ensuring the system maintains its original 125 PSI MOPD (Maximum Operating Pressure Differential) for both steam and hot water

If your cabinet accepts a 20x25x5 nominal size and matches the 19-3/4" x 24-3/4" x 4-3/8" actual size

including Natural Gas and Propane

Smith and Lochinvar models requiring natural gas pilot burner assemblies

Lennox 11K51 Conversion Kit 326070-701 ensuring the system maintains itsThe Lennox 11K51 (Model 604888 14) is a critical natural to LP propane gas conversion kit engineered specifically for technical compatibility with Lennox two stage furnaces. Designed for professional field conversion, this kit enables the EL280, SL280, EL296, EL297, and ML296 series units to operate safely on regulated liquid propane. As a genuine Lennox 11K51 conversion kit, it includes high precision components such as 0. 034 inch burner orifices