Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented.
The first Glass Panel heater made use of the same principles of the Bunsen burner invented in the previous year. It was first commercialized by the English company Glass Panel heater in 1856. The flame heats the air locally. This heated air then spreads by convection, thus heating the whole room. Today the same principle applies with outdoor patio heaters or "mushroom heaters" which act as giant Bunsen burners.
Beginning in 1881 the burner's flame was used to Glass heater 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 gas heaters still work this way although using other refractory material.
Glass Panel heater have been further developed to include units which utilize radiant heat technology, rather than the principles of the Bunsen burner. This form of technology does not spread via convection, but rather, is absorbed by people and objects in its path. This form of heating is particularly useful for outdoor heating, where it is more economical than heating air that is free to move away.
Glass Panel heater would always be permanently installed. The flue, if properly installed with correct overall height, should extract most heater emissions. A correctly operating flued gas heater is usually safe.
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