The importance of having an efficient boiler

These days, everyone wants to reduce their carbon footprint and be more energy efficient - and this is no different when it comes to boilers.

It's worth caring about your boiler's efficiency

A boiler's efficiency relates to the amount of fuel that is converted into usable heat for your home. Not only does having an efficient boiler help you do your bit for the environment, but it can also help save you money and reduce your monthly energy bills.

How do I find out how efficient my boiler is?

For all modern boilers, you’ll find this on the ErP rating sticker either on the boiler or in the pack it came with. If you have an older model, or the sticker is missing, you need to find your model number which will be somewhere on your boiler - usually in the front panel flap. The PCDC database can then tell you how efficient your model is.

What does my ErP rating mean?

ErP, or Energy Related Products Directive is a rating from G to A+++, with A+++ being the best. The better the rating, the more efficient your boiler and therefore the cheaper your energy bills are likely to be (versus having a lower rated model in a similar home).


What boilers are most energy efficient?

Most new boilers are very efficient due to having a modern heat exchanger, which reuses wasted energy, sending it back into the boiler’s system. The good news is that this means almost all modern boilers have an ErP rating of at least A - but this also means it’s harder to compare models and find the most efficient based on ErP alone, so people often refer to the older, more detailed SEDBUK rating system.

What is the SEDBUK rating?

SEDBUK stands for Seasonal Efficiency of a Domestic Boiler in the UK and was the measure of efficiency until ErP took over in 2015. Instead of being a letter-based rating, SEDBUK gives a percentage which measures the amount of energy wasted versus used. For example, a SEDBUK rating of 80% means 80% of the energy produced is used, whilst 20% is wasted. These days, all boiler models must have a SEDBUK rating of 92% or greater, and we only install models which have a rating of 94%.

Will switching to a higher ErP rated boiler save me money on my energy bills?

If you’re switching from a B rated boiler to an A, you won't see much impact on your energy bills. But, if you’re upgrading from a much older model you could see a big change in how much you are spending. As an example, if you live in a semi-detached house and are upgrading from a G rated boiler to an A, you could save around £200 a year on your energy bills. It’s not just about saving money. A more efficient boiler will help to reduce your carbon footprint and do your bit for the planet.


Is there anything else I can do to improve energy use?

You might also want to get a smart thermostat, such as the Worcester Bosch EasyControl or Tado, as they can further help to avoid energy wastage and manage your heating better. Finally, once you have a boiler you should service it regularly to keep it working well and as efficient as possible. You might want to consider purchasing a 3-year service plan when you get a new boiler to check your boiler’s efficiency and maintain its guarantee.