The following spare parts are available for the model number R40 GS20 (120 - 135):
Burners
Controls
| Part name | Also known as |
| 30-13-073 - RMG88 C. BOX ALL |
Conversion Kits
| Part name | Also known as |
| 30-00-886 - BS3D and BS4D LPG Conversion Kit |
Dampers
| Part name | Also known as |
| 3006931 - GS20 Air Flap | |
| 3007206 - G20 Air Damper |
Gas Valves
| Part name | Also known as |
| 39-70-531 - Gs20 On/Off Gas Train Only |
Other Heater Components
| Part name | Also known as |
| 30-06-706 - Electrode Gas | |
| 30-06-709 - Probe - Gas | |
| 30-07-423 - GS5/10/20 Pressure Switch | GS5/10/20 vacuum switch, GS5/10/20 aps / air pressure switch |