Replacement Parts List
* If Serial Number is 0906 or earlier
** If Serial Number is 1006 or newer
† The RTGL and ECO models that do not have a sufx, such as a -1 or -2, are equivalent to the RTG-2 series and utilize the same parts. RTGL and
ECO models with a sufx, such as -1, are equivalent to the models with a like sufx.
Ref # Rheem Part # Description
RTG-74X
RTG-74X-1
RTGL74X-1
RTG-74X-2
RTGL74X
†
GT-199X
GT-199X-1
GT-199X-2
1 RTG20006JC Control Board ● ●
1 RTG20006PG Control Board ● ● ● ●
RTG20006CS Control Board Fuse (5A) ● ● ● ● ● ●
RTG20074EE Power Line Fuse (3A) ● ● ● ● ● ●
2 RTG20006PA Gas Valve ● ● ● ● ● ●
3 RTG20006UE Burner Assembly - NAT/LP ●** ● ●** ●
3 RTG20006VK Burner Assembly -NAT/LP ● ●* ● ●*
RTG20006L Burner Manifold - R NAT ● ● ● ●
RTG20006M Burner Manifold - R LP ● ● ● ●
RTG20006R Burner Manifold - L NAT ● ● ● ●
RTG20006S Burner Manifold - L LP ● ● ● ●
RTG20006UJ Burner Manifold - R NAT ● ●
RTG20006UK Burner Manifold - R LP ● ●
RTG20006UN Burner Manifold - L NAT ● ●
RTG20006UP Burner Manifold - L LP ● ●
4 RTG20006AA Igniter Coil ● ● ● ●
RTG20006AC Flame Rod ● ● ● ●
RTG20006AD Igniter Electrode ● ● ● ● ● ●
4 RTG20006UT Igniter Coil ● ●
RTG20006UU Flame Rod ● ●
5 RTG20006CC Fan Assembly ● ● ● ● ● ●
RTG20006AR Inlet Thermistor - White ● ● ● ● ● ●
RTG20006BB Outlet Thermistor - Black ● ● ● ● ● ●
RTG20006BC Heat Exchanger Thermistor - Yellow ● ● ● ● ● ●
RTG20006BV Ambient Thermistor - Blue ● ● ● ●
RTG20006CB Transformer (120v to 100v) ● ● ● ●
RTG20006UV Ambient Thermistor - Blue ● ●
7 RTG20006AN Gas Inlet Connector ¾” ● ● ● ● ● ●
8 RTG20006AU Water Control Valve ●
8 RTG20006JA Water Control Valve ● ● ● ● ●
9 RTG20006AL Water Inlet Connector ¾” ● ● ● ● ● ●
10 RTG20006AS Inlet Water Filter ● ● ● ● ● ●
11 RTG20006AF Hot Outlet Connector ● ● ● ● ● ●
RTG20006AV Drain Relief Valve ● ● ● ● ● ●
RTG20006CW Door Screw ● ● ●
RTG20006CZ Chassis Screw ● ● ●
RTG20006VD Mounting Brackets ● ● ● ● ● ●
RTG20186 Replacement Screw Kit ● ● ● ● ● ●
RTG20206 Replacement O-Ring Kit ● ● ● ● ● ●
Parts for 74X and GT-199X Series (out of production)
for Rheem, Ruud, Rheem-Ruud, Richmond, EcoSense and Paloma tankless water heaters | 39