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A high efficiency boiler is designed to trap the escaping heat and direct it back into heating the home through a process known as “condensing.” In fact, this is why high efficiency boilers may be referred to as a condensing boiler! High efficiency condensing boilers produce heat by burning natural gas or propane fuel.
An 84% efficiency rating for a boiler refers to its Annual Fuel Utilization Efficiency (AFUE). Let me break it down for you:
AFUE is a measure of how well a boiler converts the energy in its fuel to heat over the course of a typical year.
Specifically, it represents the ratio of the annual heat output of the boiler to the total annual fossil fuel energy consumed by the boiler.
An AFUE of 84% means that 84% of the energy in the fuel becomes heat for your home, while the remaining 16% escapes elsewhere (such as up the chimney).
Different types of boilers have varying minimum AFUE requirements:
Gas-fired hot water boilers: 82%
Gas-fired steam boilers: 80%
Oil-fired hot water boilers: 84%
In summary, an 84% AFUE boiler is a good choice for energy efficiency, ensuring that a significant portion of the fuel you use is effectively converted into heat for your home.
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