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's PDF's of Vent Accessories

Vent Kits for Horizontal Venting

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

Venting diagrams shown are for illustrative purposes only.

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 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

For Venting your Rheem Tankless Direct Vent, Rheem offers three Sweet Termination Direct VentKits For quick and Easy side wall vent Terminations:

RTG20058 5 to 9 Sweet Vent Term

RTG20059 9 to 13 Sweet Vent Term

RTG20060 13 to 17 Inch Sweet Vent Term

RTG20033VHT Rheem Vertical Concentric Vent Kit

RTG20066 3", Horizontal Vent Kit Features:
• (1) Adapter
• (1) 90 degree elbows
• (1) Horizontal termination
• (1) 12" length vent pipe
• (1) Pressure relief valve
• (1) 18-AWG, 2 conductor thermostat

37.5" Length Vent Pipe

Horizontal/Vertical In-Line Drain   2-Piece Horizontal Thimble   90 Degree Elbow

Adapter