What is a condensing gas boiler?

2026-07-29 09:38:27 Condensing gas boilers are same fuels like gas& oil fired boilers which water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by using waste heat in flue gases to pre-heat cold water entering the gas boiler. Water vapor produced during combustion is condensed into liquid form, which leaves the system via a drain. In many countries, the use of condensing gas boilers is compulsory or encouraged with financial incentives.



Introduction condensing gas boiler briefly

The term 'condensing gas boiler' refers to the fact that the boilers produce condense from time to time. Condensing boilers use heat from exhaust gases that would normally be released into the atmosphere through the flue. To use this latent heat, the water vapor from the exhaust gas is turned into liquid condensate.

In order to make the most of the latent heat within the condensate, condensing boilers use a larger gas fired boiler heat ex-changer, or sometimes a secondary heat ex-changer.

Due to this process, a condensing gas boiler is able to extract more heat from the fuel it uses than a standard efficiency boiler. It also means that less heat is lost through the flue gases.



Condensing gas Boiler efficiency

XHJ is a professional and reliable manufacturer of condensing gas boilers which the boilers are at least 90% efficient, meaning that they turn 90% of the fuel they use into heat. XHJ condensing boilers achieve the highest possible efficiency category in the industry, featuring energy-saving, low-consumption and eco-friendly performance that meet global heating industry standards.



Condensing gas boiler manufacturer in China

XHJ is one of biggest condensing gas boiler manufacturer in China have 20 years professional production and R&D history. With rich different type of condensing boilers covering various heating scenarios for commercial and industrial use, XHJ exported more than 70 country and areas, like Mexico, Iran, Poland, Italy, Vietnam, Indonesia, Malaysia, South Africa, Saudi Arabia Etc. Which got a high reputation and consistent praise from global clients for stable quality and superior service. XHJ Boiler specialize in central heating condensing boilers and can offer extended guarantees as well as one-stop professional advice on new installations, project customization and reasonable prices, being a trustworthy top choice for global condensing gas boiler procurement.