Rheem Tankless Water Heater  Venting

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Venting Information

All indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using Category III stainless steel venting material (No other venting material is permitted). RTG-42PV and RTG-53PV indoor models require 3" stainless steel venting. RTG-74PV and GT-199PV indoor models require 4" stainless steel venting. Venting details, including clearances and diagrams, can be found in the "Use & Care Manual" of Rheem indoor tankless water heaters. NOTE: Rheem outdoor tankless water heaters do not require venting materials.

When choosing an indoor location, you should consider the shortest venting distance to the outdoors. Consult your professional installer or contact us for maximum venting distances.

Rheem offers all necessary venting materials, accessories and expertise to make your tankless water heater installation easy - including horizontal vent kits listed below.

Rheem Concentric Vent Kits
Horizontal Vent Termination Kit by Metal Fab

  • Manufactured by Metal Fab, Inc. specifically to fit Rheem tankless water heaters
  • Only for use with RTG-64DV, RTG-84DV and RTG-95DV models
  • For up to 10" walls
  • Can be extended Includes:
  • 94-Degree Elbow
  • Long Termination
  • 12" Wall Plate
   
 
   

Vertical Vent Termination Kit by Metal Fab

  • Manufactured by Metal Fab, Inc. specifically to fit Rheem tankless water heaters.
  • Only for use with RTG-64DV, RTG-84DV and RTG-95DV models.
  • Does not include vertical vent pipe.

Vertical Vent Termination Kit by Metal Fab

  • Storm Collar.
  • 6/12 to 12/12 Pitched Cone Flashing.
  • Vertical Termination with Rain Cap.
   

Rheem H95 and H84 Vent Kits -

  • 3" PVC MAX exhaust vent length of 36 feet with 3-90 degree elbows to maintain 199,900 btu MAX fire.
  • 2" VC MAX exhaust vent length of 5 feet with 1-90 degree elbow to maintain 199,900 btu MAX fire.
  • Intake vent to match exhaust vent lengths, solid core only on exhaust.
   

Rheem horizontal vent kit (RTG20003) for RTG-42PV series indoor gas models includes:

  • (1) Adapter
  • (2) 90 degree elbows
  • (1) 12" length vent pipe
  • (1) Two-piece 6" - 19" adjustable length pipe
  • (1) Two-piece horizontal wall thimble
  • (1) 90 degree termination elbow with vent screen
  • (1) Pressure relief valve

Rheem horizontal vent kit (RTG20007) for RTG-74PV and GT-199PV series indoor gas models includes:

  • (1) Adapter
  • (2) 90 degree elbows
  • (1) 12" length vent pipe
  • (1) Two-piece 6" - 19" adjustable length pipe
  • (1) Two-piece horizontal wall thimble
  • (1) 90 degree termination elbow with vent screen
  • (1) Pressure relief valve
  • 18-AWG, 2-conductor thermostat wire for remote control

Rheem horizontal vent kit (RTG20066 ) for RTG-53DV series indoor gas models includes:

  • (1) Adapter
  • (1) 90 degree elbows
  • (1) Horizontal termination
  • (1) 12" length vent pipe
  • (1) Pressure relief valve
  • (1) 18-AWG, 2 conductor thermostat wire for remote control

Rheem Horizontal Vent Kit (RTG-20033HHT} for RTG-74DV and GT199DV series includes:

  • Faceplate
  • 1 12" Length - Concentric Pipe
  • 1 Horizontal Termination Adapter
  • 1 Air Intake Tee-Heat Fab
  • 8 Self Tapping Screws

Rheem Horizontal Vent Kit (RTG-20032VHT} for RTG-74DV and GT199DV series includes:

  • 1 36" Length - 4"/7" Concentric Pipe
  • 1 Vertical Termination Adapter
  • 1 Air Intake Tee-Heat Fab
  • 8 Self Tapping Screws
  • 1 Vertical Outlet Termination

Rheem Direct Vent Kits For the RTG-74 and GT-199 Direct Vent

All indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using Category III stainless steel venting material (No other venting material is permitted). RTG-42PV indoor models require 3" stainless steel venting. RTG-74PV and GT-199PV indoor models require 4" stainless steel venting. NOTE: Rheem outdoor tankless water heaters do not require venting materials. All Rheem tankless water heater venting material is made from Category III stainless steel for durability and safety. All components are UL 1738 certified. Manufactured using AL29-4C® advanced ferritic stainless steel with unmatched corrosion resistance for use with condensing furnaces and boilers. Utilizing a fail-safe gasket connection. No sealant is required. Rheem Tankless Water Heater