Section R. 400.2244 - HeatingRule 244.
(1) Except as provided herein, a family home shall be heated by an approved heating plant. If the heating plant is located in the basement of a family home, standard building material is sufficient for the floor separation which shall include at least 1 3/4-inch solid wood core door or equivalent to create a floor separation between the basement and the first floor. If the heating plant is on the same level with the residents, the furnace room shall be separated from the remainder of the building with materials that will afford a minimum 1 hour protected enclosure. A permanent outside vent which cannot be closed shall be incorporated in the design of heating plant rooms so that adequate air for proper combustion is assured. Space heaters are prohibited.(2) Factory mutual and underwriters' laboratories approved permanent, fixed-type electrical heating, such as recognized panel or baseboard fixed-type may be utilized in any location. In existing homes where an American gas association approved sealed combustion wall heater has been installed in accordance with both the AGA and the manufacturer's recommendations, approval will be given if the unit is located on an outside wall, obtains combustion air directly from the outside and vents products of combustion directly to the outside.(3) Flame-producing water heaters or incinerators shall be installed with the same protection as a heating plant.(4) Storage of combustible materials is prohibited in rooms containing the heating plant, water heater, or incinerator.Mich. Admin. Code R. 400.2244