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Tankless Venting

Tankless install and vent kits to finish gas (NG/LP) and high-output electric water heaters cleanly and to spec. Shop concentric and twin-pipe venting, wall/roof terminations, thimbles and flashings, pipe covers, isolation/flush valves, and condensate parts—then match diameters and lengths to your model’s tables.

Shop by need

  • Concentric vent kits: coaxial intake/exhaust with horizontal or vertical terminations
  • Twin-pipe venting: separate intake and exhaust in PVC/CPVC/PP (per manual/code)
  • Terminations & adaptors: low-profile wall caps, roof cones, rain caps, conversion adaptors
  • Pass-through & sealing: wall thimbles, firestops, roof flashings, sealant and gaskets
  • Lengths & fittings: straight pipe, long/short-radius 45°/90° elbows, support clamps
  • Pipe covers & mounts: trim covers, brackets, stand-off kits, intake screens
  • Water/gas hook-up: isolation/flush valve sets, flexible gas connectors, shut-off valves
  • Condensate: traps, hose kits, pumps, and neutralizers for condensing units

Quick choosing guide

  1. Confirm model & type: indoor vs outdoor; condensing vs non-condensing. Use only vent materials approved by the manufacturer and local code (e.g., PVC/CPVC/PP for many condensing models; Category III stainless for some non-condensing).
  2. Pick vent style: Concentric simplifies wall/roof penetrations; twin-pipe is flexible for long runs or existing chases.
  3. Size the diameter: choose 2", 3", or 4" per the spec sheet. Calculate total equivalent length (add elbows) and stay within limits.
  4. Plan termination: horizontal or vertical, with code clearances to windows, doors, and grade. For condensing exhaust, pitch the vent back to the heater to drain condensate.
  5. Complete the kit: thimble/firestop, flashing, required adaptors, support hardware, pipe cover, and—on condensing models—condensate drain and neutralizer.
  6. Hook up water & gas: add isolation/flush valves, sediment/scale protection, a listed gas shut-off and connector, and a nearby outlet if the unit needs power.


  •

    Rinnai - 229308NPP - 2 in. / 4 in. x 10 in. Plastic Condensing Vent Pipe Extension Kit

    Rinnai
    $ 33.79 - $ 33.79
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79

    Concentric venting allows for secure connection 2 in. / 4 in. condensing vent pipe extension 10 in For use with Sensei Se+ tankless water heaters ...

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    $ 33.79 - $ 33.79
    $ 33.79
    $ 33.79 - $ 33.79
    $ 33.79

  • Rinnai Bottom plate for Pipe Cover 109001364 Fits Sensei RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 67.00
    $ 67.00 - $ 67.00
    $ 67.00

    Rinnai Bottom plate for Pipe Cover  109001364 Fits Sensei RX

    $ 0.00 - $ 0.00
    $ 0.00
    $ 67.00
    $ 67.00 - $ 67.00
    $ 67.00

  • Rinnai - 229309NPP - 2 in. / 4 in. x 19.5in. Plastic Condensing Vent Pipe Extension Kit

    Rinnai
    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99

    Concentric venting allows for secure connection 2 in. / 4 in. condensing vent pipe extension 19.5 in For use with Sensei Se+ tankless water heater...

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    $ 29.99 - $ 29.99
    $ 29.99
    $ 29.99 - $ 29.99
    $ 29.99

  • Rinnai - 227412NPP - 2/4 Condensing Vertical Starter Adapter

    Rinnai
    $ 56.00 - $ 56.00
    $ 56.00
    $ 56.00 - $ 56.00
    $ 56.00

    Rinnai 2/4 Condensing Vertical Starter Adapter Weight: 1.39lbs Height: 5.63" Width: 5.71" Depth: 9.92"

    $ 56.00 - $ 56.00
    $ 56.00
    $ 56.00 - $ 56.00
    $ 56.00

  • Rinnai - 229013NPP - 2/4 21 Inch Condensing Horizontal Termination Kit

    Rinnai
    $ 81.00 - $ 81.00
    $ 81.00
    $ 81.00 - $ 81.00
    $ 81.00

    2 in. / 4 in. condensing horizontal termination kit 21 in. For use with Sensei Se+ tankless water heaters (condensing) and m-series boilers White ...

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    $ 81.00 - $ 81.00
    $ 81.00
    $ 81.00 - $ 81.00
    $ 81.00

  • Rinnai - 229012NPP - 12 Inch 2/4 Condensing Horizontal Termination Kit

    Rinnai
    $ 72.99 - $ 72.99
    $ 72.99
    $ 72.99 - $ 72.99
    $ 72.99

    2/4 Cond Horiz Termination Kit 12in Brand Model Compatibility SE+ Tankless Water Heaters and M-Series Boilers Diameter 4 in Lengt...

