"In the absence of a statute or covenant to the contrary, the lessor does not have a duty to keep in repair any portion of the premises leased to and in the exclusive possession and control of the lessee." Thomas v. Roper,162 Conn. 343, 348, 294 A.2d 321 (1972). This common law principle is significantly modified by General Statutes 47a-72which, among other things, *Page 606
requires the landlord to "make all repairs and do whatever is necessary to put and keep the premises in a fit and habitable condition . . . [and to] maintain in good and safe working order and condition all electrical, plumbing, sanitary, heating, ventilating and other facilities and appliances . . . supplied by him