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For A-Rated Efficiency and Less Energy Wastage, It’s Time to Consider a Condensing Boiler.

What’s the Right Boiler for Your Home?

A qualified, registered installer will help you to buy an appropriate boiler for your 
home. But first, here’s a little background on boilers: what’s hot and what’s not!

In most cases, the ‘right boiler’ will mean a condensing boiler. In fact, exceptional 
circumstances aside, all new gas and oil central heating boilers fitted in the UK 
must now be condensing boilers by law.

What’s So Good About Condensing Boilers?

As your installer will confirm, condensing boilers can be easily fitted to most new 
and old heating systems. But what makes them better than older, non-condensing 
boilers is their efficiency: they waste far less energy.

Put another way, while poor old non-condensing boilers convert just 60% 
of their fuel into heat, the efficiency rate of modern A-rated condensing 
boilers is at least 90%.

An A-rated condensing boiler will also use a third less fuel than an older boiler 
to provide the same amount of heat - potentially cutting heating bills and CO2 
emissions by a third too. All of which makes condensing boilers the most efficient 
boilers on the market.

What Sort of Boiler DO You Have?

To tell a condensing boiler from a non-condensing boiler, look at the flue that 
sticks out from the outdoor wall adjacent to your boiler - and the type of waste 
heat it lets out into the atmosphere.

A flue is a pipe that takes the exhaust gases generated by your boiler and passes 
them out through the wall or roof - letting them escape into the air. The end of the 
flue is covered by a metal or plastic protective cover, which makes sure that a good 
flow of air is maintained.

If the flue is made of plastic and lets out visible steam when the boiler is 
firing, then congratulations: you are likely to have a condensing boiler already.

If the flue is made of metal and no steam is visible, you are likely to have 
a non-condensing boiler. These older boilers let out much hotter gases that 
are invisible to the naked eye - and would melt a plastic flue.



Boiler Efficiency

How Efficient Are Condensing Boilers?

Obviously the ratings can vary between models, 
but the high efficiency condensing boilers are 
usually within the A and B tiers of the energy 
efficiency chart below.


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