c\/p\u003e\n\u003cp\u003eThe kit includes the pump, prewired conduit with fuse protection, and connection components identified for the GTK03U installation. The required piping arrangement is model and application specific. Do not assume that this kit eliminates a dedicated return line or that every crossover configuration is approved. Follow the installation-manual section assigned to the exact Rinnai model and design the loop according to the manufacturer requirements.\u003c\/p\u003e\n\u003cp\u003eThe confirmed pump data lists a 20 GPM flow-range reference, 17 ft head range, 150°F maximum liquid temperature, 145 PSI maximum system pressure, 115V power, and 3\/4 in. flange connections. Total equivalent pipe length must be calculated by the installer; the confirmed data references up to 200 ft of equivalent 3\/4 in. piping at 120°F under the stated conditions.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExternal Circ-Logic recirculation-pump kit\u003c\/li\u003e\n\u003cli\u003eFor compatible Rinnai tankless water heaters\u003c\/li\u003e\n\u003cli\u003eGrundfos stainless steel circulator with internal check valve\u003c\/li\u003e\n\u003cli\u003ePrewired conduit with fuse protection\u003c\/li\u003e\n\u003cli\u003e3\/4 in. flange connection format\u003c\/li\u003e\n\u003cli\u003e115V, 60 Hz operation\u003c\/li\u003e\n\u003cli\u003eModel-specific installation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdding external recirculation to an approved Rinnai Circ-Logic heater\u003c\/li\u003e\n\u003cli\u003eDedicated-return or other manufacturer-approved loop configurations\u003c\/li\u003e\n\u003cli\u003eReducing hot-water wait time when the complete system is correctly designed\u003c\/li\u003e\n\u003cli\u003eReplacement of a matching GTK03U pump kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e GTK03U\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Housing:\u003c\/strong\u003e Stainless steel with internal check valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Reference:\u003c\/strong\u003e 20 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Range:\u003c\/strong\u003e 17 ft (5 m)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Liquid Temperature:\u003c\/strong\u003e 150°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum System Pressure:\u003c\/strong\u003e 145 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Amperage:\u003c\/strong\u003e 0.75A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection Size:\u003c\/strong\u003e 3\/4 in. flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCombined Pump and Flange-Kit Weight:\u003c\/strong\u003e 8.6 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Pipe-Length Reference:\u003c\/strong\u003e Up to 200 ft of 3\/4 in. piping at 120°F under the stated design conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eFollow Section 2 of the installation manual for the listed RU199i\/e, RU180i\/e, RU160i\/e, RU130i\/e, CU199i\/e, and CU160i\/e models. Follow Section 3 for the listed RLX94i, RL75i\/e VC, RL94i\/e VC, RU98i\/RUC98i and RU98e KB, and RU80i\/RUC80i and RU80e KB models. Confirm the complete model number and current Rinnai documentation before installation.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCalculate total equivalent pipe length, confirm the approved loop design, heater configuration, electrical supply, connection sizes, check-valve placement, insulation, and Circ-Logic settings. Installation should follow the Rinnai\/Grundfos manual and be completed by qualified plumbing and electrical professionals where required.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the GTK03U work with every Rinnai tankless water heater?\u003c\/strong\u003e\u003cbr\u003eNo. Use it only with compatible Circ-Logic models listed in the current installation instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this kit always remove the need for a return line?\u003c\/strong\u003e\u003cbr\u003eNo. The approved piping arrangement depends on the heater model and manufacturer instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum liquid temperature?\u003c\/strong\u003e\u003cbr\u003eThe confirmed maximum is 150°F.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow is allowable pipe length determined?\u003c\/strong\u003e\u003cbr\u003eThe installer must calculate the total equivalent length, including supply, return, and fittings.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear technical information, helpful support, and convenient online ordering for tankless-water-heater recirculation equipment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":28392583200864,"sku":"GTK03U","price":500.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/GTK03U_front_view.png?v=1760641529"},{"product_id":"3-speed-grundfos-pump-hot-water-circulator-pump-model-ups15-58fc-115v","title":"Grundfos UPS 15-58 FC — 59896341  3-Speed Circulator Pump for Heating and Cooling","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos UPS 15-58 FC 59896341 Three-Speed Cast Iron Circulator\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 59896341\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos UPS 15-58 FC model 59896341 is a three-speed cast iron wet-rotor circulator for compatible closed hydronic heating and cooling systems. Its selectable speeds allow the installer to match pump output more closely to the loop's calculated flow and head requirements, supporting system balancing across radiant-floor, baseboard, fan-coil, snow-melt, and other closed-loop applications.