Product Overview
The 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.
A 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.
This 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.
Key Features:
- Retrofit hot-water recirculation system
- Designed for compatible tank-style water heaters
- Does not require a dedicated return line
- Built-in operating timer
- Stainless steel pump housing
- Comfort Valve kit included
- 115V plug-in operation
Common Uses:
- Reducing hot-water wait time at distant fixtures
- Retrofitting homes without a dedicated return pipe
- Reducing cold-water runoff before warmer water arrives
- Scheduled residential hot-water circulation
Technical Specifications:
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Model: UP 15-10 SU7PTLC-1 Comfort System
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Product Number: 595916
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Voltage: 115V, 60 Hz
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Maximum Power Input: 25W
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Current: 0.23A
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Rated Flow: 3.17 GPM
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Maximum Flow: 6.16 GPM
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Rated Head: 2.661 ft
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Maximum Head: 5.25 ft
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Connection: 3/4 in. NPSM
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Port-to-Port Length: 5-1/8 in.
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Maximum Operating Pressure: 145.04 PSI
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Liquid Temperature Range: 35.6-150.8°F
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Power Plug: NEMA 5-15P
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Approvals: CUL, NSF, and UPC
Dimensions and Weight:
Installation Notes:
Confirm 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.
FAQ:
Does this system need a dedicated return line?
No. The included Comfort Valve allows the compatible cold-water line to serve as the temporary return path.
Can it be used with a tankless water heater?
No. This listing identifies it for tank-style water heaters only.
Does it provide hot water instantly?
No. It reduces wait time by circulating water according to the system layout and timer schedule.
What older product numbers are referenced?
500800 and 99452459 are listed as replacement references; confirm compatibility before substitution.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear technical information, helpful support, and convenient online ordering for hot-water recirculation systems.
