The energy label
Boilers sold in the UK carry an energy label showing their efficiency class for space heating and, for combis, hot water. Most new condensing gas boilers achieve an A rating for heating, so the label alone doesn't separate most models.
What really affects efficiency
Real-world efficiency depends on more than the label:
- Correct boiler sizing for the home
- Flow temperature settings that let it condense
- Good controls, such as a programmable thermostat and TRVs
- A clean system with inhibitor and a filter
- Regular servicing
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Comparing boilers
When comparing quotes, look at the boiler's output range, the warranty, the controls included and how easy it is to service. A well-installed mid-range boiler can perform as well in practice as a premium one installed poorly.
