Find the part you need on the exploded parts diagram for the Suburban ST42 (ST-42) 42,000 BTU tankless RV water heater. The module board, gas valve, electrode, water flow sensor, control center, sensors and limit switches are all here. Click a red number to go straight to that part in our store. Every Suburban part number is listed in the table below the diagram.
Need the outside door? We carry the Suburban ST-42 / ST-60 access door 6285 in black or white. Not sure which part fits? Contact us with your model and serial number and we will confirm it before you order.
Suburban ST42 Tankless Water Heater Parts
| # | Part | Fits | |
|---|---|---|---|
| 1 | Module Board Lid Part # 90722 |
ST42 (ST-42) | Ask us |
| 2 | Module Board Housing Part # 90721 |
ST42 (ST-42) | Ask us |
| 3 | Module Board (now sold as 521338) Part # 233666 |
ST42 (ST-42) | View part |
| 4 | Gas Valve Part # 161357 |
ST42 (ST-42) | View part |
| 5 | Airflow Sensor Part # 233658 |
ST42 (ST-42) | Ask us |
| 6 | Limit Switch, Manual Part # 233676 |
ST42 (ST-42) | Ask us |
| 7 | Limit Switch, Antifreeze Part # 233675 |
ST42 (ST-42) | Ask us |
| 8 | Flame Sense Part # 233681 |
ST42 (ST-42) | Ask us |
| 9 | Electrode Assembly Part # 233667 |
ST42 (ST-42) | View part |
| 10 | Regulator, Two Stage Part # 233687 |
ST42 (ST-42) | Ask us |
| 11 | Water Flow Sensor Part # 233665 |
ST42 (ST-42) | View part |
| 12 | Temp Probe, Female Connection Part # 233684 |
ST42 (ST-42) | Ask us |
| 13 | Temp Probe, Male Connection Part # 233683 |
ST42 (ST-42) | Ask us |
| 14 | Pressure Relief Valve Part # 521317 |
ST42 (ST-42) | Ask us |
| 15 | Control Center Part # 233678 |
ST42 (ST-42) | View part |
| 16 | Gas Inlet Part # 172305 |
ST42 (ST-42) | Ask us |
| 17 | Water Inlet Pipe Part # 172304 |
ST42 (ST-42) | Ask us |
| 18 | On/Off Switch & Fuse Assembly Part # 233700 |
ST42 (ST-42) | Ask us |
| 19 | Fuse, 7 Amp Part # 233682 |
ST42 (ST-42) | Ask us |
| 20 | Seal Ring Kit Part # 521316 |
ST42 (ST-42) | Ask us |
| 21 | Adapter Fitting 1/2" BSPP to MPT Part # 172318 |
ST42 (ST-42) | Ask us |
Diagram and part numbers are from Suburban’s ST42 parts list. Red numbers link to parts we carry. Confirm fitment with your model and serial number before ordering.