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Rinnai

Rinnai tankless water heaters deliver endless hot water with compact, efficient designs. Build the right system with indoor or outdoor models in natural gas or propane, condensing or non-condensing, recirculation options, clean venting, and the install parts to finish the job.

Shop by category

  • Condensing (SENSEI series): high-efficiency indoor/outdoor units; concentric or 2-pipe venting
  • Non-condensing: value models for simple replacements and mild climates
  • Recirculation: built-in pump models, recirc-ready units, crossover/bypass kits, timers and controls
  • Venting & covers: concentric and twin-pipe kits, terminations, pipe covers, wall thimbles
  • Controls: wall remotes and optional Wi-Fi/app modules
  • Install & service parts: isolation/flush valve kits, filters, condensate neutralizers, NG/LP conversion kits, repair parts

Quick choosing guide

  1. Size by demand: total peak fixtures and calculate GPM at your winter temperature rise; select a unit that meets that flow on the spec curve.
  2. Pick location & fuel: indoor with a vent route or outdoor where climate allows; choose natural gas or propane and confirm gas line capacity.
  3. Efficiency: choose condensing for higher efficiency (plan a condensate drain/neutralizer) or non-condensing for straightforward replacements.
  4. Faster hot water: pick a built-in recirc model or add a recirc kit to a recirc-ready unit; set schedules to reduce wait time.
  5. Venting: select concentric or 2-pipe per the manual; follow clearances and use approved materials and terminations.
  6. Complete the kit: install isolation/flush valves, pipe cover if desired, controller/Wi-Fi, sediment filter, and proper electrical/gas shutoff.


  • Sold out

    Rinnai V75iN Natural Gas Tankless Water Heater, 7.5 Gallons Per Minute , While supplies last (Replaced by RE180)

    Rinnai
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99

    Spec Sheet  Install Manual Current RL and 4 of the V models will be discontinued and replaced with the New RE•SERIES™ Non-Condensing models includ...

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    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    $ 1,066.99 - $ 1,066.99
    $ 1,066.99
    Sold out

  • Rinnai - RWMKT03P - Control-R Wireless Demand Recirculation Kit (Pump+Push Button,Temp Sensor)

    Rinnai
    $ 806.00 - $ 806.00
    $ 806.00
    $ 806.00 - $ 806.00
    $ 806.00

    Rinnai Control-R Wi-Fi Module and mobile app no longer are compatible w/ the RUCS/RUS Tankless Water Heaters Rinnai Control-R Kit with Push-Butto...

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    $ 806.00 - $ 806.00
    $ 806.00
    $ 806.00 - $ 806.00
    $ 806.00

  • Rinnai - RWMKT03 - Control-R Wireless Demand Recirculation Kit (Push Button+Temp Sensor)

    Rinnai
    $ 559.00 - $ 559.00
    $ 559.00
    $ 559.00 - $ 559.00
    $ 559.00

    Rinnai Control-R Wi-Fi Module and mobile app no longer are compatible w/ the RUCS/RUS Tankless Water Heaters Rinnai Control-R Kit with Push-Button ...

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    $ 559.00 - $ 559.00
    $ 559.00
    $ 559.00 - $ 559.00
    $ 559.00

  • Rinnai - RWMKT01P - Control-R Wireless Demand Recirculation Kit (Pump+Push Button)

    Rinnai
    $ 626.00 - $ 626.00
    $ 626.00
    $ 626.00 - $ 626.00
    $ 626.00

    Rinnai Control-R Wi-Fi Module and mobile app no longer are compatible w/ the RUCS/RUS Tankless Water Heaters Rinnai Control-R Kit with Push-Butto...

    View full details
    $ 626.00 - $ 626.00
    $ 626.00
    $ 626.00 - $ 626.00
    $ 626.00

  • Rinnai - RWMKT01 - Control-R Wireless Demand Recirculation Kit (Push Button)

    Rinnai
    $ 439.00 - $ 439.00
    $ 439.00
    $ 439.00 - $ 439.00
    $ 439.00

    Rinnai Control-R Wi-Fi Module and mobile app no longer are compatible w/ the RUCS/RUS Tankless Water Heaters Control Your Rinnai Tankless Water Hea...

