Applications involving ammonia require specific stainless steel or ammonia-compatible pressure control models

this low pressure switch ensures your unit heater maintains peak combustion efficiency and meets strict safety protocols

ensuring a flush horizontal mount without additional modifications

this wye strainer provides exceptional corrosion resistance

and system regulation applications

Lennox 81W03 Control Board Els PW 17895 Applications involving ammonia require specificThe Lennox 81W03 Control Board is the direct OEM replacement for the Lennox 17W70, 17W7001, and 81W0301 ignition control boards. As the central logic for your furnace, this integrated furnace control manages critical sequences, including hot surface ignition, flame sensing, and blower motor timing. It is engineered specifically for use in high efficiency units such as the Lennox G40, G43, and ML180 ML193 series. When performing a field replacement,