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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
  •

    Rinnai Outdoor Vent Cap RXOVC for Sensei RX series units

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 49.70
    $ 49.70 - $ 49.70
    $ 49.70

    Rinnai Outdoor Vent Cap The Rinnai Sensei Outdoor Versa-Vent Cap RXOVC is the essential accessory that instantly converts any Rinnai Sensei RX Seri...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 49.70
    $ 49.70 - $ 49.70
    $ 49.70

  • Rinnai EZ-connect Cable for RX Units

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 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 RX group of water heaters. RX130 RX160 RX18...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

  • Rinnai RX199iN Sensei Condensing Indoor/Outdoor Natural Gas/Propane Tankless Water Heater

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,532.79
    $ 1,532.79 - $ 1,532.79
    $ 1,532.79

    Rinnai Sensei RX199iN Indoor/Outdoor Tankless Water Heater Rinnai introduces their Pro Build RX Series Tankless Water Heaters, featuring Adaptive G...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,532.79
    $ 1,532.79 - $ 1,532.79
    $ 1,532.79
  • Sold out

    Rinnai 2/4" Condensing 45-degree Elbow (2 Pack) (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 37.06
    $ 37.06 - $ 37.06
    $ 37.06

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience. 2/4 in. (60/100) Ubbink Vent Compon...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 37.06
    $ 37.06 - $ 37.06
    $ 37.06
    Sold out
  • Sold out

    Rinnai 185348NPP - 2"/4" Condensing Roof Terminal Extension Kit

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 77.00
    $ 77.00 - $ 77.00
    $ 77.00

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience. FEATURES & BENEFITS Compa...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 77.00
    $ 77.00 - $ 77.00
    $ 77.00
    Sold out
  • Sold out

    Rinnai 229233 - 2/4" Condensing 90-degree Elbow (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 25.92
    $ 25.92 - $ 25.92
    $ 25.92

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience. 2/4 in. (60/100) Ubbink Vent Compon...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 25.92
    $ 25.92 - $ 25.92
    $ 25.92
    Sold out
  • Sold out

    Rinnai 229252 - 2/4" Condensing Horizontal Starter Adapter (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 27.76
    $ 27.76 - $ 27.76
    $ 27.76

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience. 2/4 in. (60/100) Ubbink Vent Compon...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 27.76
    $ 27.76 - $ 27.76
    $ 27.76
    Sold out

  • Rinnai Sensei RXP199i Condensing Indoor/Outdoor Tankless Water Heater with Recirculating Pump Natural Gas/Propane

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,861.02
    $ 1,861.02 - $ 1,861.02
    $ 1,861.02

    Rinnai RxP199i Condensing Indoor/Outdoor Tankless Water Heater Say goodbye to running out of hot water with the Rinnai SENSEI RXP199iN Tankless Wat...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 1,861.02
    $ 1,861.02 - $ 1,861.02
    $ 1,861.02
  • Diagram of a heating system with labeled components and step-by-step process on a white background.
    Eemax water heater on a white background

    Eemax HomeAdvantage II HA011240 Tankless Electric Water Heater | 11kW 240V

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 270.04
    $ 270.04 - $ 270.04
    $ 270.04

    Eemax HomeAdvantage II HA011240 Tankless Electric Water Heater Brand: Eemax SKU: HA011240 Product Details The Eemax HA011240 HomeAdvantage II...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 270.04
    $ 270.04 - $ 270.04
    $ 270.04

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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