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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 REP199eN High Efficiency Outdoor Non Condensing Tankless Water Heater With Recirculation Pump

    Rinnai
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

    Rinnai REP199eN Outdoor Tankless Water Heater With Recirculation Pump Enjoy an endless supply of hot water with the Rinnai REP199eN tankless water ...

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    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

  • Rinnai - REP160iP - REP Model Series High Efficiency Non Condensing includes a built-in recirculation pump.

    Rinnai
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

    Spec Sheet Install Manual Learn More REP160iP is the perfect combination of high efficiency, comfort and value in a propane gas tankless water heat...

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    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

  • Rinnai REP199iN High Efficiency Non Condensing Indoor Tankless Water Heater With Built-in Recirculation Pump

    Rinnai
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

    Rinnai REP199iN High Efficiency Tankless Water Heater With Recirculation Pump The Rinnai REP199iN High-Efficiency Tankless Water Heater delivers ma...

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    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

  • Rinnai RE180iN Natural Gas High Efficiency Non Condensing Tankless Water Heater

    Rinnai
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16

    Rinnai RE180iN Indoor Non Condensing Tankless Water Heater Enjoy endless hot water and exceptional efficiency with the Rinnai RE180iN natural gas t...

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    $ 1,091.16 - $ 1,091.16
    $ 1,091.16
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16
  • Rinnai - Rinnai Horizontal Termination Diverter Kit 21" 223187 - - Water Heater Venting - Big Frog Supply
    Sold out

    Rinnai - 223187 - Horizontal Termination Diverter Kit 21"

    Rinnai
    $ 117.00 - $ 117.00
    $ 117.00
    $ 117.00 - $ 117.00
    $ 117.00

    Raised termination kit for Rinnai tankless water heater venting in the shape of an L to go outside of side wall. Inner exhaust material is aluminum...

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    $ 117.00 - $ 117.00
    $ 117.00
    $ 117.00 - $ 117.00
    $ 117.00
    Sold out
  • Rinnai - Rinnai Metal Pass Through Venting Plate 224097 - - Water Heater Venting - Big Frog Supply
    Sold out

    Rinnai - 224097 - Metal Pass Through Venting Plate

    Rinnai
    $ 32.50 - $ 32.50
    $ 32.50
    $ 32.50 - $ 32.50
    $ 32.50

    Rinnai has the best metal pass through plate for your venting needs. The Rinnai 224097 is suitable for use with plastic and metal components. Actua...

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    $ 32.50 - $ 32.50
    $ 32.50
    $ 32.50 - $ 32.50
    $ 32.50
    Sold out

  • Rinnai - RE160iP - RE Model Series High Efficiency Non Condensing (Replaces model V65)

    Rinnai
    $ 893.34 - $ 893.34
    $ 893.34
    $ 893.34 - $ 893.34
    $ 893.34

    Spec Sheet Install Manual Learn More RE160iP is the perfect combination of high efficiency, comfort and value in a Propane gas non- condensing ta...

    View full details
    $ 893.34 - $ 893.34
    $ 893.34
    $ 893.34 - $ 893.34
    $ 893.34

  • Rinnai RE199eN — 9.8 GPM Non-Condensing Natural Gas Tankless Water Heater (199,000 BTU)

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79

    Rinnai RE199eN — Natural Gas Non-Condensing Tankless Water Heater The Rinnai RE199eN brings high-capacity on-demand hot water using natural gas. En...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
  • Sold out

    Rinnai - 790146 - Check Valve PPTL to PVC Direct Vent

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 212.19
    $ 212.19 - $ 212.19
    $ 212.19

    PVC AND CPVC COMMON VENTING IN 3" AND 4" SIZING INCREASES SAVINGS AND FLEXIBILITY AVAILABLE WITH RINNAI INLINE TANKLESS RACK SYSTEMS (TRS) AND CORN...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 212.19
    $ 212.19 - $ 212.19
    $ 212.19
    Sold out

  • Rheem - SP20286 - Horizontal Vent Termination Kit 3 In.

    Rheem
    $ 30.88 - $ 30.88
    $ 30.88
    $ 30.88 - $ 30.88
    $ 30.88

    Rheem SP20286 3" Low Profile Horizontal Termination Kit 3" Low Profile Horizontal Termination. 3 in. horizontal vent termination kit for high effi...

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    $ 30.88 - $ 30.88
    $ 30.88
    $ 30.88 - $ 30.88
    $ 30.88
  • Rinnai - Rinnai All-Weather Wall Discharge 223159 - - Water Heater Venting - Big Frog Supply

    Rinnai - 223159 - All-Weather Wall Discharge

    Rinnai
    $ 79.99 - $ 79.99
    $ 79.99
    $ 79.99 - $ 79.99
    $ 79.99

    Rinnai's all-weather wall discharge 223159. Product color may vary from displayed image.

