(f) Supply running water and reasonable amounts of hot water at all times and reasonable heat except where the building that includes the dwelling unit is not required by law to be equipped for that purpose, or the dwelling unit is so constructed that heat or hot water is generated by an installation within the exclusive control of the tenant and supplied by a direct public utility connection.
If there exists a minimum housing code applicable to the premises, the landlord's maximum duty under this section shall be determined by subdivision (1)(a) of this section. The obligations imposed by this section are not intended to change existing tort law in the state.