Condensing Boilers are ideal for Under floor Heating systems. One of the elements in both Natural Gas and Propane is hydrogen. A gas burning appliance mixes the gas with air and during the combustion process hydrogen and oxygen combine together and produce heat (143,100kJ/kg) and water vapour (H₂O).

For every kg of hydrogen burned 9kg of water vapour is produced. The temperature in the heat exchanger of a boiler can reach 1400⁰C. The water vapour produced is so hot it turns into superheated steam.