    $ 79.99 - $ 79.99
    $ 79.99
    $ 79.99 - $ 79.99
    $ 79.99

  • Rinnai -RX130iN- Sensei RX Condensing Series Pro Build Indoor without Pump Natural Gas/Propane

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,264.20
    $ 1,264.20 - $ 1,264.20
    $ 1,264.20

    Rinnai introduces its Adaptive Gas Valve Technology in the Sensei RX Pro Built Series  Rinnai introduces their Pro Build RX Series Tankless Water H...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,264.20
    $ 1,264.20 - $ 1,264.20
    $ 1,264.20

  • Rinnai REP199eP High Efficiency Non Condensing Propane Tankless Water Heater With Built-in Recirculation Pump

    Rinnai
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

    Rinnai REP199eP Outdoor Tankless Water Heater With Recirculation Pump For professional installers and homeowners seeking the perfect mix of value a...

    View full details
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59
    $ 1,381.59 - $ 1,381.59
    $ 1,381.59

  • Rinnai - REP160iN - REP Model Series High Efficiency Non Condensing includes a built-in recirculation pump.

    Rinnai
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

    Spec Sheet Install Manual Learn More REP160iN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing tan...

    View full details
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

  • Rinnai REP160eP High Efficiency Non Condensing Tankless Water Heater With Built-in Recirculation Pump.

    Rinnai
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

    Rinnai REP160eP High Efficiency Water Heater With Recirculation Pump Get reliable, continuous hot water for your home right where you need it with ...

    View full details
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19
    $ 1,016.19 - $ 1,016.19
    $ 1,016.19

  • Rinnai RE140eP High Efficiency Non Condensing Outdoor Propane Tankless Water Heater

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

    Rinnai RE140eP Outdoor Propane Tankless Water Heater The Rinnai RE140eP Tankless Water Heater offers a compact, high-efficiency (0.81 UEF) solution...

    View full details
    $ 795.69 - $ 795.69
    $ 795.69
    $ 795.69 - $ 795.69
    $ 795.69

  • Rinnai RE140eN High Efficiency Non Condensing Outdoor Natural Gass Tankless Water Heater

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

    Rinnai RE140eN High Efficiency Outdoor Tankless Water Heater The Rinnai RE140eN Natural Gas Tankless Water Heater  is the perfect combination of hi...

    View full details
    $ 795.69 - $ 795.69
    $ 795.69
    $ 795.69 - $ 795.69
    $ 795.69

  • Rinnai - RE199iP - RE Model Series High Efficiency Non Condensing (Replaces model V94 and RL94)

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

    Spec Sheet Install Manual Learn More RE199iP is the perfect combination of high efficiency, comfort and value in a Propane gas non- condensing ta...

    View full details
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79

  • Rinnai RE180iP High Efficiency Non Condensing Indoor Propane Tankless Water Heater

    Rinnai
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16

    Rinnai RE180iP Indoor Propane Tankless Water Heater The Rinnai RE180iP Tankless Water Heater is your high-efficiency, space-saving solution for end...

    View full details
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16
    $ 1,091.16 - $ 1,091.16
    $ 1,091.16

  • Rinnai - RE160iN - RE Model Series High Efficiency Non Condensing (Replaces model V65)

    Rinnai
    $ 893.34 - $ 893.34
    $ 893.34
    $ 893.34 - $ 893.34
    $ 893.34

    Spec Sheet Install Manual Learn More RE160iN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing ta...

    View full details
    $ 893.34 - $ 893.34
    $ 893.34
    $ 893.34 - $ 893.34
    $ 893.34

  • Rinnai RE199eP — 9.8 GPM Propane Outdoor Tankless Water Heater (199,000 BTU)

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79

    Rinnai RE199eP — 9.8 GPM Propane Outdoor Non-Condensing Tankless Heater The Rinnai RE199eP is a high-capacity, non-condensing propane tankless wate...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,280.79
    $ 1,280.79 - $ 1,280.79
    $ 1,280.79
  • Sold out

    Rheem - SP14410 - Piezo Ignitor and Bracket

    Rheem
    $ 3.84 - $ 3.84
    $ 3.84
    $ 3.84 - $ 3.84
    $ 3.84

    The Rheem Piezo Ignitor replacement kit is designed to work on select Rheem gas water heaters. The ignitor allows for a properly functioning gas wa...

    View full details
    $ 3.84 - $ 3.84
    $ 3.84
    $ 3.84 - $ 3.84
    $ 3.84
    Sold out
  • Sold out

    Rheem - SP13845A - Thermostat 1/2" Natural Gas Valve (120V)

    Rheem
    $ 169.50 - $ 169.50
    $ 169.50
    $ 169.50 - $ 169.50
    $ 169.50

    The Rheem PROTECH Gas Control Replacement Kit contains everything that you need to replace the Gas Valve on your Rheem gas water heater. The part i...

    View full details
    $ 169.50 - $ 169.50
    $ 169.50
    $ 169.50 - $ 169.50
    $ 169.50
    Sold out
  • Sold out

    Rheem - SP10869PH - Screw-In 240-Volt by 5500-Watt Element Premium Resistored Stainless Steel

    Rheem
    $ 24.93 - $ 24.93
    $ 24.93
    $ 24.93 - $ 24.93
    $ 24.93

    Rheem PROTECH screw-in water heater elements feature true OEM performance. These are the same elements that are used in the production of every Rhe...

    View full details
    $ 24.93 - $ 24.93
    $ 24.93
    $ 24.93 - $ 24.93
    $ 24.93
    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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