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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.


  •

    Rinnai Pipe Cover PCD11-SHS fits Sensei RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 231.00
    $ 231.00 - $ 231.00
    $ 231.00

    Rinnai Sensei RX Pipe Cover Give your tankless water heater installation a clean, finished look with the Rinnai PCD11-SHS Pipe Cover Enclosure. Thi...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 231.00
    $ 231.00 - $ 231.00
    $ 231.00
  • Rinnai - Rinnai Vent Pipe Extension 10" for Condensing Units 224087PP - - Water Heater Venting - Big Frog Supply

    Rinnai - 224087PP - 10" Metal Pass Through Condensing Venting Plate

    Rinnai
    $ 39.00 - $ 39.00
    $ 39.00
    $ 39.00 - $ 39.00
    $ 39.00

    Rinnai's 10 inch vent pipe extension helps route venting for your Rinnai tankless water heater. The 224087PP pipe is made specifically for Condensi...

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    $ 39.00 - $ 39.00
    $ 39.00
    $ 39.00 - $ 39.00
    $ 39.00
  • Rinnai - Rinnai 90 Degree Vent Pipe Elbow for Condensing Units 224078PP - - Water Heater Venting - Big Frog Supply

    Rinnai - 224078PP - 90 Degree Vent Pipe Elbow for Condensing Units

    Rinnai
    $ 44.00 - $ 44.00
    $ 44.00
    $ 44.00 - $ 44.00
    $ 44.00

    Rinnai's 90 degree elbow vent pipe helps route venting for your Rinnai tankless water heater. The 224078PP pipe is made specifically for Condensing...

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    $ 44.00 - $ 44.00
    $ 44.00
    $ 44.00 - $ 44.00
    $ 44.00

  • Rinnai - CVENT2 - DiversiTech Concentric 2" Vent Termination

    Rinnai
    $ 50.02 - $ 50.02
    $ 50.02
    $ 50.02 - $ 50.02
    $ 50.02

    DiversiTech 2 Inch Concentric Vent Termination The DiversiTech Concentric 2" Vent makes it easier to have a two-pipe installation for high efficien...

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    $ 50.02 - $ 50.02
    $ 50.02
    $ 50.02 - $ 50.02
    $ 50.02

  • Rinnai - REU-EZC-2 - EZConnect Cable works with Sensei

    Rinnai
    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

    Electronically connects two units so they function as one hot water source. Updated wire works with the Sensei group of water heaters and Pre Sens...

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    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00
  • Rinnai - Rinnai 45 Degree Vent Pipe Elbow for CONDENSING Units 224077PP - - Water Heater Venting - Big Frog Supply

    Rinnai - 224077PP - 45 Degree Vent Pipe Elbow for CONDENSING Units

    Rinnai
    $ 61.00 - $ 61.00
    $ 61.00
    $ 61.00 - $ 61.00
    $ 61.00

    Rinnai's 45 degree elbow vent pipe helps route venting for your Rinnai tankless water heater. This 224077PP pipe is made specifically for Condensin...

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    $ 61.00 - $ 61.00
    $ 61.00
    $ 61.00 - $ 61.00
    $ 61.00
  • Rinnai - Rinnai Shingle Roof Flashing (6/12 to 12/12 pitch) 189951 - - Water Heater Venting - Big Frog Supply
    Sold out

    Rinnai - 189951 - Shingle Roof Flashing (6/12 to 12/12 pitch)

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

    Rinnai shingle roof flashing that is made of high quality plastic. It's meant for 6/12 to 12/12 pitch. SKU: 189951 Actual product's color may vary ...

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

  • Rinnai 804000074 Condensate Neutralizer Kit

    Rinnai
    $ 151.05 - $ 151.05
    $ 151.05
    $ 151.05 - $ 151.05
    $ 151.05

    Rinnai Condensate Neutralizer Kit The Rinnai 804000074 Condensate Neutralizer Kit is designed to provide reliable and efficient performance, design...

