BXRZ explosion-proof heating fresh air heater unit, wellhead air heating units, mine heating unit is the special equipment used in various mining industry. The device is provided in the outer wellhead master, auxiliary shaft room, fresh air through the winter well wellhead heating air heating unit, added into the underground wellhead so cold northern cold air is heated to a temperature above the freezing point, and thus avoid the wellhead icing creating a safety hazard problem. Wellhead air heating unit consists of an air heater, fan, casing, dampers and other components, the fan into axial fans, centrifugal fans two, users can select according to need. Wellhead heating unit in the heat into steam, hot water, electric heating in three forms, the heat source can be selected according to the site conditions