Your boiler is used for heating your home and heating your water and as both of those thing contribute to your overall energy bills, it is certainly in your interests to have a boiler which is as energy efficient as possible.
In fact, it is estimated that during the cooler months, your heating costs can account for 60% or more of your energy bills.
Reducing energy costs is a priority for many households and one of the best ways is to replace a boiler if it is more than 15 years old. However, it is important to make the best choice of boiler and to get the most energy efficient one you can afford.
How efficient is my boiler?
In the UK it is actually law that all new boilers must be at least 88% efficient and this legislation has been in place since 2010. In fact you can buy boilers which are even more efficient than this. If you replace a boiler which is more than 15 years only you can expect to see a huge difference in your heating bills even if you only buy the least efficient model available.
Boilers are rated for the efficient using a scale known as the Sedbuk rating. Older boilers made before 2005 use a letter rating (A-G with A rated boilers having at least 90% efficiency). Newer boilers will use a percentage rating allowing you to easily compare boilers from all manufacturers.
What makes a new boiler more efficient?
All new boilers are condensing which is the main reason they are more efficient than the older style boilers. A condensing boiler has a larger heat exchanger which results in more of the fuel being burned and the heat recovered more efficiently. The cooler gases are sent out the flue which causes condensation (hence the name). This is the cloud of vapour you see coming from your gas flue at certain times of the day. Even more energy is recovered from this vapour, allowing the energy efficiency to improve even more.
How much will my new boiler save me?
The amount you will save depends entirely on the rating of your old boiler and if you are replacing a condensing or a non-condensing boiler. The size of your home is also worth taking into account. However you can expect to make savings of around 25% based on a boiler which is at least 15 years old. This calculates to around £300 per year.