\u003c\/p\u003e\n\u003cp\u003eThe FC configuration uses two-bolt cast iron flange connections and includes an internal non-return valve arrangement identified in the confirmed specifications. Hydraulic data lists a rated flow of 8.5 GPM, maximum flow of 17.2 GPM, rated head of 10.47 ft, and maximum head of 19.36 ft. These values occur at different points on the curve, so pump selection and speed setting must be based on the actual system resistance.\u003c\/p\u003e\n\u003cp\u003eBecause this model has a cast iron housing, it should be selected for compatible closed-loop service rather than open potable-water circulation unless the manufacturer documentation for the exact installation states otherwise. Replacement references include HMCIR01, 59896248, 59896178, 8056173, and 59896155; confirm flange spacing, system duty, and electrical requirements before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThree-speed cast iron circulator\u003c\/li\u003e\n\u003cli\u003eFor compatible closed heating and cooling loops\u003c\/li\u003e\n\u003cli\u003eWet-rotor, maintenance-free operating design\u003c\/li\u003e\n\u003cli\u003eTwo-bolt cast iron flange connections\u003c\/li\u003e\n\u003cli\u003eBuilt-in non-return valve configuration\u003c\/li\u003e\n\u003cli\u003e115V single-phase operation\u003c\/li\u003e\n\u003cli\u003eImpedance-protected motor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHydronic heating loops\u003c\/li\u003e\n\u003cli\u003eRadiant-floor and baseboard systems\u003c\/li\u003e\n\u003cli\u003eFan-coil and compatible cooling loops\u003c\/li\u003e\n\u003cli\u003eSnow-melt circulation\u003c\/li\u003e\n\u003cli\u003eReplacement of a matching flanged circulator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e UPS 15-58 FC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 59896341\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Settings:\u003c\/strong\u003e Three\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Power Input:\u003c\/strong\u003e 87W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent by Speed:\u003c\/strong\u003e 0.55A \/ 0.66A \/ 0.75A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Flow:\u003c\/strong\u003e 8.5 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Flow:\u003c\/strong\u003e 17.2 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Head:\u003c\/strong\u003e 10.47 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Head:\u003c\/strong\u003e 19.36 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e Two-bolt cast iron flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort-to-Port Length:\u003c\/strong\u003e 6.54 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e 145.04 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid Temperature Range:\u003c\/strong\u003e 35.6-230°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e UL and CSA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDimensions and Weight:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Weight:\u003c\/strong\u003e 6.26 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Weight:\u003c\/strong\u003e 6.75 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation and Sizing Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCalculate the loop flow and head loss, then select the appropriate speed. Confirm flange spacing, system material, liquid temperature, pressure, electrical supply, pump orientation, air elimination, and check-valve requirements. Follow the linked Grundfos documents.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this pump intended for potable-water recirculation?\u003c\/strong\u003e\u003cbr\u003eThe cast iron housing is intended for compatible closed hydronic systems; do not assume approval for open potable-water service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the confirmed maximum flow?\u003c\/strong\u003e\u003cbr\u003eThe confirmed maximum flow is 17.2 GPM.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the FC model include a check valve?\u003c\/strong\u003e\u003cbr\u003eThe confirmed specifications identify a built-in non-return valve configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich replacement references are listed?\u003c\/strong\u003e\u003cbr\u003eHMCIR01, 59896248, 59896178, 8056173, and 59896155; confirm compatibility before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply provides clear technical information, helpful support, and convenient online ordering for hydronic circulators and heating-system components.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":30262173859936,"sku":"59896341","price":173.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/59896341.png?v=1760637931"},{"product_id":"grundfos-59896775-up15-29su-circulator-pump-1-12-hp-115v","title":"Grundfos UP 15-29 SU — 59896775  Stainless Steel Circulator Pump","description":"\u003cdiv class=\"product-meta\"\u003e\n\u003ch2\u003eGrundfos UP 15-29 SU 59896775 Stainless Steel Circulator Pump\u003c\/h2\u003e\n\u003cdiv class=\"product-meta-details\"\u003e\n\u003cspan class=\"product-brand\"\u003eBrand: Grundfos\u003c\/span\u003e\u003cspan class=\"product-sku\"\u003e | SKU: 59896775\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-description-details\"\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Grundfos UP 15-29 SU model 59896775 is a single-speed stainless steel wet-rotor circulator for compatible water-circulation systems that require corrosion-resistant pump construction. It is commonly selected for properly designed domestic hot-water recirculation loops and other water applications where the pump materials, temperature range, pressure rating, and hydraulic performance match the system. The compact in-line design uses stainless steel union connections for installation and future service.