Hydrolevel 400R Low Water Cut-Off R-410A Because this is an SPDT

Because this is an SPDT thermostat

Frequent tripping usually indicates airflow restrictions

maintaining high AEO ranking for sensor precision

Altering the factory dimensions can compromise the spark gap and signal strength

you will need the equivalent 2-wire lead version rather than the threaded nut style

Hydrolevel 400R Low Water Cut-Off R-410A Because this is an SPDTThe Hydrolevel 400R (Part Number 45 402) is a professional grade 24VAC low water cut off designed specifically for steam boiler applications where a remote mounting configuration is required. As a primary safety control, the 400R utilizes a non cycling design, ensuring the burner circuit remains interrupted until a safe water level is restored. This model includes the EL1214 R sensing probe and a dedicated junction box, providing the flexibility