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    $ 151.05 - $ 151.05
    $ 151.05
    $ 151.05 - $ 151.05
    $ 151.05

  • Rinnai - MCC-601-W - Commercial Temp Controller - White

    Rinnai
    $ 178.34 - $ 178.34
    $ 178.34
    $ 178.34 - $ 178.34
    $ 178.34

    The MCC-601-W is made from premium materials, this Item offers great function and value for your home. This fixture is part of Rinnai's decorativ...

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    $ 178.34 - $ 178.34
    $ 178.34
    $ 178.34 - $ 178.34
    $ 178.34

  • Rinnai - V53DeP - V Model Series High Efficiency Tankless Water Heater by Rinnai

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

    Rinnai V53DeP Propane Tankless Water Heater The Rinnai V53DEP High Efficiency Outdoor Tankless Heater delivers the perfect blend of continuous hot ...

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    $ 667.49 - $ 667.49
    $ 667.49
    $ 667.49 - $ 667.49
    $ 667.49
  • Rinnai - Rinnai Condensate Trap 222053 - - Water Heater Venting - Big Frog Supply
    Sold out

    Rinnai - 222053 - Condensate Trap

    Rinnai
    $ 61.00 - $ 61.00
    $ 61.00
    $ 61.00 - $ 61.00
    $ 61.00

    Rinnai has made the best condensating trap for their line of tankless water heaters. The 222053 condesate trap works with all plastic and metal com...

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    $ 61.00 - $ 61.00
    $ 61.00
    $ 61.00 - $ 61.00
    $ 61.00
    Sold out
  • Rinnai - Rinnai 18" Roof Discharge Terminal 184118S - - Water Heater Venting - Big Frog Supply

    Rinnai - 184118S - 18" (above roof) Roof Discharge Terminal

    Rinnai
    $ 115.00 - $ 115.00
    $ 115.00
    $ 115.00 - $ 115.00
    $ 115.00

    Rinnai roof discharge 18" for non-condensing ultra series tankless water heaters. SKU: 184118S Color of product may differ from image. This ventin...

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    $ 115.00 - $ 115.00
    $ 115.00
    $ 115.00 - $ 115.00
    $ 115.00
  • Rinnai - Rinnai 90 Degree Elbow 224063 - - Water Heater Venting - Big Frog Supply

    Rinnai - 224063 - 90 Degree Elbow

    Rinnai
    $ 63.00 - $ 63.00
    $ 63.00
    $ 63.00 - $ 63.00
    $ 63.00

    This 90 degree elbow is for non-condensing (luxury and value series) Rinnai tankless water heaters. Rinnai 224063. Product color may differ from im...

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    $ 63.00 - $ 63.00
    $ 63.00
    $ 63.00 - $ 63.00
    $ 63.00
  • Rinnai - Rinnai Vent Pipe Extension 19.5" 224052 - - Water Heater Venting - Big Frog Supply

    Rinnai - 224052 - Vent Pipe Extension 19.5"

    Rinnai
    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

    19.5" vent pipe extension for your Rinnai tankless water heater venting. Inner exhaust material is aluminum and outer intake material is plastic. ...

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    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

  • Rinnai - CVENT3 - DiversiTech Concentric 3" Vent Termination

    Rinnai
    $ 49.58 - $ 49.58
    $ 49.58
    $ 49.58 - $ 49.58
    $ 49.58

    Concentric 3" Vent Termination  The DiversiTech 3-inch Concentric Vent Kit is the solution for simplifying high-efficiency furnace installations. T...

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    $ 49.58 - $ 49.58
    $ 49.58
    $ 49.58 - $ 49.58
    $ 49.58

  • Rinnai - 224356NPP - 2inch / 4 inch Condensing Roof Discharge Termination 20 in. Above Roof

    Rinnai
    $ 68.70 - $ 68.70
    $ 68.70
    $ 68.70 - $ 68.70
    $ 68.70

    For use with the following models: RU199i RU180i RU160i RU130i RUR199i RUR160i CU199i CU160i Material of Inner/Exhaust - Polypropylene Mater...

