Lochinvar & A.O. Smith 100109781 Thermostat 321894-709 the switch should be mounted

the switch should be mounted vertically with the pneumatic ports facing down to prevent moisture accumulation in the diaphragm

Built with a rugged cast or malleable iron housing

If the heater’s fan runs but the burners won't ignite

As a veteran-preferred 15 Amp SPDT relay

Lochinvar & A.O. Smith 100109781 Thermostat 321894-709 the switch should be mountedThe Lochinvar & A. O. Smith 100109781 Propane Gas Thermostat is a critical replacement Intellivent gas control valve engineered specifically for high efficiency LP water heating systems. Designed for technical precision, this 100109781 gas thermostat maintains a strict 10. 0" W. C. manifold pressure setting to ensure optimal combustion and thermal stability in residential and commercial propane applications. As an OEM component, it features integrated