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.
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Q:does this low water cut off come with the probe also
A:Yes, The 650 includes the probe part EL1214
Q:dose this low watercuff off has a half in prob 120 volts going in and 24 coming out
A:This model is either 120v or 24v and comes with only a 3/4" NPT probe.