\u003c\/p\u003e\n\u003cp\u003eThe confirmed pump data lists a rated flow of 10.3 GPM, maximum flow of 20.7 GPM, rated head of 5.322 ft, and maximum head of 9.843 ft. These values occur at different points on the performance curve. Correct selection requires the system's required flow at calculated head loss, including pipe length, diameter, fittings, valves, elevation effects, and heat-source requirements.\u003c\/p\u003e\n\u003cp\u003eThis model operates on 115V single-phase power and has a confirmed maximum input of 87W. Union fittings are selected separately unless specifically included elsewhere in the order. This product identifies Grundfos 59896127 as a replacement reference; confirm connection style, hydraulic duty, and electrical requirements before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-speed stainless steel circulator pump\u003c\/li\u003e\n\u003cli\u003eWet-rotor, maintenance-free operating design\u003c\/li\u003e\n\u003cli\u003e115V single-phase power\u003c\/li\u003e\n\u003cli\u003e1-1\/4 in. NPSM stainless steel union connection\u003c\/li\u003e\n\u003cli\u003eImpedance-protected motor\u003c\/li\u003e\n\u003cli\u003eSuitable for continuous circulation when correctly sized and installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCommon Uses:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible domestic hot-water recirculation loops\u003c\/li\u003e\n\u003cli\u003eResidential water-circulation systems\u003c\/li\u003e\n\u003cli\u003eReplacement of a matching stainless steel union circulator\u003c\/li\u003e\n\u003cli\u003eApplications requiring the confirmed flow and head range\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e UP 15-29 SU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e 59896775\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Settings:\u003c\/strong\u003e One\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Power Input:\u003c\/strong\u003e 87W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent:\u003c\/strong\u003e 0.75A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Flow:\u003c\/strong\u003e 10.3 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Flow:\u003c\/strong\u003e 20.7 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated Head:\u003c\/strong\u003e 5.322 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Head:\u003c\/strong\u003e 9.843 ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e 1-1\/4 in. NPSM stainless steel union\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort-to-Port Length:\u003c\/strong\u003e 5-15\/16 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e 145.04 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLiquid Temperature Range:\u003c\/strong\u003e 35.6-203°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApprovals:\u003c\/strong\u003e UL and CSA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDimensions and Weight:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet Weight:\u003c\/strong\u003e 4.82 lb\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Weight:\u003c\/strong\u003e 5.69 lb\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation and Sizing Notes:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eCompare the system flow and head-loss calculation with the pump curve. Confirm union compatibility, water temperature, system pressure, electrical supply, pump orientation, air removal, and check-valve requirements. Follow the linked Grundfos specification sheet and installation manual.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the confirmed maximum flow?\u003c\/strong\u003e\u003cbr\u003eThe confirmed maximum flow is 20.7 GPM at the applicable point on the pump curve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum liquid temperature?\u003c\/strong\u003e\u003cbr\u003eThe confirmed liquid-temperature range extends to 203°F.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the union fittings included?\u003c\/strong\u003e\u003cbr\u003eThe pump uses 1-1\/4 in. NPSM stainless steel union connections; confirm whether the required mating union components are included or must be ordered separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat older product number is referenced?\u003c\/strong\u003e\u003cbr\u003eGrundfos 59896127 is listed as a replacement reference; verify the complete application before substitution.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Buy From Big Frog Supply?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eBig Frog Supply selected this From the Frog product for customers comparing compact stainless steel circulators. We provide clear technical information, helpful support, and convenient online ordering for hot-water circulation systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":38115385704620,"sku":"59896775","price":398.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/9352\/files\/59896775_front_view.png?v=1760639410"}],"url":"https:\/\/www.bigfrogsupply.com\/collections\/recirculating-pumps\/brand_grundfos+brand_rinnai.oembed","provider":"Big Frog Supply","version":"1.0","type":"link"}