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Whole Home Tankless Water Heaters

Whole-home tankless water heaters deliver endless hot water with compact, energy-smart designs. Shop natural gas/propane and high-output electric models, in indoor or outdoor versions, with options for built-in recirculation, Wi-Fi/app control, and clean concentric or twin-pipe venting. Finish installs with vent kits, isolation/flush valves, filters, and maintenance parts.

Shop by need

  • Fuel & power: Natural Gas (NG), Propane (LP), or 240V electric
  • Location: Indoor (vented) or Outdoor (climate/permitted)
  • Type: Condensing (highest efficiency) or Non-condensing
  • Recirculation: built-in pump models, recirc-ready units, or add-on kits
  • Venting: concentric or 2-pipe (PVC/CPVC/PP as specified) with terminations and pipe covers
  • Kits & parts: isolation/flush valves, condensate neutralizers, controllers/Wi-Fi modules, filters, and service parts

Quick choosing guide

  1. Size by demand: total your peak fixtures and calculate required GPM at your winter temperature rise. Whole-home gas units typically cover multi-bath demand; electric whole-home requires adequate amperage and is climate-dependent.
  2. Pick fuel & service: verify gas meter/line capacity and regulator for NG/LP models, or panel amperage/breaker space for electric.
  3. Choose location: Indoor where you can vent; Outdoor where climate/clearances allow and venting is impractical.
  4. Efficiency & condensate: condensing units save energy—plan a drain and consider a condensate neutralizer.
  5. Faster hot water: select a built-in recirc model or add a recirc kit/crossover; set schedules to cut wait time.
  6. Complete the kit: vent kit/terminations, isolation/flush valves, controller or Wi-Fi, and inlet water filtration/scale control as needed.
  7. Maintenance: flush/descale periodically (more often with hard water) to protect the heat exchanger.


  • Sold out

    Rheem - RTG-70DVLN-3 - Mid Efficiency 70 Direct Vent Indoor Natural Gas EcoNet Enabled Tankless Water Heater

    Rheem
    $ 804.00 - $ 804.00
    $ 804.00
    $ 804.00 - $ 804.00
    $ 804.00

    Spec Sheet Mid Efficiency 70 Direct Vent Indoor Natural Gas EcoNet Enabled Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a s...

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    $ 804.00 - $ 804.00
    $ 804.00
    $ 804.00 - $ 804.00
    $ 804.00
    Sold out

  • Rinnai - RWMKT03P - Control-R Wireless Demand Recirculation Kit (Pump+Push Button,Temp Sensor)

    Rinnai
    $ 806.00 - $ 806.00
    $ 806.00
    $ 806.00 - $ 806.00
    $ 806.00

    Rinnai Control-R Wi-Fi Module and mobile app no longer are compatible w/ the RUCS/RUS Tankless Water Heaters Rinnai Control-R Kit with Push-Butto...

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    $ 806.00 - $ 806.00
    $ 806.00
    $ 806.00 - $ 806.00
    $ 806.00
  • Rinnai - Rinnai Shingle Roof Flashing (8/12 to 16/12 pitch) 189952 - - Water Heater Venting - Big Frog Supply - 2
    Sold out

    Rinnai - 189952 - Shingle Roof Flashing (8/12 to 16/12 pitch)

    Rinnai
    $ 87.00 - $ 87.00
    $ 87.00
    $ 87.00 - $ 87.00
    $ 87.00

    Precisely engineered accessories can add even more reliability, convenience and flexibility to Rinnai Tankless Water Heaters. With Rinnai Common Ve...

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    $ 87.00 - $ 87.00
    $ 87.00
    $ 87.00 - $ 87.00
    $ 87.00
    Sold out

  • Rinnai - 229205NPP - Condensing 2/4 45 Degree Elbow (2 Pack) for Tankless Water Heaters 229205NPP

    Rinnai
    $ 50.75 - $ 50.75
    $ 50.75
    $ 50.75 - $ 50.75
    $ 50.75

    For use with Sensei Se+ tankless water heaters (condensing) and m-series boilers. Refer to the Rinnai Water Heater Installation and Operation man...

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    $ 50.75 - $ 50.75
    $ 50.75
    $ 50.75 - $ 50.75
    $ 50.75
  • Sold out

    Rheem - RTG-84DVLP-3 - Mid Efficiency RTG-84DVLP-1 Direct Vent Indoor Propane Tankless Water Heater

    Rheem
    $ 953.00 - $ 953.00
    $ 953.00
    $ 953.00 - $ 953.00
    $ 953.00

    Spec Sheet Mid Efficiency 8.4 GPM Indoor Propane Gas EcoNet Included Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a series ...

