Our house is heated with natural gas (our hot water is also heated with natural gas).
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The appropriate gas is burned in the gas burner, and it can be fed into the burner at any time due to a slight overpressure of the gas pipe. The resulting heat is transferred via a heat exchanger to the ready heating water of the natural gas heating system and then pumped along with the water via a circulation pump to the radiators. The radiators then release the heat generated into the environment. Meanwhile, the cooled water flows back to be heated again. (https://www.thermondo.de/info/rat/gas/warum-ist-eine-erdgasheizung-so-gefragt/)
