maintaining operational efficiency and safety on the job site

Precise Safety Calibration: Maintains a strict 120°F to 140°F operating range to protect the gas furnace from overheating and potential cracks in the heat exchanger

Ensure the switch is set back to 'Auto' after service to return control to the BAS

preventing nuisance drop-outs in residential and commercial heating equipment

supporting dynamic load ratings up to 28

Lennox 36N77 Hot Surface Ignitor maintaining operational efficiency and safetyThe Lennox 36N77 Hot Surface Ignitor is a critical OEM replacement part designed for high performance gas fired combustion systems. Also identified by the identical part number 36N7701, this nitride ignitor is engineered to withstand extreme thermal cycling within residential furnaces and boilers. As a direct fit HSI, it ensures precise gas ignition by delivering a robust heat source that interfaces seamlessly with the furnace's integrated control