    View full details
    $ 953.00 - $ 953.00
    $ 953.00
    $ 953.00 - $ 953.00
    $ 953.00
    Sold out

  • Rheem - RTG20270B- 12" Pipe length for RTG-64DVL, RTG-84DVL, RTG-95DVL Tankless Models

    Rheem
    $ 44.99 - $ 44.99
    $ 44.99
    $ 44.99 - $ 44.99
    $ 44.99

    12" Pipe length for Tankless Models: RTG-64DVL RTG-84DVL RTG-95DVL For 3 in. / 5 in. Concentric Tankless Venting

    $ 44.99 - $ 44.99
    $ 44.99
    $ 44.99 - $ 44.99
    $ 44.99

  • Rheem - RTG20270C- 24" Pipe length for RTG-64DVL, RTG-84DVL, RTG-95DVL Tankless Models

    Rheem
    $ 55.99 - $ 55.99
    $ 55.99
    $ 55.99 - $ 55.99
    $ 55.99

    24" Pipe length for Tankless Models: RTG-64DVL RTG-84DVL RTG-95DVL 23.66 in. overall length For 3 in. / 5 in. Concentric Tankless Venting

    $ 55.99 - $ 55.99
    $ 55.99
    $ 55.99 - $ 55.99
    $ 55.99

  • Rinnai RX160iN Sensei RX Series Indoor/Outdoor Natural Gas/Propane Tankless Water Heater

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,442.70
    $ 1,442.70 - $ 1,442.70
    $ 1,442.70

    Rinnai Sensei RX160iN Natural Gas/Propane Tankless Water Heater Rinnai RX160iN Tankless Water Heater features Adaptive Gas Valve Technology that al...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,442.70
    $ 1,442.70 - $ 1,442.70
    $ 1,442.70

  • Rinnai RE140iP Propane Indoor High Efficiency Non Condensing Tankless Water Heater

    Rinnai
    $ 795.69 - $ 795.69
    $ 795.69
    $ 795.69 - $ 795.69
    $ 795.69

    Rinnai RE140iP Indoor Tankless Water Heater The Rinnai RE140iP  High Efficiency Tankless Water Heater is the ideal indoor solution for homeowners s...

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    $ 795.69 - $ 795.69
    $ 795.69
    $ 795.69 - $ 795.69
    $ 795.69

  • Rinnai V53DeN V Series High Efficiency Tankless Water Heater

    Rinnai
    $ 667.49 - $ 667.49
    $ 667.49
    $ 667.49 - $ 667.49
    $ 667.49

    Rinnai V53DeN High Efficiency Water Heater Experience the perfect combination of efficiency and value with the Rinnai V53DeN Non-Condensing Tankles...

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    $ 667.49 - $ 667.49
    $ 667.49
    $ 667.49 - $ 667.49
    $ 667.49

  • Rinnai - 710342 - 3/5 Rubber Wall Plate White

    Rinnai
    $ 9.00 - $ 9.00
    $ 9.00
    $ 9.00 - $ 9.00
    $ 9.00

    Rubber Wall Plate (White) Wall Plate for Rinnai's unique Ubbink concentric venting system provides ease of installation. Compatible with all indoo...

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    $ 9.00 - $ 9.00
    $ 9.00
    $ 9.00 - $ 9.00
    $ 9.00

  • Rheem - RTG20006DW - Main Control

    Rheem
    $ 74.06 - $ 74.06
    $ 74.06
    $ 74.06 - $ 74.06
    $ 74.06

    The Rheem RTG20006DW is a remote control (UMC-117). HVAC replacement part Rheem RTG20006DW. Get your system working properly once again with replac...

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    $ 74.06 - $ 74.06
    $ 74.06
    $ 74.06 - $ 74.06
    $ 74.06
  • Sold out

    Rheem - RTG20040 - EZ-Link 6-ft. Long Cable with Connectors and Wire Support Clamps

    Rheem
    $ 28.25 - $ 28.25
    $ 28.25
    $ 28.25 - $ 28.25
    $ 28.25

    EZ-Link™ Cable 6-ft. Long Cable with Connectors and Wire Support Clamps Connect two tankless water heaters together in a manifold. This will allow...

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    $ 28.25 - $ 28.25
    $ 28.25
    $ 28.25 - $ 28.25
    $ 28.25
    Sold out

  • Rinnai - 242141 - Flashing for Metal Roof - Plastic

    Rinnai
    $ 108.98 - $ 108.98
    $ 108.98
    $ 108.98 - $ 108.98
    $ 108.98

    Flashing for Metal Roof For metal roof installations. Zero clearance to combustibles. Material: Plastic UPC: 8713645120461 Height: 2.5" Width...

