Gas as a fuel has not been used to any great extent for the warming of whole buildings, its application being usually confined to the heating of single rooms. Unlike cooking by gas, a gas fire for heating is not as cheap as a coal fire when kept burning constantly. In other ways it is effective and convenient. It is especially adapted to the warming of small apartments and single rooms where heat is only wanted occasionally and for brief periods of time. In the case of bedrooms, bathrooms or dressing-rooms, a gas fire is preferable to other modes of warming and fully as economical. It may be used on cold winter days as a supplementary source of heat in houses heated by stoves or by furnaces. Again, a gas fire may be used as a substitute for the regular heating apparatus in a house, in the spring or fall, when the fire in the furnace or boiler has not yet been started. It is often employed as the only means for heating smaller bedrooms, guest rooms, bathrooms, and for temporary heating in summer hotels where fires are required only on occasional cold days.

Heating By Gas 1000349

Fig. 54.

Heating By Gas 1000350

Fig. 53.

Heating By Gas 1000351

Fig. 55.

The most common form of heater is that shown in Fig. 56. This is easily carried from room to room and may be connected with a gas-jet, after first removing the tip, by means of rubber tubing. The heater is simply a large burner surrounded by a sheet-iron jacket or funnel. Another and more powerful form is the gas radiator, shown in Fig. 57. This is arranged with a flue for conducting the products of combustion to the chimney, as shown in the section Fig. 58. Each section of the radiator consists of an outer and an inner tube with the gas flame between the two. This space is connected with the flue, while the air to be heated is drawn up through the inner tube, as shown by the arrows.

Heating By Gas 1000352

Fig. 56.

Heating By Gas 1000353

Fig. 57.

Fig. 59 shows an asbestos incandescent grate, and Fig. 60 a grate provided with gas logs made of metal or terra-cotta and asbestos. The gas issues through small openings among the logs, and gives the appearance of an open wood fire.