Lochinvar & A.O. Smith 100109151 Switch 320788-704 By using OEM components

By using OEM components

Robust Construction: Engineered to withstand the thermal cycling and vibration typical of high-demand hydronic loops

System Safety: Integrated 15-second pre-purge clears residual gases

Its high close-off capability allows it to maintain a tight seal under higher differential pressures

preventing downstream damage

Lochinvar & A.O. Smith 100109151 Switch 320788-704 By using OEM componentsThe Lochinvar & A. O. Smith 100109151 is a critical safety component designed for high efficiency BTH (Best Tankless Hybrid) water heaters and commercial boilers. This Low Gas Pressure Switch is factory calibrated to a 5" WC (Water Column) set point, serving as a primary sentry to ensure safe combustion cycles. In the field, this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions,