OEM replacement inline water flow sensor for Suburban ST-42 and ST-60 on-demand water heaters, detecting water movement to trigger ignition.
The Suburban Mfg 233665 is an OEM replacement water flow sensor for the Suburban ST-42 and ST-60 water heaters. Installed inline, it detects water flow automatically with no manual input required, adjusting dynamically as flow changes, without restricting flow direction or impeding water travel. Its slim profile fits neatly within existing pipe sections, with a straight internal bore for uninterrupted flow and a non-metallic exterior suited to damp operating environments. Clearly labeled inlet and outlet ends help ensure proper alignment during installation.
This is a water flow sensor, distinct from Suburban's low air flow switch (part #233658), which also fits the ST-42/ST-60 water heaters but monitors combustion air flow instead of water flow. Confirm which sensor type needs replacing before ordering, since the two are easy to mix up given the similar part numbers and shared compatibility.
• (1) Suburban Mfg 233665 water flow sensor