Boiler Efficiency Ratings (SEDBUK)

Boiler Efficiency Ratings (SEDBUK)

Why is Boiler Efficiency Important?

Boilers account for around 55 per cent of your yearly annual energy bills, so improving your boiler’s efficiency could make a big difference to your household costs. Efficient boilers produce less C02 and use less fuel, which in turn helps to cut your heating bills.

As of 2010, all new boilers installed in domestic premises must have a boiler efficiency rating of 88% or above. However, it is estimated that the average boiler efficiency across the UK is only 60%. This is largely due to high numbers of older boilers and the fact that many households avoid booking an annual boiler service, which typically improves the efficiency of both old and new boilers.

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How Boiler Efficiency Ratings are Calculated in the UK

Boiler efficiency in the UK is measured by a system called SEDBUK (the Seasonal Efficiency of Domestic Boilers in the UK). This method, which involved measuring how efficient a boiler is at converting gas or oil to heat, also takes into account typical condition that are found in the UK, such as weather patterns, types of buildings and heating controls.

In 2014, SEDBUK was incorporated into SAP (Standard Assessment Procedure for Energy Rating of Dwellings), to help directly compare the energy efficiency of different appliances and structural elements within a building.  

About SEDBUK Boiler Efficiency Ratings

SEDBUK was initially created by the government (in partnership with boiler manufacturers) to work as an industry benchmark under the ‘Energy Efficiency Best Practice Programme’ in 2005.  The rating was designed to give manufacturers and homeowners an accurate basis to compare energy performance for different types of boilers, by showing their efficiency on a scale of A-G. However, in 2009 the ratings were changed to percentages, to reduce confusion when comparing efficiency with European energy labels (which also use percentage ratings).

See How the SEDBUK 2005 and 2009 Ratings Compare Below:


SEDBUK ratings

On the scale, bands A to B (86% and above) are classed as ‘highly efficient’ while bands C to G (82% and below) are classed as ‘standard efficiency'. As of 2010, all new boilers installed in domestic premises must have a boiler efficiency rating of 88% or higher.

How Efficient is Your Boiler? 

If you’re wondering how efficient your boiler is, there are a number of ways to find out. The first is by checking your boiler manual, however, it is worth bearing in mind that boiler efficiency declines over time, so if your boiler is more than a few years old the original rating may not still be valid.

You can also check online for efficiency rating tools or if you recently bought your home, you can search for energy efficiency details on the property listing.

Save Money by Improving Your Boiler Efficiency Today! 

If you’d like to improve your boiler efficiency and cut your household bills, check out our top tips page. However, the easiest way to quickly improve your boiler is by booking a boiler service with a qualified engineer.


Simply click below or call our Customer Services team on 0800 080 7875 to find trained, trusted engineers in your area and get a free, instant service quote today!


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