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I
have
installed a pressurised hot water tank in a couple of properties now, in
fact I
have just completed one this week - it has the following advantages
over a
'standard' system.
Hot water is delivered at same pressure as cold -
useful for good flow, particularly any with big shower
heads
This means that in a shower that has both hot and cold
feeds the balance is better and the effect of someone else turning a tap on
has
less effect on temp variation. Modern shower mixers are so much better
anyway
nowadays.
No header tank needed in loft - less to maintain,
worry
about, keep birds out of, stop freezing and if you needed to have the
tank
in a cupboard in a bedroom no noise when it refills.
Immersion still available
Disadvantage - as ever cost and that when you do
pressure
the old taps you need to check you have no leaks. Need a pressure escape
pipe to
the outside.
A combi boiler of course is very different in that it
does
not store hot water - it delivers heat on demand and the size (BTU)
dictates
how much volume at a given heat it can deliver - I have however
always had unsatisfactory experiences with combis mainly I think
because
the ones I have used have been installed under capacity meaning I got a
poor
flow (trickle) of hot water or could only get warm water. It used to take
me an
age to fill a bath with hot water. I also had a shower that was plumbed
to both cold and combi hot and when the cold went up in pressure it
caused
the boiler flow to reduce and it went stone cold. Mine was OK in summer but
in
winter when the incoming water was much colder it couldn't cope. I
think
nowadays the combi's are much more efficient (condensing perhaps ?)
and are
probably a satisfactory experience. maybe someone could comment who
has
one. They must I guess cost less to run as they only heat on demand whereas
storage cylinders are heated daily and not as
required.
2p.......Kevin
I’ve just been sent a 4 page
fax
by my architect with questions on there. One of them is do I want a
combi-boiler for CH and HW or a cylinder system operating at greater than
atmospheric pressure.
Answers on a postcard
please….
Tim.
For
more information: http://www.automatedhome.co.uk
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