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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
  • White electronic water heater with brass connectors on a white background
    Eemax - EX190TC 19kW Electric Tankless Water Heater - - Mechanical - Big Frog Supply

    Eemax Series Two EX190TC Tankless Electric Water Heater | 19kW 240V Thermostatic

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 622.99
    $ 622.99 - $ 622.99
    $ 622.99

    Eemax Series Two EX190TC Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: EX190TC Product Details The Eemax EX190TC Series Two i...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 622.99
    $ 622.99 - $ 622.99
    $ 622.99
  • Mini tank side profile on white background
    White water heater with Eemax logo on a white background

    Eemax Mini-Tank EMT2.5 Electric Water Heater | 2.5 Gallon 120V

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 181.74
    $ 181.74 - $ 181.74
    $ 181.74

    Eemax Mini-Tank EMT2.5 Point-of-Use Electric Water Heater Brand: Eemax SKU: EMT2.5 Product Details The Eemax EMT2.5 is a versatile, 2.5-gallo...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 181.74
    $ 181.74 - $ 181.74
    $ 181.74
  • Tankless White water heater on white background with flow co on the front
    Tankless White water heater on white background

    Eemax SPEX3012 FlowCo 120V Tankless Electric Water Heater | 3.0kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69

    Eemax SPEX3012 FlowCo Non-Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX3012 Product Details The Eemax SPEX3012 FlowCo is...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69

  • Eemax SPEX2412 FlowCo 120V Tankless Electric Water Heater | 2.4kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 255.99
    $ 255.99 - $ 255.99
    $ 255.99

    Eemax SPEX2412 FlowCo Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX2412 Product Details The Eemax SPEX2412 FlowCo is a p...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 255.99
    $ 255.99 - $ 255.99
    $ 255.99
  • Side View of Tankless auto booster on white background
    A compact Eemax hot water heater booster with a digital user interface, power supply connectors, and branding.
    Sold out

    Eemax AutoBooster HATB007240 Tankless Water Heater Booster | 7.2kW 240V

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 332.00
    $ 332.00 - $ 332.00
    $ 332.00

    Eemax AutoBooster HATB007240 Electric Water Heater Top-Mount Booster Brand: Eemax SKU: HATB007240 Product Details The Eemax AutoBooster HATB0...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 332.00
    $ 332.00 - $ 332.00
    $ 332.00
    Sold out
  • 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 HA018240 Tankless Electric Water Heater | 18kW 240V

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 449.00
    $ 449.00 - $ 449.00
    $ 449.00

    Eemax HomeAdvantage II HA018240 Whole-Home Tankless Electric Water Heater Brand: Eemax SKU: HA018240 Product Details The Eemax HA018240 HomeA...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 449.00
    $ 449.00 - $ 449.00
    $ 449.00
  • Sold out

    Eemax SPEX3512 FlowCo 120V Tankless Electric Water Heater | 3.5kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 196.00
    $ 196.00 - $ 196.00
    $ 196.00

    Eemax SPEX3512 FlowCo Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX3512 Product Details The Eemax SPEX3512 FlowCo is a u...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 196.00
    $ 196.00 - $ 196.00
    $ 196.00
    Sold out
  • Sold out

    Eemax SPEX4208 FlowCo 208V Tankless Electric Water Heater | 4.1kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69

    Eemax SPEX4208 FlowCo Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX4208 Product Details The Eemax SPEX4208 FlowCo is a h...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69
    Sold out

  • Eemax SPEX35 FlowCo 240V Tankless Electric Water Heater | 3.5kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69

    Eemax SPEX35 FlowCo Non-Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX35 Product Details The Eemax SPEX35 FlowCo is an ul...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69
  • Tankless White water heater on white background with flow co on the front
    Tankless White water heater on white background

    Eemax HomeAdvantage II HA011240 Tankless Electric Water Heater | 11kW 240V SPEX75 FlowCo 240V Tankless Electric Water Heater | 7.5kW

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 204.25
    $ 204.25 - $ 204.25
    $ 204.25

    Eemax SPEX75 FlowCo Non-Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX75 Product Details The Eemax SPEX75 FlowCo is a hig...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 204.25
    $ 204.25 - $ 204.25
    $ 204.25
  • White Eemax water heater on a white background
    White water heater with Eemax logo on a white background

    Eemax LavAdvantage SPEX55T Tankless Electric Water Heater | 5.5kW 240V Thermostatic

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 308.43
    $ 308.43 - $ 308.43
    $ 308.43

    Eemax LavAdvantage SPEX55T Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX55T Product Details The Eemax SPEX55T LavAdvanta...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 308.43
    $ 308.43 - $ 308.43
    $ 308.43
  • Tankless White water heater on white background with flow co on the front
    Tankless White water heater on white background

    Eemax SPEX55 FlowCo Tankless Electric Water Heater | 5.5kW 240V Thermostatic

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69

    Eemax SPEX55 FlowCo Thermostatic Tankless Electric Water Heater Brand: Eemax SKU: SPEX55 Product Details The Eemax SPEX55 FlowCo is a high-pe...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 237.69
    $ 237.69 - $ 237.69
    $ 237.69
  • White Eemax water heater on a white background
    White water heater with Eemax logo on a white background
    Sold out

    Eemax LavAdvantage SPEX55T-ML Multi-Lav Tankless Water Heater | 5.5kW 240V

    Eemax
    $ 0.00 - $ 0.00
    $ 0.00
    $ 281.99
    $ 281.99 - $ 281.99
    $ 281.99

    Eemax LavAdvantage SPEX55T-ML Multi-Lavatory Tankless Electric Water Heater Brand: Eemax SKU: SPEX55T-ML Product Details The Eemax SPEX55T-ML...

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    $ 0.00 - $ 0.00
    $ 0.00
    $ 281.99
    $ 281.99 - $ 281.99
    $ 281.99
    Sold out
  • Diagram of a heating system with labeled components and step-by-step process on a white background.
    Eemax water heater on a white background
    Sold out

    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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 270.04
    $ 270.04 - $ 270.04
    $ 270.04
    Sold out

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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