| 摘要 |
<p>A method of and apparatus for heating a space such as a room, work place or tie like comprising a gas or oil-fired burner, a heat exchanger and a fan arranged to blow air from the heat exchanger into the space and which is operable at high and low speeds. A first adjustable thermostat serves to control the output of the burner so that the temperature of the heated air remains substantially contant and a second adjustable thermostat, having upper and lower settings, is arranged to control the burner and the speed of the fan depending on the temperature of the space being heated.</p> |
