Atwood GCH66E Gas/Electric Heat-Exchanger Water Heater Parts
The GCH66E uses the GCH family designation for gas/electric heating with engine heat exchange. This original reference covers the serviceable ignition and tank-associated assemblies plus a small electric-components group; the engine coolant loop itself is not enumerated.
Parts pictured in this guide
Select an image for product details, or jump to the numbered diagrams and parts lists. Match the complete appliance model and part number before ordering.
Reading this diagram: Match the diagram callout and Atwood part number to the original component. Check the water-heater model and production revision, and confirm any superseded number before ordering.
GCH66E: Original cabinet and ignition assembly
| Ref. | Manufacturer # | Qty | Original part description |
|---|---|---|---|
| 1 | 90960 | 1 | Flue Box Assembly |
| 2 | 92640 | 1 | Grille Only, New Style Door |
| 2 | 90002 | 1 | Extended Grille-NLA |
| 3 | 91514 | 1 | Door, Col. White - 6 Gal. |
| 4A | 93865 | 1 | Pc Board - Spade Electrode Use 91367 |
| 5A | 93868 | 1 | Electrode (Local Sense) |
| 6 | 93189 | 1 | Wiring Harness For Circuit Board |
| 7 | 91044 | 1 | Elbow 45 Degree 3/8 X 3/8 |
| 8 | 93870 | 1 | Valve, White Rogers Use 93844 |
| 8 | 93844 | 1 | Solenoid Valve, White Rogers See Notes For Use#S |
| 8 | 92078 | 1 | Gas Valve Assembly W/Orifice 6gal |
| 8A | 93243 | 1 | Bracket For 6 Gal Gas Valve Use 94787 |
| 8A | 94787 | 1 | Gas Valve Bracket- One Piece |
| 9 | 91563 | 1 | Orifice Holder |
| 10 | 92742 | 1 | Main Burner Orifice Use Dometic Part# 92743 |
| 11 | 91638 | 1 | Main Burner |
| 12 | 91858 | 1 | Door Hardware Kit |
| 13 | 91928 | 1 | Set Of 4 Corner Brackets |
| 14 | 96010 | 1 | Ring & Gasket |
| 15 | 92220 | 1 | Tank Cover- Bottom Use 93100 |
| 15 | 92221 | 1 | Tank Cover-Top Use 93100 |
| 15 | 93100 | 1 | Tank Cover Kit |
| 15A | 91802 | 1 | Drawn Pan, Electronic |
| 28 | 91447 | 1 | ECO / T-Stat Assy |
| 29A | 91857 | 1 | Drain Plug, 1/2 In. 2 Pack |
| 30 | 91604 | 1 | Pressure Relief Valve, 1/2 Npt 150 Psi |
| 31A | 91859 | 1 | Switch, On-Off, White |
| 31A | 91959 | 1 | Switch, On-Off, Black |
| 33 | 93866 | 1 | Thermal Cut-Off 190 Degree |
| NS | 90145 | 1 | Fuse, 2 Amp Mini |
| NS | 91592 | 1 | Inner Tank |
GCH66E: Electric element and safety components
| Ref. | Manufacturer # | Qty | Original part description |
|---|---|---|---|
| 16 | 91092 | 1 | 110 VAC On/Off Switch 6 Gal |
| 17 | 91853 | 1 | Electric Tstat, 110v |
| 18 | 91580 | 1 | 110 VAC Bolt-On Element - 1500w |
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