Rheem Tankless Water Heater Parts

Genuine Rheem replacement parts for Rheem gas tankless water heaters, listed by Rheem part number. Most parts here start with RTG2, the numbering Rheem uses for its tankless service parts, so you can match the number in your installation manual or on the old part.

You will find flame rods (RTG20212BE) and controller kits (RTG20213A), the inlet water filter (RTG20164AK) for RTGH condensing models, EZ-Link cable kits for linking two units, the AP17920 recirculation pump kit and cross-over valve kits. Concentric stainless steel venting covers 90° and 45° elbows, straight and adjustable vent lengths and vertical termination kits for RTG and RUTG models, along with cosmetic pipe covers and the freestanding EZ Rack.

Tankless parts are model-specific. Check the model number on the rating plate (for example RTG-84DVLN, RTGH-95DVLN or RTGH-84XLN) and confirm the part fits that model before ordering. A recurring error code, low flow, or no ignition is often traced to a dirty inlet filter or a worn flame rod, both inexpensive fixes. Gas and venting work should be done by a qualified installer.

Need the heater itself? See Rheem tankless water heaters, all Rheem water heater parts, or read how to flush a water heater and condensing vs non-condensing tankless.