Watts 0163725 Valve 321894-709 it should only open when

it should only open when the 170°F threshold is reached

Extreme Temperature Resilience: Engineered to operate in ambient temperatures ranging from -40°F to 205°F

preventing "hunting" and thermal cycling in large hydronic loops

it enables the proportional control necessary for air handling units

this specific part is designed for select 6-cell models

Watts 0163725 Valve 321894-709 it should only open whenThe Watts 0163725 is a high capacity commercial temperature and pressure relief valve designed specifically for large scale hot water heaters and supply tanks. This 1 inch Watts 40XL 4 150 unit features a 4 inch extension thermostat with a specialized thermo bonded coating to minimize mineral buildup and ensure consistent thermal response in rigorous environments. Rated for a steam discharge capacity of 2,134,000 BTU hr (ASME), it provides essential