Replacement Parts List

11
9
10
7
8
2
5
1
4
3
6
8a
14
Parts for 66X Series (out of production)
Fuel Type Program Chips
Fuel Type Description RTG-66X RTG-66X-1
Natural Gas Program Chip - Natural Gas RTG20164AH RTG20164AH
Propane Program Chip - LP Gas RTG20164AJ RTG20164AJ
Commercial Temperature Upgrade Kits
Fuel Type Description RTG-66X RTG-66X-1
Natural Gas Nat. Gas Temperature Upgade Kit RTG20192C RTG20192C
Propane LP Gas Temperature Upgade Kit RTG20192D RTG20192D
Only fuel-specific chips are required for replacement of control boards. Altitude is controlled through dip switch settings and does not require a
program chip. See Use and Care Manual for details.
Commercial Temperature Upgade Kits allow the 66X models to operate at a higher water temperature for commercial applications. The kit includes a
program chip along with a commercial warranty and instructions. Each water heater in a commercial installation would require a kit.
34 | for Rheem, Ruud, Rheem-Ruud, Richmond, EcoSense and Paloma tankless water heaters