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    $ 68.70 - $ 68.70
    $ 68.70
    $ 68.70 - $ 68.70
    $ 68.70
  • Rinnai - Rinnai 45 Degree Elbows For Venting NON CONDENSING (2 Pack) 224050 - - Water Heater Venting - Big Frog Supply

    Rinnai - 224050 - 45 Degree Elbows For Venting NON CONDENSING (2 Pack)

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

    45 degree elbows for your Rinnai tankless water heater venting. Inner exhaust material is aluminum and outer intake material is plastic. Part Numb...

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    $ 87.00 - $ 87.00
    $ 87.00
    $ 87.00 - $ 87.00
    $ 87.00
  • Rinnai - EZ Connect Cord for LS units - - Water Heater Controllers - Big Frog Supply
    Sold out

    Rinnai - REU-EZC-1US - EZ Connect Cord for Rinnai units

    Rinnai
    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

    EZ Connect Cord for multiple connecting Rinnai units together.

    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00
    Sold out
  • Sold out

    Rinnai V75iN Natural Gas Tankless Water Heater, 7.5 Gallons Per Minute , While supplies last (Replaced by RE180)

    Rinnai
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99

    Spec Sheet  Install Manual Current RL and 4 of the V models will be discontinued and replaced with the New RE•SERIES™ Non-Condensing models includ...

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    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    Sold out

  • Rinnai - 229310NPP - 2inch / 4 inch Condensing Vent Pipe Extension, 39 Inches

    Rinnai
    $ 49.99 - $ 49.99
    $ 49.99
    $ 49.99 - $ 49.99
    $ 49.99

    For use with the following models: RU199i RU180i RU160i RU130i RUR199i RUR160i CU199i CU160i Material of Inner/Exhaust - Polypropylene Mater...

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    $ 49.99 - $ 49.99
    $ 49.99
    $ 49.99 - $ 49.99
    $ 49.99

  • Rinnai - RWMKT03 - Control-R Wireless Demand Recirculation Kit (Push Button+Temp Sensor)

    Rinnai
    $ 559.00 - $ 559.00
    $ 559.00
    $ 559.00 - $ 559.00
    $ 559.00

    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-Button ...

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    $ 559.00 - $ 559.00
    $ 559.00
    $ 559.00 - $ 559.00
    $ 559.00

  • Rinnai SENSEI RSC160iN RSC Series Super High Efficiency Plus - Natural Gas Water Heater

    Rinnai
    $ 1,369.62 - $ 1,369.62
    $ 1,369.62
    $ 1,369.62 - $ 1,369.62
    $ 1,369.62

    Rinnai SENSEI RSC160iN Super High Efficiency Natural Gas Water Heater Experience the ultimate in hot water performance with the Rinnai RSC160iN Sup...

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    $ 1,369.62 - $ 1,369.62
    $ 1,369.62
    $ 1,369.62 - $ 1,369.62
    $ 1,369.62

  • Rinnai - 229308NPP - 2 in. / 4 in. x 10 in. Plastic Condensing Vent Pipe Extension Kit

    Rinnai
    $ 33.79 - $ 33.79
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79

    Concentric venting allows for secure connection 2 in. / 4 in. condensing vent pipe extension 10 in For use with Sensei Se+ tankless water heaters ...

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    $ 33.79 - $ 33.79
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79

  • Rinnai - 229309NPP - 2 in. / 4 in. x 19.5in. Plastic Condensing Vent Pipe Extension Kit

    Rinnai
    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99

    Concentric venting allows for secure connection 2 in. / 4 in. condensing vent pipe extension 19.5 in For use with Sensei Se+ tankless water heater...

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    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99

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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