Room sealed does not necessarily imply cupboard friendly.
Almost all modern designs are room sealed, I doubt if there are any other
types amongst condensing models this means that combustion air is drawn
from outside and is sealed from the internal room air.
Boilers of many types including non room-sealed can be installed in
1) the manufacturers minimum spacings to combustible materials are maintained.
2) Enough ventilation is provided for combustion air supply (non-room-sealed
models) and appliance cooling.
Modern boilers tend not to need ventilation for appliance cooling.
When I fitted the Keston C25 in my own house I had an disused vented 250mm
diameter duct adjacent to the cupboard into which I could run the flue,
air duct, gas supply, blown off pipe, condensate drain and still provide
ventilation via low and high level grilles to the cupboard for appliance
cooling. You may wish to choose a boiler which is more cupboard friendly.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Condensers are madatory after April. Go for one with one a piece heat
exchanger & downward firing burner. Glow Worm do a good condesner as do
Worcetser Bosch and they will not break the bank. The RRs are Eco-Hometec
(made by MAN) and Veissmann, both German.
I'd guess it's less work for a plumber to always fit identical boilers.
Many still recommend Potterton from the time they were a decent make -
many years ago.
What a plumber recommends won't necessarily be the best for your
individual requirements. He is likely to be influenced mainly by profit -
ie ease of installation, good discounts etc.
IMM is a plumber in all but name.
*The more people I meet, the more I like my dog.
Dave Plowman firstname.lastname@example.org London SW
The SAP is a rating that new homes have to conform to. It is based on the
energy consumption of a building. A condensing boiler uses less energy.
They can put in a non-condesning boiler, but then will have to install more
insulation, etc to reach the SAP. A few hundred quid on a condenser raises
the SAP and they are a good selling point too.
Individual plumbers don't like them because they have to fit an extra 3/4"
plastic drain pipe and in general they are totally ignorant of them. The
first initial batches of condensers made by UK manufacturers in the mid
1980s were abysmal and never lasted, unlike the Continental makers. So
these dumbos still believe condensers only last 3 years or so.
The SAP allowance for condensing boilers was a bad idea. Allowing builders
to skimp on insulation by fitting a more efficient boiler that would
probably have got fitted within 5 years anyway is not helping.
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