Any system of warming must include, first, the combustion of fuel which may take place in a fireplace, stove, steam or hot-water boiler; second, a system of transmission, by means of which the heat may be carried, with as little loss as possible, to the place where it is to be used for warming, and third, a system of diffusion, which will convey the heat to the air in a room and to its walls, floors, etc., in the most economical way.


The simplest and cheapest form of heating is the stove. The heat is diffused by radiation and convection directly to the objects and air in the room, and no special system of transmission is required. The stove is used largely in the country and is especially adapted to the warming of small dwelling houses and isolated rooms.