"pauliepie" wrote in message
news

Thanks

I just always thought that yes with the cold water storage tank, the
higher the tank is above the highest tap/shower the better the cold
water pressure is coming out the taps/shower, but I cant get my head
round the pressure from a vented hot water cylinder.
So is it right a cylinder can be fitted either on the ground floor,
first floor or a loft in a 3 bedroom semi detatched house just as long
as the mcw tank is above the highest tap in the house!
If the cylinder was on the ground floor with the tank in the loft would
the hot water outlet be better on a first floor bathroom?
look forward to any replies
thanks

As far as the cyclinder alone is concerned it matters not where it is. The
static pressure at a tap is only determined by the vertical distance between
the surface of the water in the header tank in the loft and the tap.

Is one looks at flow and pipes as wel, it's slightly different. If the hot
tank is downstairs, there is a pipe running down to the hot tank and then
back up to the bathroom. The pressure available in the bathroom (with no
flow) is the same wherever the tank is but, if the tank is downstairs, it
will have to drive water through a longer pipe run, which will introduce a
higher pressure drop from beginning to end, than would be the case if the
hot tank was upstairs. This will result in slightly poorer flow (depending
on pipe bore, length, bends etc).

The taps downstairs will be less affected by the position of the hot tank as
their static pressure will be higher and the difference in pipe runs should
be less.

On balance, therefore, the hot tank is better upstairs, but only because of
minimizing the pipe runs to the lower pressure taps.


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