Every dwelling shall have heating facilities which are properly
installed and are maintained in safe and good working condition and
are capable of safely and adequately heating all habitable rooms,
bathrooms and water closet compartments in every dwelling unit located
therein to a temperature of at least 68° F. at a distance of 18
inches above floor level under ordinary winter conditions.
No owner or occupant shall install, operate or use either an
unvented or unventable heater employing a flame.