Broad Compatibility: Supersedes multiple older part numbers including LH33ZS001A and 332505-751

you should adjust the air pressure to match your boiler fill valve setting (typically 12–15 PSI) while the tank is empty or isolated from system pressure

When diagnosing a loss of hot water or high amperage draw

Featuring a 3/4" FNPT inlet and a 3/4" FNPT outlet

Rated for 300 degrees Fahrenheit

Johnson Controls T26S-18 Thermostat 30067439-890 Broad Compatibility: Supersedes multiple olderThe Johnson Controls T26S 18 is a heavy duty line voltage wall thermostat engineered for precise control in both heating and cooling applications. This SPDT thermostat features a rugged bimetal sensing element to ensure accurate temperature regulation within a 40? F to 90? F range. Designed for high amperage electric heat or fan coil units, it operates without an external selector switch, relying on its internal switching logic to manage loads.