Portrait photo of Mike Bryant, AKA Mike the Boilerman

Mike the Boilerman -

Your Gas Safe Registered boiler 

and central heating repair technician for 

London, Thames Valley and south coast

Call or text my mobile for service or repairs to your gas boiler or central heating system 

07866 766364 

Gas Safe Register Logo 2

Search my site

Find me and other re-commended 

local tradesman in 

The Directory of Excellence

Directory of Excellence logo - find recommended local tradesmen

Condensing boilers... 

​

...are they any good?

​

​

Another tricky one. I have to say, it all depends on which condensing boiler...

​

Condensing boilers have come of age at last. The good ones are very very good in my opinion. Just fitted one in my own house and I'm really pleased with it!

​

Condensing boilers are a new(ish) type of boiler that extracts more of the heat energy from the gas flame by allowing condensation to occur inside the heat exchanger. This requires a special heat exchanger resistant to the corrosive affects of the condensation, hence the extra cost of a condensing boiler. The best ones have stainless steel heat exchangers instead of the cast iron of an old style boiler.

​

Condensing boilers can use as much as 91% of the available heat energy in natural gas, compared to 50% to 80% for conventional types of boiler. Have a look through the SEDBUK boiler efficiency database at www.sedbuk.com

​

If you are considering a condensing boiler they will reduce your gas bill but they also have a few drawbacks...

​

1) Pluming. The exhaust gas from a condensing boiler is rather unpleasant. It smells more than ordinary boiler flue products and it contains condensation which make it look like wispy white smoke. This means that the location of the flue outlet needs careful consideration to avoid it being a nuisance. There have been rare cases where outside walls of houses have been damaged by dampness caused by condensing boiler flue gasses.

​

2) Location. Substantial amounts of condensation collect inside the heat exchanger and this is disposed of via a pipe to drain. Consequently condensing boilers need to be fitted where there is access to a drain connection.

​

3) New technology. Any new technology tends to be less reliable than conventional tried-and-tested equipment. I doubt if condensing boilers will prove to be any different. Finding a heating engineer to repair one may also prove more difficult as they are not widely understood by all heating engineers yet.

​

​

​

​

​

N.B. Please note this is a very old page I wrote in about 2003 but I’ve left it up as people seem to like it…

​

Gas Safe Register Logo 2

Copyright Michael Bryant 2019

Site first published 16th January 2004

Last updated 12th July 2019

​

Gas Safe Register 197499, CIPHE registration number 56207

Chartered Institute of Plumbing and Heating Engineering logo 2
OK

This website makes use of cookies. Please see my privacy policy for details.