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User Manual Mr. Heater F260550 Big Maxx 50,000 BTU Dual-Fuel Forced Air Garage Heater · US: MHU unit heaters are to be used with NFPA- or ANSI-approved chimneys, 2020 Convection Propane 80-200k BTU Industrial Heater Manual. (Size: 2.5 MB) 2019 Forced Air Propane 85-125k BTU Industrial Heater Manual. View and Download Mr. Heater Big MAXX MHU125 operating instructions and owner's manual online. COMPACT UNIT HEATER FOR RESIDENTIAL/COMMERCIAL USE. MHU 50. MHU 80. MHU 125. ®. COMPACT UNIT HEATER. FOR RESIDENTIAL/COMMERCIAL USE stand the installation, operation, and service in this manual. Ensure the manifold pressure is set per the installation manual. If manifold pressure is If setup for Propane, the inlet gas pressure switch my be open.PARTS/MANUALS. Please call our Service Department at 1-800-251-0001, where our technicians will gladly assist you. To order Service Parts in Canada, Installer: Leave this manual with the appliance. MHU 50/80/125 unit heaters are equipped with an automatic spark ignition system. There is no pilot.