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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

    Rheem - SP6379M - 19-inch Thermocouple

    Rheem
    $ 10.17 - $ 10.17
    $ 10.17
    $ 10.17 - $ 10.17
    $ 10.17

    The Rheem 19 in. thermocouple replacement kit is designed to work on select Rheem gas water heaters. The thermocouple allows for a properly functio...

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    $ 10.17 - $ 10.17
    $ 10.17
    $ 10.17 - $ 10.17
    $ 10.17
    Sold out
  • 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...

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    $ 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...

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    $ 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...

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    $ 24.93 - $ 24.93
    $ 24.93
    $ 24.93 - $ 24.93
    $ 24.93
    Sold out
  • Sold out

    Rheem - SP610160 - Element - 4500-Watt CO UF Element (240V)

    Rheem
    $ 40.71 - $ 40.71
    $ 40.71
    $ 40.71 - $ 40.71
    $ 40.71

    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...

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    $ 40.71 - $ 40.71
    $ 40.71
    $ 40.71 - $ 40.71
    $ 40.71
    Sold out
  • Sold out

    Rheem - UV11698 - Therm-O-Disc Upper Thermostat Electric Water Heaters

    Rheem
    $ 17.28 - $ 17.28
    $ 17.28
    $ 17.28 - $ 17.28
    $ 17.28

    2-Pole High Limit - Normally Open & Normally Closed Thermostat Contacts (TOD)This design is the most popular Upper Thermostat in residential el...

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    $ 17.28 - $ 17.28
    $ 17.28
    $ 17.28 - $ 17.28
    $ 17.28
    Sold out
  • Sold out

    Rheem - SP10869MM - Element, 4500W

    Rheem
    $ 22.91 - $ 22.91
    $ 22.91
    $ 22.91 - $ 22.91
    $ 22.91

    240-Volt, 4500-Watt Stainless Steel Heating Element for Electric Water Heaters Rheem PROTECH screw-in water heater elements feature true OEM perfor...

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    $ 22.91 - $ 22.91
    $ 22.91
    $ 22.91 - $ 22.91
    $ 22.91
    Sold out
  • Sold out

    Rheem - SP20075 - Pilot Assembly Replacement Kit

    Rheem
    $ 47.89 - $ 47.89
    $ 47.89
    $ 47.89 - $ 47.89
    $ 47.89

    The Rheem PROTECH Pilot Assembly Replacement Kit contains everything that you need to replace the Pilot Assembly on your Rheem water heater. This k...

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    $ 47.89 - $ 47.89
    $ 47.89
    $ 47.89 - $ 47.89
    $ 47.89
    Sold out
  • Sold out

    Rheem - SP11526C - 0.900 in. Dia Magnesium Anode Rod

    Rheem
    $ 23.61 - $ 23.61
    $ 23.61
    $ 23.61 - $ 23.61
    $ 23.61

    Rheem PROTECH anode rods are an important line of defense in preventing corrosion and leaks in your water heater. These devices work because the me...

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    $ 23.61 - $ 23.61
    $ 23.61
    $ 23.61 - $ 23.61
    $ 23.61
    Sold out
  • Sold out

    Rheem - SP20172 - Flammable Vapor FV Sensor Kit

    Rheem
    $ 23.61 - $ 23.61
    $ 23.61
    $ 23.61 - $ 23.61
    $ 23.61

    The Rheem PROTECH FV Sensor Replacement Kit contains everything that you need to replace the FV Sensor Assembly on your Rheem water heater. This ki...

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    $ 23.61 - $ 23.61
    $ 23.61
    $ 23.61 - $ 23.61
    $ 23.61
    Sold out
  • Sold out

    Rheem - SP11309C - Anode Rod

    Rheem
    $ 24.71 - $ 24.71
    $ 24.71
    $ 24.71 - $ 24.71
    $ 24.71

    Rheem PROTECH anode rods are an important line of defense in preventing corrosion and leaks in your water heater. These devices work because the me...

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    $ 24.71 - $ 24.71
    $ 24.71
    $ 24.71 - $ 24.71
    $ 24.71
    Sold out
  • Sold out

    Rheem - SP20060 - Electric Water Heater Tune-Up Kit

    Rheem
    $ 34.92 - $ 34.92
    $ 34.92
    $ 34.92 - $ 34.92
    $ 34.92

    Repair your water heater rather than replace it with the Rheem PROTECH Electric Water Heater Tune-Up Kit. This OEM quality Electric Water Heater Tu...

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    $ 34.92 - $ 34.92
    $ 34.92
    $ 34.92 - $ 34.92
    $ 34.92
    Sold out
  • Sold out

    Rheem - SP10552ML - Water Heater Element, Small

    Rheem
    $ 12.75 - $ 12.75
    $ 12.75
    $ 12.75 - $ 12.75
    $ 12.75

    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
    $ 12.75 - $ 12.75
    $ 12.75
    $ 12.75 - $ 12.75
    $ 12.75
    Sold out
  • Sold out

    Rheem - SP10874DL - 1" 1000W Copper Resistored Screw-in Element MWD (120V)

    Rheem
    $ 36.62 - $ 36.62
    $ 36.62
    $ 36.62 - $ 36.62
    $ 36.62

    1" 1000W Copper Resistored Screw-in Element MWD (120V) Watt Density Classification: LWD Input Voltage (V): 120 Wattage at 120V (W): 1000 Watt Dens...

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    $ 36.62 - $ 36.62
    $ 36.62
    $ 36.62 - $ 36.62
    $ 36.62
    Sold out
  • Sold out

    Rheem - SP21058 - Pilot Assembly Replacement Kit

    Rheem
    $ 94.18 - $ 94.18
    $ 94.18
    $ 94.18 - $ 94.18
    $ 94.18

    Pilot Assembly Replacement Kit

    $ 94.18 - $ 94.18
    $ 94.18
    $ 94.18 - $ 94.18
    $ 94.18
    Sold out
  • Sold out

    Rheem - SP20832E - OEM Upgraded Replacement for Rheem Water Heater Natural Gas Valve

    Rheem
    $ 187.99 - $ 187.99
    $ 187.99
    $ 187.99 - $ 187.99
    $ 187.99

    Rheem Water Heater SP20832E GAS CONTROL (THERMOSTAT)

    $ 187.99 - $ 187.99
    $ 187.99
    $ 187.99 - $ 187.99
    $ 187.99
    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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