Regulation 12 Heating
Except in ships employed solely within the Tropics or the Gulfs area, all sleeping rooms, mess rooms, day rooms, recreation rooms, rooms for watching films and television, hobbies and games rooms, offices, studies, sanitary accommodation and hospitals shall be installed with a main heating system capable of ensuring that when—
the ventilation system provided for the room or crew accommodation is working so as to supply at least 25 cubic metres of fresh air per hour for each person whom the room or crew accommodation is designed to accommodate at any one time; and
the temperature of the ambient air is−1°C;
the temperature in that room or crew accommodation can be maintained at 21°C.
The main heating system shall be operated by steam, hot water, or electricity, or shall be a system supplying warm air.
Means for turning on or off or varying the heat emitted by a radiator or other heating device without using a tool or key shall, wherever reasonably practicable, be provided in the space in which that radiator or other device is fitted. All heating equipment shall be so constructed that its operation is not affected by the use or non-use of propelling machinery, steering gear, deck machinery, calorifiers or cooking appliances.
Subject to subparagraph (b) below, the crew accommodation shall be heated by means of the main heating system at all times when any members of the crew are living or working on board and the circumstances are such that heating is required.
Heating by means of the main heating system need not be provided when the vessel is in port if such parts of the crew accommodation as are then in use are provided with a safe and efficient temporary means of heating capable of ensuring the standard required by paragraph (1).
Heating equipment shall be so constructed and installed, and if necessary shielded, as to avoid risk of fire or of danger or discomfort to the crew.