this unit is still the designated replacement

A common failure mode in older units is insulation breakdown due to thermal cycling

Can this switch be used for both vacuum and pressure

making it a staple for contractors managing critical HVACR steam systems where durability and exact pressure reduction are non-negotiable

Lochinvar & A.O. Smith 100275532 Gas Valve Assembly 320735-701 this unit is still theThe Lochinvar and A. O. Smith 100275532 Gas Valve Assembly is a critical combustion control component engineered for precise fuel metering in high efficiency condensing water heaters and commercial boilers. This negative pressure regulated gas valve (frequently cross referenced with part number 100110300) is designed to maintain the correct air to gas ratio across varying firing rates. Constructed for durability in demanding mechanical rooms, this