this model is the direct replacement for 51H25

and digital thermostats without overloading

and Intertherm units

F range to prevent overheating

Hydrolevel 1150 Low Water Cut-Off Els PW 17895 this model is the directThe Hydrolevel 1150 Low Water Cut Off is a specialized 120VAC safety control engineered for residential hot water boilers. Designed to provide critical protection against dry firing, this Safgard 1150 model utilizes a non moving electronic probe to monitor water levels. In a low water condition, the 1150 immediately interrupts the burner circuit to prevent catastrophic equipment failure. As an automatic reset LWCO, it restores power to the burner once