A combi-boiler, short for combination boiler, is a type of central heating system that provides both hot water and heating to a home or building. Unlike traditional boilers, which store hot water in a separate tank, a combi-boiler heats water on demand, as it flows through the unit. This means that there is no need for a separate hot water storage tank, which can save space and energy. Combi-boilers are popular in smaller homes or apartments, where space is at a premium, and they are also known for their energy efficiency and cost-effectiveness.
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