Xylem-McDonnell & Miller 158S-HD Head Mechanism W/Snap Switch 178602

The Xylem-McDonnell & Miller 158S-HD Head Mech W/Snap Switch 178602 seems to be a replacement part for hydronic heating equipment, most likely boilers, and water level control systems. The term "head mech" most likely refers to the primary component of the water level control mechanism, which is in charge of keeping an eye on and adjusting the boiler's water levels. The snap switch is a fast-acting switch that operates in response to readings of the water level. The snap switch may shut off the boiler to avoid overheating and damage when the water level drops below a safe threshold. In contrast, if the water levels drop too low, the switch may also cause other activities, such as replenishing the boiler. maybe found in other hydronic heating systems that require comparable water level management.keeps boiler damage from occurring from overheating brought on by low water levels.