Hydrolevel Safgard 550SV Low Water Cutoff w/ Manual Reset & Test Button/Light, Shorter Probe - 120V

Hydrolevel low water cut-offs are electrically operated. A probe is installed in the boiler shell or external manifold and is connected to the control unit. Water is used as a conductor to complete the circuit between the probe and the boiler shell. When water is in contact with the probe, the circuit is completed; when the water level drops below the probe, the circuit opens. Hydrolevel controls provide contacts to de-energize the burner circuit in a low water condition. Shorter probe for mounting in standard reducing tees. Reliable Electronic Operation Low Maintenance Easy to Install Inexpensive to Own and Operate 100% Factory Tested