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    $ 439.00 - $ 439.00
    $ 439.00
    $ 439.00 - $ 439.00
    $ 439.00

  • Rinnai - RWMMS01 - Control-R Motion Sensor

    Rinnai
    $ 312.00 - $ 312.00
    $ 312.00
    $ 312.00 - $ 312.00
    $ 312.00

    The Rinnai Control-R motion sensor is mounted near a main point of use such as a kitchen faucet or bathroom sink, and operates the recirculation sy...

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    $ 312.00 - $ 312.00
    $ 312.00
    $ 312.00 - $ 312.00
    $ 312.00
  • Rinnai FC510N Vent-Free Natural Gas Heater

    Rinnai FC510N - Vent-Free Natural Gas Convector

    Rinnai
    $ 942.20 - $ 942.20
    $ 942.20
    $ 942.20 - $ 942.20
    $ 942.20

    Rinnai FC510N Vent-Free Fan Convector – Natural Gas The Rinnai FC510N delivers efficient, quiet heat in a compact vent-free design built for small...

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    $ 942.20 - $ 942.20
    $ 942.20
    $ 942.20 - $ 942.20
    $ 942.20
  • Rinnai FC510P Vent-Free Propane Heater
    Rinnai FC510P Vent-Free Propane Heater

    Rinnai - FC510P - Vent-Free Propane Convector

    Rinnai
    $ 942.20 - $ 942.20
    $ 942.20
    $ 942.20 - $ 942.20
    $ 942.20

    Rinnai FC510P Vent-Free Fan Convector – Propane (LP) The Rinnai FC510P is a compact, quiet, and efficient vent-free heater designed for small room...

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    $ 942.20 - $ 942.20
    $ 942.20
    $ 942.20 - $ 942.20
    $ 942.20
  • Tankless Water Heater - Rinnai FC824N Vent-Free Natural Gas Heater
    Tankless Water Heater - Rinnai FC824N Vent-Free Natural Gas Heater

    Rinnai - FC824N - Vent-Free Natural Gas Convector

    Rinnai
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70

    Rinnai FC824N Vent-Free Fan Convector – Natural Gas The Rinnai FC824N delivers powerful, even heat for medium to large rooms using clean-burning N...

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    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
  • Tankless Water Heater - Rinnai FC824P Vent-Free Propane Heater
    Tankless Water Heater - Rinnai FC824P Vent-Free Propane Heater

    Rinnai - FC824P - Vent-Free Propane Convector

    Rinnai
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70

    Rinnai FC824P Vent-Free Fan Convector – Propane (LP) The Rinnai FC824P provides strong, efficient heat for medium to large rooms using clean-burni...

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    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
    $ 1,134.70 - $ 1,134.70
    $ 1,134.70
  • Sold out

    Rinnai - E110CRN - Condensing Natural Gas Boiler

    Rinnai
    $ 2,562.75 - $ 2,562.75
    $ 2,562.75
    $ 2,562.75 - $ 2,562.75
    $ 2,562.75

    Rinnai, dedicated to the latest technology and innovation in water heating efficiency and reliability, have created the best condensing boiler on t...

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    $ 2,562.75 - $ 2,562.75
    $ 2,562.75
    $ 2,562.75 - $ 2,562.75
    $ 2,562.75
    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

  • Whitlam - FLOW AIDE System Descaler (1 Qt)

    Whitlam
    $ 21.49 - $ 21.49
    $ 21.49
    $ 21.49 - $ 21.49
    $ 21.49

    Install Manual FLOW AIDE® System Descaler quickly dissolves water scale, lime, rust, and other water formed deposits, restoring efficiency to most ...

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    $ 21.49 - $ 21.49
    $ 21.49
    $ 21.49 - $ 21.49
    $ 21.49

  • Whitlam - Flow-Aide System Descaler Kit

    Whitlam
    $ 174.99 - $ 174.99
    $ 174.99
    $ 174.99 - $ 174.99
    $ 174.99

    Install Manual Complete Descaler Kit, Includes: 3.5 Gallon Bucket, 800 GPH Pump, 2 Rubber Hoses, 1 Quart FLOW-AIDE® (FLOW32). FLOW AIDE® System Des...

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    $ 174.99 - $ 174.99
    $ 174.99
    $ 174.99 - $ 174.99
    $ 174.99
  • Sold out

    Rinnai - PCD03-SM2-BP - Bottom Plate Tankless Water Heater Accessories

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

    Features: Bottom plate for external value series Compatible with Rinnai models: RL75EN,RL75EP,RL94EN,RL94EP Manufacturer warranty: 5 Years Specif...

