This will be my first plumbing job so I hope someone can help.
I have just purchased a mono mixer tap for my kitchen and the instructions
state that the hot and cold water feeds must be of balanced high pressure.
The hot water comes from a Santon Premier Plus unvented water system and the
cold from the mains. So is the water supply ok for this tap?
I'm not familiar with your water heating system. does it produce hot water
at mains pressure, or is pressure defined by the height of a header tank?
The need for equal (ish) pressure is to make the setting of the hot cold
ratio reasonably linear over the mechnical range. If, in your case the
hot pressure is lower then most of the adjustment range will give
cold/cool water and the last little bit of the range will be hot
possibly with low flow.
Options are to return it unused, or experiment with the mixer attached
to the old taps by lengths of hosepipe or similar and see how it
performs and if needed remove it, dry thoroughly,clean,polish and put
back in the box and exchange it.
To Reply directly to my mailbox, change myisp to ntlworld
I get the impression from my searching that if the feeds are not of equal
pressure, then the higher pressure feed (probably cold) will force its way
up the hot pipe when the tap is turned on. Surely there are valves to stop
that happening. Can anyone confirm if my Santon unvented hot water system
delivers at mains pressure? I have emailed santon but they may be out of the
office until the new year and I want to get cracking.
I installed a Bristan tap on my kitchen sink which has a central spout and
levers for the hot and cold at the base.
What is interesting about this tap is that it does not actually mix the hot and
the cold at all. Rather the spout must have concentric tubes. I have the hot on
the outside and the cold on the inside. The hot and cold only mix after they
have come out of the tap.
Santon PremierPlus cylinders are designed and normally installed to provide HW
supply at the taps at mains pressure, similar to the Megaflo range. But it is
possible (although unlikely) that your system could have an unvented
(pressurised) primary system and low pressure secondary HW supply to taps. This
means it is difficult for anyone here to definitely confirm without seeing your
You could do a couple of checks yourself. The easiest way is to turn off the
incoming mains water supply stopcock - if this cuts the supply to all taps, both
hot and cold, then everywhere is at mains pressure. Alternatively, find the
cold water inlet at the bottom of the cylinder - is this 15mm dia pipe? If so
it is 99% certain to be at mains pressure - maybe you could trace this pipe back
and establish whether it connects directly to the mains system. Finally, if you
are absolutely certain you have no cold water storage tanks anywhere then the HW
will be at mains pressure.
Hope this is helpful
If its unvented that normally means meains pressure.
It its a combi, the answer will be almost certainly a yes,
If there is a [ressure gauge on the boiler, the answer will also be yes.
If you have a hot water tank with a zillion pipes and knobs on, thats a
mains pressure one. It won'tme made of copper either.
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