Replacement Parts List

Ref# RheemPart# Description RTG-66X RTG-66X-1
1 RTG20164AS Control Board ● ●
RTG20074EE Power Line Fuse(3A) ● ●
RTG20164P Heat Exchanger Thermistor - Yellow ● ●
RTG20074CU Ambient Thermistor - Blue ● ●
RTG20006AR Inlet Thermistor - White ● ●
RTG20006BB Outlet Thermistor - Black ● ●
2 RTG20164B Gas Valve - NAT and LP ● ●
RTG20164N Gas Control Resistor ● ●
7 RTG20164K Gas Inlet Connector ¾” ● ●
3 RTG20164AC Burner Assembly ● ●
6 RTG20164AE Burner Manifold-LP ● ●
6 RTG20164AD Burner Manifold-NAT ● ●
4 RTG20164U Igniter Coil ● ●
RTG20164H Flame Rod ● ●
RTG20074DL Igniter Electrode ● ●
5 RTG20006CC Blower Motor ● ●
RTG20164T Blower Case ● ●
8 RTG20164L Water Control Valve ● ●
8a RTG20164M Water Bypass Valve ● ●
9 RTG20164J Water Inlet Connector ¾” ● ●
14 RTG20164AA Remote Control Terminal Block ● ●
RTG20164Z Terminal Block Wire Assy ● ●
RTG20164AB Screw Pan FT 4x12 ● ●
10 RTG20164AK Inlet Water Filter ● ●
11 RTG20074CE Hot Outlet Connector ● ●
RTG20006AV Drain Relief Valve ● ●
RTG20186 Replacement Screw Kit ● ●
RTG20206 Replacement O-Ring Kit ● ●
Parts for 66X Series (out of production)
Accessories
Remote Controls
RTG20006DW UMC-117 Main Remote Control
RTG20006DU USC1-117 Bath Remote Control
RTG20006DV USC2-117 Second Bath Remote Control
Service Valves
RTG20220 Tankless Service Valve Kit with Relief Valve
RTG20220AB Tankless Service Valve Kit with Relief Valve - California Code
Relief Valve
AP12993C Pressure Relief Valve
EZ-Link™ Cable
RTG20040 6-ft. EZ-Link™ Cable
for Rheem, Ruud, Rheem-Ruud, Richmond, EcoSense and Paloma tankless water heaters | 35