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    $ 58.00 - $ 58.00
    $ 58.00
    $ 58.00 - $ 58.00
    $ 58.00
    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...

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    $ 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 - Rinnai Multi Unit Control kit REU-MSB-M - - Water Heater Controllers - Big Frog Supply

    Rinnai - REU-MSB-M - Multi Unit Control kit

    Rinnai
    $ 235.00 - $ 235.00
    $ 235.00
    $ 235.00 - $ 235.00
    $ 235.00

    Rinnai Multi Unit Control kit REU-MSB-M For use with Rinnai tankless water heaters. Electronically connects 3 tankless water heaters and allows the...

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    $ 235.00 - $ 235.00
    $ 235.00
    $ 235.00 - $ 235.00
    $ 235.00
  • Rinnai - Rinnai Connect Cable MSB-M - - Water Heater Controllers - Big Frog Supply

    Rinnai - MSB-M - Connect Cable

    Rinnai
    $ 102.00 - $ 102.00
    $ 102.00
    $ 102.00 - $ 102.00
    $ 102.00

    Rinnai Connect Cable MSB-M for Rinnai tankless water heaters. 13.1 ft with terminal connectors.

    $ 102.00 - $ 102.00
    $ 102.00
    $ 102.00 - $ 102.00
    $ 102.00
  • Rinnai - Rinnai Cable Connect REU-MSB-C1 - - Water Heater Controllers - Big Frog Supply

    Rinnai - REU-MSB-C1 - Cable Connect

    Rinnai
    $ 72.00 - $ 72.00
    $ 72.00
    $ 72.00 - $ 72.00
    $ 72.00

    Rinnai Cable Connect REU-MSB-C1 for Rinnai tankless water heater controllers.

    $ 72.00 - $ 72.00
    $ 72.00
    $ 72.00 - $ 72.00
    $ 72.00
  • Rinnai - EZ Connect Cord for LS units - - Water Heater Controllers - Big Frog Supply
    Sold out

    Rinnai - REU-EZC-1US - EZ Connect Cord for Rinnai units

    Rinnai
    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00

    EZ Connect Cord for multiple connecting Rinnai units together.

    $ 71.00 - $ 71.00
    $ 71.00
    $ 71.00 - $ 71.00
    $ 71.00
    Sold out
  • Rinnai - Rinnai Digial Recirculation Controller MC-195T-US - - Water Heater Controllers - Big Frog Supply

    Rinnai MC-195T-US Digital Recirculation Controller

    Rinnai
    $ 275.30 - $ 275.30
    $ 275.30
    $ 275.30 - $ 275.30
    $ 275.30

    Rinnai Recirculation Controller Rinnai MC-195T-US Digital Recirculation Controller brings added convenience and flexibility to your compatible Rinn...

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    $ 275.30 - $ 275.30
    $ 275.30
    $ 275.30 - $ 275.30
    $ 275.30
  • Rinnai - Rinnai Euro White Pipe Bottom Plate for Ultra Series PCD07-EW-BP - - Water Heater Covers - Big Frog Supply

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

    $ 58.00 - $ 58.00
    $ 58.00
    $ 58.00 - $ 58.00
    $ 58.00
  • Rinnai - Rinnai Euro White Pipe Cover Enclosure for Ultra Series PCD07-EW - - Water Heater Covers - Big Frog Supply

    Rinnai PCD07-EW Euro White Pipe Cover Enclosure for RUS Ultra Series Tankless Water Heaters

    Rinnai
    $ 246.95 - $ 246.95
    $ 246.95
    $ 246.95 - $ 246.95
    $ 246.95

    Rinnai cover enclosure in European White color for ultra series tankless water heaters. Cover your pipes protecting them with this cover. SKU: PCD0...

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    $ 246.95 - $ 246.95
    $ 246.95
    $ 246.95 - $ 246.95
    $ 246.95

Pro tips: Size from the coldest inlet temperature, verify gas line capacity and vent route before mounting, and neutralize condensate on condensing models. Add isolation valves for easy descaling, set recirc schedules, and register your unit for warranty. Not sure which Rinnai and kit you need? Tell us fuel type, location, and demand—we will build a dialed-in list.

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