With up to 125,000 BTU of output, the Proheat M-Series is an ultra-powerful, cold weather auxiliary heating solution for buses and coaches. This diesel-powered heater preheats the engine to ensure quick and reliable starts while reducing engine wear. Proheat M-Series heaters are also powerful enough to supply supplemental interior heat for passenger and driver comfort while the main engine is running. The heater is designed to be accessible and easily serviced by technicians to help minimize down time. CAN Bus connectivity means the heater can be seamlessly installed on vehicles that rely on the J1939 network standard. Trusted in the transit industry for years, Proheat M-Series heaters are installed on buses and coaches across North America.