Condensing vs non-condensing combi

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In a small property like mine (2 bed flat), what kind of differences in running costs would you see between a condensing and non-condensing combi boiler? Whilst I know condensing boilers are more efficient, is the extra expense worth it (does the extra efficiency worthwhile in a small property)?

PS. I am aware of the legalities (or non-legalities!) of installing non-condensing boilers, but I have a GSR friend who is happy to install a non-condensing combi if I so desire.

Thanks
 
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Pointless question, no decent RGI will say its a good idea to install a non steamer, unless you can do it legally via the points system
 
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Look at the efficiency of both, then work out price difference and life span of both, then are your rads bigger (which cost more to buy then produce production emissions) to keep condenser condensing, extra for drain pipe or maybe a condesate pump and running of pump disposal of broken pump, then work out particulates of aluminium giving us all Alzheimers and cost to NHS taxpayer, then do the maths, it's all bolllokks to brainwash us and nobody gives a shiitt, but well done for asking.
 
M

mysteryman

Buy a good quality condensing combi with weather compensation. The only wiring is the mains to the boiler and a low voltage pair to the outside temperature sensor. Any non-condensing boiler installation will be illegal - and you may have legal and warranty issues on an imported boiler.
 
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Buy a good quality condensing combi with weather compensation. The only wiring is the mains to the boiler and a low voltage pair to the outside temperature sensor. Any non-condensing boiler installation will be illegal - and you may have legal and warranty issues on an imported boiler.
It's like reading an advert from a condensing boiler manufacturer :eek: Or a weather compensation one ;)

There are domestic situations where it is legal to fit a non-condensing boiler, but not many. There is an assessment procedure that takes account of the potential difficulties fitting a condensing boiler. Not many people qualify!

Expect a condensing boiler to give you 10-15% better fuel efficiency on your central heating, perhaps not so great on hot water. The efficiency of a condensing boiler varies quite a bit depending on how it is used and you could even do better than this (or a little worse). A non-condensing boiler (assuming a new one) is pretty much stuck at just under 80% efficiency (band D). You can check the rated efficiencies of boilers on the SEDBUK database to get an idea.
 

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