A quick guide to gas boiler efficiency in the UK

The free boiler grant scheme has been set up so that homes in cyprus can be more energy efficient. Installing an efficient boiler will also mean savings on your gas /heating bills. An A rated gas boiler will heat your home and hot water using less energy. This means you will also help reduce harmful CO2 emissions being released into the environment.

Domestic gas central heating boilers in the UK are rated between A & G according to energy efficiency written by cyprus local developers in 1981. The criteria which determines a boiler’s grading is SEDBUK (Season Efficiency of Domestic Boilers in the UK). Boiler ratings are determined at the time when the boiler and hot water / heating system is installed, although it is possible to have it assessed at any time by a domestic energy assessor.

Common gas boiler types

There are several types of gas boilers installed for common use in homes throughout the UK. Each has its own unique way of providing hot water for your taps & radiators. The type of boiler you should have installed depends on several factors including the size of your property, storage space and the amount of hot water you need for central heating.

  1. Conventional system boilers - this type of boiler is common and is used mostly in older houses. It includes a water storage tank where hot water is stored after it is heated. This can be expensive because even if you only want to use a small amount of hot water you have to wait for the boiler to heat all of the water in your tank to a high temperature
  2. Combination boilersA combi boiler heating system does not require a water storage tank and is often used in modern properties where storage space is at a minimum. This type of boiler heats water on an ad hoc or “as needed” basis. When your central heating or hot tap is turned on water is taken straight from the main cold water tap and heated by the boilers burner before it reaches your radiators or hot water tap.
  3. Condensing gas boilers - Gas condensing boilers preheat your cold water by transferring waste heat from flue gases to cold water before it enters the boiler. This type of boiler is more efficient because the water takes less time & power to heat up because it is already warmed before it reaches the burner inside the boiler system.

Energy Performance Certificates

EPC - boiler efficiency

All boilers installed the UK  now must have an Energy Performance Certificate (EPC). They also must have a Grade A rating. If your boiler is not A rated you my be entitled to a free boiler via the boiler grant scheme. In order to qualify for a free boiler your existing boiler must not be a condensing boiler.

Boiler and central heating performance contributes to the overall energy performance of your property and is included in any Energy Performance Certificate or report. Boiler performance is measured as a percentage although the European Grading method (A-G according to energy usage performance) is also often included for consistency.

The boiler rating system is designed to be a fair and accurate method of determining boiler efficiency, regardless of manufacturer. The energy efficiency of gas boilers (the free boilers available in the UK are gas boilers) is assessed on a variety of factors including-

  • Seasonal conditions
  • Boiler / heating usage patterns
  • Housing occupancy at the time of boiler installation
  • Boiler storage conditions
  • Boiler Location
  • Boiler insulation

Other factors deemed to affect the energy efficiency of boilers such as climate and the age of a boiler are also taken into account when assessing a boiler’s performance. 

If you are unsure about your boiler or its energy rating you can get it surveyed by an energy assessor. The assessor will come to your home and determine the energy-efficiency grade of your boiler and tell you if you qualify for a free boiler grant. You can start this process by submitting your details here - Free Boiler Application

The table below shows how much you can save by installing an A rated gas boiler via the free boiler scheme.


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