Steam

Water in vapor form; used as the working fluid in steam turbines and heating systems. Also see District heat.

Steam, purchased for use by a refinery, that was not generated from within the refinery complex.

A distribution system where steam or hot water circulates through cast-iron radiators or baseboards. Some other types of equipment in the building may be used to produce the steam or hot water or it may enter the building already heated as part of a district hot water system. Hot water does not include domestic hot water used for cooking and cleaning.

Either of two types of a central space-heating system that supplies steam or hot water to radiators, convectors, or pipes. The more common type supplies either steam or hot water to conventional radiators, baseboard radiators, convectors, heating pipes embedded in the walls or ceilings, or heating coils or equipment that are part of a combined heating/ventilating or heating/air-conditioning system.The other type supplies radiant heat through pipes that carry hot water and are held in a concrete slab floor.