operating reliably between -40°F and 140°F

including the RTHA and RTHB series equipped with CHHA model compressors

Built-in internal check valve enables seamless bi-flow operation

the 8620-156 circuit board ensures precise communication between the thermostat and mechanical components

Burnham Boiler 81156012 Filter THPU32HP7Y operating reliably between -40°F andThe Burnham Boiler 81156012 Filter is a critical OEM replacement air filter specifically engineered for high output combustion systems, including the Evolution Series EV 2000 and EV 2000S. Built to handle the rigorous demands of commercial heating applications, this filter utilizes a heavy duty paper filter core coupled with a specialized poly pre filter to maximize particle entrapment. Proper combustion airflow is essential for maintaining a stable