Capacitive gas furnaces. The gas most often used for economic and industrial purposes is a product of dry distillation of solid fuel. Due to the price, gas is not widely used for permanent home heating, but only as occasional heating. In Poland, thanks to the construction of gas pipelines, it will soon be possible to use cheaper natural gas on a larger scale. Positive properties of gas heating, compared to heating with other fuel, above all, it is easy and cheap to install the pipeline and burners. A gas burner can be made very simply from a 3/4 tube″, finished with a greater or lesser, depending on the size of the furnace, a ring provided with holes in its upper part 2 1/2 into 3 mm at a distance of every 5 Cm. The burner should be so designed, so that it does not cause difficulties when inserting and removing it from the furnace hearth. In addition, the burner should be equipped with a valve that enables hermetic closure after the furnace has heated up.

Tiled stove with gas fire (design by Ing. Birszenka)

The picture shows a tiled stove of the author's construction with a hearth, on gas. The interior of the furnace is filled with chamotte Rashing rings. This type of oven may be portable or mobile.

A gas stove has a lot of positive properties:
a) does not require troublesome activities when firing up,
b) there is easy regulation of the smoking process,
c) there are hardly any combustion losses even with completely primitive fireplaces,
d) a polluted room has a minimum content of non-flammable admixtures (about 2 up to 2.5'%),
e) when using the device, there is no waste polluting the room and requiring disposal,
f) no place to store fuel is needed.

The disadvantages of gas heating include:
a) high operating costs,
b) possibility of poisoning,
c) the possibility of an explosion in combination with certain proportions of gas and air.

The presence of gas from the gas plant signals its specific odour. Chemical admixtures that irritate the smell are added to the natural gas in the places where it is extracted, therefore it can also be felt in the event of leakage in the pipes.
The use of gas is developing on a larger scale; oil shale deposits are used for its production. Operation is also planned and started on a larger scale in Poland, peat, as this branch of technology develops, peat may also be exploited for gas production.
The gas is also used to fire central heating boilers and for combustion in local individual devices and apparatuses. In both cases, the exhaust gases must be discharged into the flue pipes, which may have a smaller cross-section than for coal-fired stoves. The gas combustion process does not require a blast, since the gas pressure at the inlet to the furnace is from 25 into 40 mm of water column. So not only is it unnecessary to enlarge the thrust, but on the contrary, it can be harmful, because it reduces the combustion temperature.