Lochinvar & A.O. Smith 100276287 Thermostat 319847-401 The M611 is a dedicated

The M611 is a dedicated modulator that requires a separate upstream pressure regulator

With a maximum pressure rating of 400 PSI and a rugged plated steel frame

mitigating issues such as flame instability or frequent ignition failures

the 342970-75101 is the official manufacturer-designated supersession

If your diagnostic shows line voltage at the solenoid but no inductive "click" or magnetic field

Lochinvar & A.O. Smith 100276287 Thermostat 319847-401 The M611 is a dedicatedThe Lochinvar & A. O. Smith 100276287 Thermostat is a high precision K Gas Thermostat MFG H CONV designed for professional grade temperature regulation in commercial and residential water heating systems. Engineered as a direct OEM replacement part, this manual reset gas thermostat effectively manages heat levels by modulating the gas supply based on real time fluid temperatures. It operates within a precise 40F to 120F temperature range, ensuring