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Tankless Water Heaters

Tankless water heaters deliver endless hot water with compact, energy-smart designs. Shop gas (natural gas or LP) and electric models from Rinnai, Rheem, Stiebel Eltron, Eemax, and Chronomite—plus venting, recirculation, controls, and repair parts to finish the job.

Shop by need

  • Fuel & power: Natural Gas and Propane; Electric 120V or 240V point-of-use and whole-home
  • Model type: Condensing and Non-condensing; Indoor or Outdoor; Combination units
  • Recirculation: built-in recirc pump models, add-on pumps, pump hardware, controllers, and WiFi control accessories
  • Venting: concentric and twin-pipe kits, terminations, pipe covers, and heater guards
  • Kits & parts: NG/LP conversion kits, descaler/flush kits, repair parts, cables, and accessories
  • Series callouts: Rinnai Sensei CX and Sensei RX series options
  • Sold out

    Rinnai - M090SN - M-Series Heat Only 90,000 BTU Condensing Boiler

    Rinnai
    $ 1,338.54 - $ 1,338.54
    $ 1,338.54
    $ 1,338.54 - $ 1,338.54
    $ 1,338.54

    Why the "M" Series? For maximum momentum. Using proven technology, these boilers are designed to keep your day going and your family happy. Stand...

    View full details
    $ 1,338.54 - $ 1,338.54
    $ 1,338.54
    $ 1,338.54 - $ 1,338.54
    $ 1,338.54
    Sold out
  • Sold out

    Rinnai - M060SN - M-Series Heat Only 60,000 BTU Condensing Boiler

    Rinnai
    $ 1,181.70 - $ 1,181.70
    $ 1,181.70
    $ 1,181.70 - $ 1,181.70
    $ 1,181.70

    Why the "M" Series? For maximum momentum. Using proven technology, these boilers are designed to keep your day going and your family happy. Stand...

    View full details
    $ 1,181.70 - $ 1,181.70
    $ 1,181.70
    $ 1,181.70 - $ 1,181.70
    $ 1,181.70
    Sold out
  • Sold out

    Rinnai - M060CN - M-Series Domestic Hot Water 5.1 GPH 60,000BTU Combi Condensing Boiler

    Rinnai
    $ 1,346.49 - $ 1,346.49
    $ 1,346.49
    $ 1,346.49 - $ 1,346.49
    $ 1,346.49

    Why the "M" Series? For maximum momentum. Using proven technology, these boilers are designed to keep your day going and your family happy. Stand...

    View full details
    $ 1,346.49 - $ 1,346.49
    $ 1,346.49
    $ 1,346.49 - $ 1,346.49
    $ 1,346.49
    Sold out
  • Sold out

    Rinnai - M160CN - M-Series Domestic Hot Water 8.5 GPH 160,000 BTU Combi Condensing Boiler

    Rinnai
    $ 2,692.76 - $ 2,692.76
    $ 2,692.76
    $ 2,692.76 - $ 2,692.76
    $ 2,692.76

    Why the "M" Series? For maximum momentum. Using proven technology, these boilers are designed to keep your day going and your family happy. Stand...

    View full details
    $ 2,692.76 - $ 2,692.76
    $ 2,692.76
    $ 2,692.76 - $ 2,692.76
    $ 2,692.76
    Sold out
  • Sold out

    Rinnai - M120CN - M-Series Domestic Hot Water 8.5 GPH 120,000 BTU Combi Condensing Boiler

    Rinnai
    $ 2,793.07 - $ 2,793.07
    $ 2,793.07
    $ 2,793.07 - $ 2,793.07
    $ 2,793.07

    Why the "M" Series? For maximum momentum. Using proven technology, these boilers are designed to keep your day going and your family happy. Stand...

    View full details
    $ 2,793.07 - $ 2,793.07
    $ 2,793.07
    $ 2,793.07 - $ 2,793.07
    $ 2,793.07
    Sold out
  • Sold out

    Rinnai - CHS199100iN - Demand Duo Tankless Hybrid Water Heater

    Rinnai
    $ 5,900.00 - $ 5,900.00
    $ 5,900.00
    $ 5,900.00 - $ 5,900.00
    $ 5,900.00

    This unique Commercial Hybrid system combines all the benefits of the Rinnai C199 Condensing Tankless Water Heater with a 119-gallon storage tank a...

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    $ 5,900.00 - $ 5,900.00
    $ 5,900.00
    $ 5,900.00 - $ 5,900.00
    $ 5,900.00
    Sold out
  • Rinnai - Rinnai 21" Universal Non-Cond Horizontal Termination 223184 - - Water Heater Venting - Big Frog Supply

    Rinnai - 223184 - 21" Universal Non-Cond Horizontal Termination

    Rinnai
    $ 84.00 - $ 84.00
    $ 84.00
    $ 84.00 - $ 84.00
    $ 84.00

    Rinnai's 223184 21" universal non-condensing horizontal termination kit is compatible with all Rinnai tankless water heater models except the 98 se...

    View full details
    $ 84.00 - $ 84.00
    $ 84.00
    $ 84.00 - $ 84.00
    $ 84.00
  • 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 - 107000284 - Isolation Valve Kit Next Gen Replacement for Sensei Models

    Rinnai
    $ 99.99 - $ 99.99
    $ 99.99
    $ 99.99 - $ 99.99
    $ 99.99

    Rinnai Isolation Valve Kit Next Gen Replacement for Sensei Models 107000284

    $ 99.99 - $ 99.99
    $ 99.99
    $ 99.99 - $ 99.99
    $ 99.99
  • Sold out

    Rinnai - PCD07-SM - Pipe Cover Enclosure Bottom Plate for Ultra Series

    Rinnai
    $ 58.00 - $ 58.00
    $ 58.00
    $ 58.00 - $ 58.00
    $ 58.00

    Rinnai bottom plate to be used with PCD07-SM to continue covering pipes.

    $ 58.00 - $ 58.00
    $ 58.00
    $ 58.00 - $ 58.00
    $ 58.00
    Sold out

  • 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 - RWMTS01 - Control-R Wi-Fi Temperature Sensor

    Rinnai
    $ 159.95 - $ 159.95
    $ 159.95
    $ 159.95 - $ 159.95
    $ 159.95

    Wireless Temperature Sensor The sensor turns off the recirculation and is available for purchase if required by local building codes.

    $ 159.95 - $ 159.95
    $ 159.95
    $ 159.95 - $ 159.95
    $ 159.95

  • 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

  • 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

  • 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...

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

  • Rinnai REP199iP High Efficiency Non Condensing 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 REP199iP Non Condensing Tankless Water Heater The Rinnai REP199iP Non Condensing Tankless Water Heater delivers the perfect blend of high ef...

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

  • 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 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...

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

  • 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 - Rinnai Universal Horizontal Termination Kit 11.5" 223181 - - Water Heater Venting - Big Frog Supply - 2
    Rinnai - Rinnai Universal Horizontal Termination Kit 11.5" 223181 - - Water Heater Venting - Big Frog Supply - 1
    Sold out

    SCRATCH AND DENT Rinnai Universal Horizontal Termination Kit 11.5" 223181

    Rinnai
    $ 110.00
    $ 110.00 - $ 110.00
    $ 110.00
    $ 85.00
    $ 85.00 - $ 85.00
    $ 85.00

    Item is fairly worn but still functional. Significant signs of cosmetic damage can include scratches, dents, and worn corners. Item may arrive wit...

    View full details
    $ 110.00
    $ 110.00 - $ 110.00
    $ 110.00
    $ 85.00
    $ 85.00 - $ 85.00
    $ 85.00
    Sold out
  • Sold out

    Rinnai Control-R Wi-Fi Push Button RWMPB01

    Rinnai
    $ 60.23 - $ 60.23
    $ 60.23
    $ 60.23 - $ 60.23
    $ 60.23

    Precisely engineered accessories can add even more reliability, convenience and flexibility to Rinnai Tankless Water Heaters.   For Use with the RW...

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    $ 60.23 - $ 60.23
    $ 60.23
    $ 60.23 - $ 60.23
    $ 60.23
    Sold out

  • Rinnai - RE140iN - RE Model Series High Efficiency Non Condensing

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

    Spec Sheet  Install Manual Learn More RE140iN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing tan...

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

Quick choosing guide

  1. Size by flow: estimate peak demand in GPM at your winter inlet temperature rise. Whole-home gas units often cover 5–11+ GPM; electric point-of-use fits sinks and small loads.
  2. Pick fuel & placement: Gas for highest flow; choose indoor with proper venting or outdoor where climate allows. Electric units need the correct amperage and breakers.
  3. Efficiency: select condensing for higher efficiency and cooler exhaust; plan condensate drain where required.
  4. Faster hot water: choose a model with a built-in recirc pump or add a recirc kit and controller.
  5. Complete the install: vent kit and terminations for gas models; isolation/service valves; pipe covers; WiFi or wall controllers. Use NG/LP conversion kits only as specified.
  6. Maintenance: add a descaler/flush kit and schedule periodic cleaning to protect the heat exchanger.

Pro tips: Size for the coldest inlet temperature, verify gas line BTU capacity and vent route for NG/LP models, or breaker/wire size for electric units. Install isolation valves for easy flushing, set recirc schedules to cut wait time, and winterize outdoor units where required.

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