"Ian & Hilda Dedic" wrote in message
...
Hi guys,
I have a gravity fed hot water system from a normal hot tank ch in the
upstairs bedroom (a long way away from the kitchen tap)
and the hot water takes ages to run, what's more is there is not enough
pressure to let the new spray tap work properly. Cold water is not a
problem.

can I fit a small pump to increase the hot water pressure?

If so where should I put it? I have two sinks one in the utility room (ie
the old kitchen) and one in my lovely new kitchen in the extension.

The hot water stop valve turns all hot water to taps off, so if I put it
near there it would increase the pressure all round.

Are there any items I should be wary of with the increase in pressure
ie hot feed to washing machine, hot tank bulging? CH hot water system
becoming upset?

The pump would be between the tank and the taps, most likely near the valve
you mention. It won't cause problems behind it and will only come on when
water is called for. It will be fiddly to fit and a potential surce of leaks
and breakdown and will be noisy. OTOH you'll get pressure!

A good make and something which would (probably) be quieter than the usual
shower pumps might be:

http://www.inspiredheating.co.uk/aca...E_BOOSTER.html

The fact that the "new spray" tap doesn't work indicates to me it is a
pressure problem in taps designed for high pressure operation, rather than a
flow problem. Were it just a flow problem and were all the piping done in
15mm, you might improve things by going to 22mm - if you do that, remember
that the volume goes with the square of the radius (or diameter) of the pipe
but the flow rate goes with some power less than this. This means you get
more flow but it takes longer to run hot.

HTH


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)



what pump could I actually use?

thoughts and advice please,


(or could I get a spray tap which works better with low pressure hot
water?)

thanks in advance
dedics