apg gas heater

Beginning in 1881 the burner's flame was used to heat a structure made of asbestos, a design patented by Sigismund Leoni, a British engineer. Later, fire clay replaced the asbestos because it is easier to mould. Modern mobile gas heaters still work this way although using other refractory material，Flued heaters would always be permanently installed. The flue, if properly installed with correct overall height, should extract most heater emissions. A correctly operating flued apg gas heater is usually safe