If the pressure exceeds

This varies by the boiler's BTU rating

The 3-speed fan control (High

ensuring the valve remains open upon power loss

This specific model is charged for R404A

Lochinvar & A.O. Smith 100111591 Burner 320788-703 If the pressure exceedsThe Lochinvar & A. O. Smith 100111591 is a high performance 14 inch burner assembly specifically engineered for commercial and residential natural gas (NG) water heaters and boilers. This OEM water heater burner features a factory calibrated #39 orifice to ensure precise gas to air mixing, facilitating optimal combustion efficiency and reducing pollutant output. Built to the rigorous standards of Lochinvar and A. O. Smith, this final burner assembly