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    $ 108.98 - $ 108.98
    $ 108.98
    $ 108.98 - $ 108.98
    $ 108.98

  • Rinnai RXP160IN Sensei RX Condensing Recirculating Pro Series Indoor with Pump Natural Gas/Propane

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,685.60
    $ 1,685.60 - $ 1,685.60
    $ 1,685.60

    Rinnai RXP160iN – Sensei RX Series Indoor Tankless Water Heater The Rinnai RXP160iN is built for homeowners who want dependable performance, intell...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,685.60
    $ 1,685.60 - $ 1,685.60
    $ 1,685.60

  • Rinnai RX180iN Sensei Indoor/Outdoor Tankless Water Heater Natural Gas/Propane

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,566.60
    $ 1,566.60 - $ 1,566.60
    $ 1,566.60

    Rinnai RX180iN – Sensei RX Series Indoor Tankless Water Heater The Rinnai RX180iN delivers powerful, efficient hot water performance for medium-to...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,566.60
    $ 1,566.60 - $ 1,566.60
    $ 1,566.60

  • Rinnai RE199iN Natural Gas High Efficiency Non Condensing Tankless Water Heater

    Rinnai
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79

    Rinnai RE199iN Natural Gas Tankless Water Heater Never run out of hot water again with the Rinnai RE199iN natural gas non-condensing tankless water...

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    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
  • EWS Heater Guard 1.5 inch sediment and scale protection system

    EWS Heater Guard 1.5? – Sediment & Scale Protection for Larger Water Heaters

    EWS
    $ 492.75 - $ 492.75
    $ 492.75
    $ 492.75 - $ 492.75
    $ 492.75

    EWS Heater Guard 1.5? – Sediment & Scale Protection for Water Heaters The EWS Heater Guard 1.5? is a rugged inline protection unit designed for...

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    $ 492.75 - $ 492.75
    $ 492.75
    $ 492.75 - $ 492.75
    $ 492.75

  • Rheem - RTG20321- Concentric 45 Degree elbow for RTG-64DVL, RTG-84DVL, RTG-95DVL Tankless Models

    Rheem
    $ 85.99 - $ 85.99
    $ 85.99
    $ 85.99 - $ 85.99
    $ 85.99

    Stainless Steel Concentric 45° elbow for use with a mid efficiency tankless gas unit installation. Perfect for making offsets in the vent run from ...

    View full details
    $ 85.99 - $ 85.99
    $ 85.99
    $ 85.99 - $ 85.99
    $ 85.99

  • Rheem - RTG-84DVLN-3 - Mid Efficiency 8.4 GPM Indoor Natural Gas EcoNet Enabled Tankless Water Heater

    Rheem
    $ 953.00 - $ 953.00
    $ 953.00
    $ 953.00 - $ 953.00
    $ 953.00

    Spec Sheet Mid Efficiency 8.4 GPM Indoor Natural Gas EcoNet Included Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a series ...

    View full details
    $ 953.00 - $ 953.00
    $ 953.00
    $ 953.00 - $ 953.00
    $ 953.00
  • Sold out

    Rheem - RTG-95XLN-3 - Mid Efficiency 9.5 GPM Outdoor Natural Gas EcoNet Enabled Tankless Water Heater

    Rheem
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00

    Spec Sheet Mid Efficiency 9.5 GPM Outdoor Natural Gas EcoNet Enabled Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a series ...

    View full details
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    Sold out
  • Sold out

    Rinnai CX199iN SENSEI Commercial Condensing Indoor/Outdoor Tankless Water Heater 199000 BTU

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,752.80
    $ 1,752.80 - $ 1,752.80
    $ 1,752.80

    Rinnai CX199iN SENSEI Commercial Indoor/Outdoor Tankless Water Heater For commercial spaces demanding peak performance and efficiency, the Rinnai C...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,752.80
    $ 1,752.80 - $ 1,752.80
    $ 1,752.80
    Sold out
  • Sold out

    Rheem - RTG-95XLP-3 - Mid Efficiency 9.5 GPM Outdoor Propane EcoNet Enabled Tankless Water Heater

    Rheem
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00

    Spec Sheet Mid Efficiency 9.5 GPM Outdoor Propane EcoNet Enabled Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a series of u...

    View full details
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    $ 1,243.00 - $ 1,243.00
    $ 1,243.00
    Sold out
  • Sold out

    Rheem - RTG-70XLN-3 - Mid Efficiency 70 Direct Vent Outdoor Natural Gas EcoNet Enabled Tankless Water Heater

    Rheem
    $ 819.75 - $ 819.75
    $ 819.75
    $ 819.75 - $ 819.75
    $ 819.75

    Spec Sheet Mid Efficiency 70 Direct Vent Outdoor Natural Gas EcoNet Enabled Tankless Water Heater with 12 Year Limited Warranty   Rheem RTG is a ...

    View full details
    $ 819.75 - $ 819.75
    $ 819.75
    $ 819.75 - $ 819.75
    $ 819.75
    Sold out

Pro tips: Size from the coldest inlet temperature, verify gas line and meter capacity (or electrical service for electric units), and map the vent path before mounting. Neutralize condensate on condensing models, install isolation valves for easy flushing, and follow local code for gas/electrical and combustion air. Not sure which unit or kit fits? Tell us fuel type, location, and demand—we’ll build a dialed-in list.

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