and Tempstar furnaces

matches these specs before installation

specifically engineered for saturated steam service up to 50 PSI

This Marley thermostat is verified for use with QMark and Berko models DH1521D

Relying on an oil pre-heater temperature switch that meets exact engineer specifications is the only way to ensure the combustion head doesn't overheat or underperform

Aprilaire 401 Filter 30067439-890 and Tempstar furnacesThe Aprilaire 401 Filter is a high performance MERV 10 replacement media designed specifically for the Aprilaire model 2400 and 2410 whole home air cleaners. Engineered to maintain low pressure drop and high dust holding capacity, this filter effectively captures airborne contaminants such as pollen, mold spores, and common household dust. As a direct replacement for FR1400U 108, it ensures seamless compatibility without the need for additional