The MFH900 flameless heater provides safe and reliable heat for Oil and Gas, Mining, Construction, Utility projects and more. Generac Mobile's flameless heat technology delivers heat without an open flame for use in hazard zone areas in which ignitable flames may be present. The MFH900 includes a brand new design for enhanced safety, serviceability and ease-of-use. POWERFUL : 4.4 L Perkins® engine, FT4 , 865,000 BTU output* , Max temperature output 180°  F (82° C) . 88%+ heater efficiency , Hydraulic pump loop generates reliable heat in ambient temperatures down to -40° F/C , Rust-proof aluminum enclosure , 26-hour run time on one fuel and DEF fill