Have heard there are problems with them, and the lifetime expectancy is
low compared to non-condensing.
Is there any truth to this?
Am undecided as to what boiler to get. have decided on Vaillant,
either EcoMax (condensing), or TurboMax (non-condensing). The price
difference is about £250, but the efficiency is better (91.1% comapred
Any guidance appreciated.
(PS. going for the 28Kw boilers).
On Sat, 08 Nov 2003 21:55:02 +0000, Zapp Brannigan
No. It's an old wives tale perpetrated by the plumbers talking to
each other in the merchant's. You can easily identify them because
they all have the same name - Mate. How they tell each other apart,
I am not sure....
Anyway, the reality is that the first generation of UK manufactured
condensing boilers were of questionnable reliability basically because
a lot were constructed by adding second heat exchangers after the
first main one and not designing the means to carry the condensate
away properly or in suitable material. The condensate is mildly
acidic and otherwise corroded the works.
Condensing boilers have been commonly used in Germany and Holland for
more than 20 years and products designed and manufactured in these
places are very good. Many of the latest UK made ones are as well.
Designs incorporating down firing or radial burners and heat
exchangers of stainless steel have made a big difference.
It's also worth pointing out that the minimum efficiency level
permitted by Building Regulations of currently 78% is likely to be
increased to 86% in 2005. This will not be achievable by
conventional boiler technology.
There is, in any case, less and less difference in design and
construction between condensing and conventional boilers.
You won't be disappointed with this product. Several people in this
NG have used them.....
To email, substitute .nospam with .gl
A condensing boiler is a high efficiency modern boiler that incorporates an
extra heat exchanger so that the hot exhaust gases lose much of their energy
to pre-heat the water in the boiler system. When working at peak efficiency,
the water vapour produced in the combustion process condenses back into
liquid form releasing the latent heat of vaporisation. A side effect is that
this water, known as condensate, which is usually acidic, has to be piped
away to a drain or soakaway.
If your existing boiler is more than 15 years old, replacing it with a
condensing boiler could save you as much as 32p in the pound on your fuel
Bl**dy H*ll - it's not as bad as that, is it?!
I remember a few years ago Which? tested WD40/Plus Gas type stuff
('dismantling lubricants'?). Must've been a Friday afternoon job because
they decided to try out The Real Thing too: they found it ranked about
midway amongst the various products for efficacy!
The most dangerous component in a car is the nut that holds the steering
Can't answer this as my Vaillant EcoMax has only been installed for a
But the difference in heat and hot water is incredible. Nice warm house, and
a bath that fills up with hot water to the wife's chest, not just to her
navel. Although these days, they're not too far apart anyway........... So
far I am well pleased, even when the pipe at the eaves is trailing white
smoke / gas / steam / whatever.
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