Water Flow Sensors
SUBURBAN · RV WATER HEATER PARTS
Suburban Water Flow Sensors
2 Suburban water flow sensors for RV water heaters. Tells a tankless unit that water is flowing so it can light.
✓ FIT CHECK
Not sure which part fits? Send us your model and serial number from the data plate and we’ll confirm it before you order.
Shop by part number
Part # 233665Water Flow Sensor →Fits ST42 (tankless), ST60 (tankless) 
Part # 233237Water Flow Sensor, Nautilus IW60 →Fits Nautilus IW60Which water flow sensor fits my water heater?
| Part # | Fits these models |
|---|---|
| 233665 | ST42 (tankless), ST60 (tankless) |
| 233237 | Nautilus IW60 |
Not listed? Send us your model and serial number.
Signs it’s time to replace
- Burner never starts with a hot tap open
- Flow-related error codes
- Works only at high flow
Tip: Clean the inlet screen first. Low flow is often a clogged screen, not a bad sensor.
Related parts (these are not water flow sensors): Overheat Sensor, Nautilus IW60 233231, Temperature Sensor 233685.
Common questions
Which water flow sensor fits my Suburban water heater?
Find your model in the table above, or match the part number printed on your old part. Several parts changed at serial number breaks, so send us your model and serial number if you are unsure.
