Weil McLain 633-900-130 Residential Thermostat Refrigerant eliminating the risk of bypass

eliminating the risk of bypass air or environmental contaminants interfering with sensitive bimetal sensing elements

Constant Duty Performance: Specifically designed for intermittent and continuous ignition cycles without overheating

System Reliability: Minimizes thermocouple dropouts and ignition delays by providing a steady heat source for the flame sensor

This right-angle mount actuator operates within a standard 8-13 PSI spring range

Always verify the motor's directional arrow before installation

Weil McLain 633-900-130 Residential Thermostat Refrigerant eliminating the risk of bypassWhen 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