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

Expandable Design: Ships in a collapsed format for easy storage and expands easily into the existing cabinet guide rails

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

and the "20" is the temperature differential

reliable installation that restores system efficiency and meets original equipment manufacturer specifications for sound levels and stability in demanding environments

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