The steatite radiators may be heated on gas, gasoline, denatured alcohol, oil, electric, coal or wood stoves or ranges. Care should be taken that the radiators are not allowed to become red hot.

The time required to give the radiators the necessary temperature is from ten to twenty minutes, depending, of course, on the size and intensity of the blaze used and the amount of heat required. Much less heat is needed for baking a cake than for roasting a large piece of meat. Judgment must be used. The radiators should be tested as one would test a sad-iron. For boiling and steaming, only moderate heat is required, while for roasting meat it is necessary to have the radiators very hot.

With very little trouble, considerable fuel and time, may be saved by keeping the radiators moderately warm. In the summer time they may be placed out of doors in the sun, if convenient. They will then require only a few minutes' heating over a flame. In the winter they may be placed in a window where the sun will strike them; or better still, on the back of a range or a heater. If an asbestos plate, such as is used with an ordinary gas stove, is placed over the radiators, they will heat more quickly.

Caloric steatite radiators are as good an absorbent of cold as they are of heat. When a radiator is cold it should be heated gradually until thoroughly warm and then it may be subjected to the most intense heat.

Steatite is a natural product and contains seams which may open up when the radiators are heated. The radiators may also chip or flake. This does not affect their utility in any way whatsoever. On the contrary, a seam or crack will cause a radiator to heat up more readily, thereby lessening the expenditure for fuel. The Caloric guarantee does not cover the chipping or cracking of radiators.

If they become greasy or soiled, they may easily be made as good as new by the use of sand paper or any scouring soap.