Industrial-Grade Thermal Performance: Built to withstand the high ambient temperatures of a boiler cabinet while maintaining efficient power transfer

allowing for clean

as newer OEM HVAC control boards may feature updated footprints to accommodate advanced circuitry

the unit utilizes a silicone diaphragm capable of handling air and common combustion byproducts without degradation

Weil McLain 633-900-130 Residential Thermostat Refrigerant Industrial-Grade Thermal Performance: Built toWhen you're servicing or installing Weil McLain Plus or Gold Plus series indirect fired water heaters, maintaining thermal accuracy is non negotiable for system longevity and prevents short cycling. The Weil McLain 633 900 130 Residential Thermostat kit is an essential OEM replacement part designed for a precise operating range of 90F to 160F. This aquastat control integrates directly with factory configured drywells, ensuring the sensor bulb makes