Heating and Boilers

If your boiler is more than 10 years old it may be time to consider replacing it with a newer, more energy efficint gas boiler.

energy efficient boiler

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Energy Efficient Boilers

If your boiler is more than 10 years old it may be time to consider replacing it with a new, energy efficient boiler.

Modern central heating condensing boilers are a lot more efficient than conventional non-condensing boilers. Non-condensing boilers waste between 30% to 50% of heat, as a result of combustion gasses escaping into the flue. However, a condensing combi boiler, in contrast, can be up to 99% efficient. 

They can heat water more efficiently, meaning they use less gas or oil to do the same job. This saves energy and will save you money. In fact, if your boiler is over 10 years old, then it’s probably worth investing in a new one. In most cases the savings you make from a more efficient boiler over the years will likely pay for the outlay. Building regulations stipulate that if you are replacing an old boiler, the new appliance must be A-rated for energy efficiency. This means it must be at least 88% efficient (most new boilers score over 90%).

In a typical semi-detached property that uses mains gas for heating you can reduce your heating bills by around £300 per year if you upgrade from an old G-rated boiler (less than 70% efficient) to a new A-rated condensing boiler with full heating controls (e.g. timer/programmer, room thermostat and thermostatic radiator valves). The savings are even greater for larger properties and for heating systems that run on oil which is more expensive than gas.

The costs for replacing a boiler will vary, but a straightforward gas combi boiler replacement, including thermostatic radiator valves (TRVs) will typically cost from around £1500 to £2500 depending on the make and model of boiler, the size of the boiler and the location of the boiler in the property.


If the boiler in your property is less than 86% efficient (most boilers over 7 years old are <86% efficient) PLUS you or somebody else in your property is receiving certain tax credits or benefits, then you may be eligible to receive funding towards the cost of a new condensing boiler. The amount of funding available is calculated based on the amount of carbon dioxide that would be saved by replacing the existing boiler with a new energy efficient boiler. This typically varies from 50% funding up to 100% funding for larger properties. Please note that this funding is currently only available for homeowners and landlords are unable to apply.

Please contact us on 0330 223 0333 and one of our helpful team will be able to advise you whether you will qualify for replacement boiler funding.

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