CFR /  Title 46  /  Part 108  /  Sec. 108.213 Heating requirements.

(a) Each accommodation space must be heated by a heating system that can maintain at least 20 [deg]C. (68 [deg]F.).

(b) Radiators and other heating apparatuses must be constructed, located or shielded so as to avoid risk of--

(1) Fire;

(2) Danger; and

(3) Discomfort to the occupants of each accommodation space.

(c) Each exposed pipe in an accommodation space, leading to a radiator or other heating apparatus must be insulated.