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Energy

Condensing boiler

High-performance boiler that recovers heat from flue gases to optimize efficiency.

Full definition

A condensing boiler is a gas or oil heating system that recovers latent heat from combustion flue gases, achieving efficiency above 100% (on LCV). In Belgium, it has been the minimum standard for new installations since 2015. Its 95-109% efficiency (on HCV) makes it significantly more economical than a conventional boiler (80-90%). Regional grants encourage installation: up to EUR 1,000 in Wallonia and Brussels.

Related terms

Energy renovation

Works aimed at improving a building's energy performance.

EPC certificate

Document certifying a building's energy performance, mandatory when selling or renting.

Heat pump

Eco-friendly heating system that draws energy from air, ground, or water to heat a building.

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High-performance boiler that recovers heat from flue gases to optimize efficiency.