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    $ 72.99 - $ 72.99
    $ 72.99
    $ 72.99 - $ 72.99
    $ 72.99
  • Rinnai - Rinnai Pipe Cover Enclosure for Luxury Series PCD01-SM2 - - Water Heater Covers - Big Frog Supply
    Sold out

    Rinnai - PCD01-SM2 - Pipe Cover Enclosure for Luxury Series

    Rinnai
    $ 141.00 - $ 141.00
    $ 141.00
    $ 141.00 - $ 141.00
    $ 141.00

    Rinnai cover enclosure for luxury series tankless water heaters. Cover your pipes to prevent damage, heat, cold from the pipes. SKU: PCD01-SM2 Act...

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    $ 141.00 - $ 141.00
    $ 141.00
    $ 141.00 - $ 141.00
    $ 141.00
    Sold out
  • 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 - 187595NPP - 2in x 2/4 Condensing Twin Pipe Adaptor

    Rinnai
    $ 92.00 - $ 92.00
    $ 92.00
    $ 92.00 - $ 92.00
    $ 92.00

    Features: Twin pipe adapter 2 in. x 2/4 Dimensions: 5.67 in. x 9.92 in. x 14.4 in. Water heater accessory For use with SENSEI SE+ tankless water h...

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    $ 92.00 - $ 92.00
    $ 92.00
    $ 92.00 - $ 92.00
    $ 92.00

  • Rinnai - 229205NPP - Condensing 2/4 45 Degree Elbow (2 Pack) for Tankless Water Heaters 229205NPP

    Rinnai
    $ 50.75 - $ 50.75
    $ 50.75
    $ 50.75 - $ 50.75
    $ 50.75

    For use with Sensei Se+ tankless water heaters (condensing) and m-series boilers. Refer to the Rinnai Water Heater Installation and Operation man...

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    $ 50.75 - $ 50.75
    $ 50.75
    $ 50.75 - $ 50.75
    $ 50.75
  • 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 229032 - 2/4" Condensing Horizontal Termination Kit, 21" (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 78.00
    $ 78.00 - $ 78.00
    $ 78.00

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience.  For use with the following models: ...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 78.00
    $ 78.00 - $ 78.00
    $ 78.00

  • Rinnai 229031 - 12", 2"/4" Condensing Horizontal Termination Kit (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 62.17
    $ 62.17 - $ 62.17
    $ 62.17

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience.  For use with the following models...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 62.17
    $ 62.17 - $ 62.17
    $ 62.17
  • 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 All-Weather Wall Discharge 223159 - - Water Heater Venting - Big Frog Supply

    Rinnai - 223159 - All-Weather Wall Discharge

    Rinnai
    $ 79.99 - $ 79.99
    $ 79.99
    $ 79.99 - $ 79.99
    $ 79.99

    Rinnai's all-weather wall discharge 223159. Product color may vary from displayed image.

    $ 79.99 - $ 79.99
    $ 79.99
    $ 79.99 - $ 79.99
    $ 79.99
  • 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
  • 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 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...

    View full details
    $ 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...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 77.00
    $ 77.00 - $ 77.00
    $ 77.00
    Sold out
  • Sold out

    Rinnai 229320- 39" 2/4 Condensing Vent Pipe Extension (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 41.99
    $ 41.99 - $ 41.99
    $ 41.99

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

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 41.99
    $ 41.99 - $ 41.99
    $ 41.99
    Sold out
  • Sold out

    Rinnai 229319- 2/4" x 19.5" Condensing Vent Pipe Extension (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 30.99
    $ 30.99 - $ 30.99
    $ 30.99

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

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 30.99
    $ 30.99 - $ 30.99
    $ 30.99
    Sold out
  • Sold out

    Rinnai 229318 - 2/4" x 10" Condensing Vent Pipe Extension (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 24.39
    $ 24.39 - $ 24.39
    $ 24.39

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

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 24.39
    $ 24.39 - $ 24.39
    $ 24.39
    Sold out
  • Sold out

    Rinnai 224359- 2/4" Condensing Roof Discharge Termination, 20" (Above Roof) (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 64.98
    $ 64.98 - $ 64.98
    $ 64.98

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

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 64.98
    $ 64.98 - $ 64.98
    $ 64.98
    Sold out
  • Sold out

    Rinnai 229033 - 2/4" Condensing Wall Termination, 21" w/ 2 Wall Plates (PPtl) fits SENSEI RX

    Rinnai
    $ 0.00 - $ 0.00
    $ 0.00
    $ 32.99
    $ 32.99 - $ 32.99
    $ 32.99

    Ubbink Polypropylene concentric venting delivers a professional solution with improved safety and convenience.  For use with the following models: ...

    View full details
    $ 0.00 - $ 0.00
    $ 0.00
    $ 32.99
    $ 32.99 - $ 32.99
    $ 32.99
    Sold out

Pro tips: Dry-fit and measure twice, support vents per the manual, and use the manufacturer’s approved cement or gasketed joints (no sealant on gasketed lock-rings). Maintain clearances, neutralize condensate, and keep a printout of your vent length calc with the install. After start-up, check for leaks, verify combustion settings, and run a full hot-water draw. Questions? Tell us model, fuel, vent path, and pipe size—we’ll recommend the right kit.

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