On Sun, 28 Sep 2008 20:32:32 +0100, David Hansen wrote:
On Sun, 28 Sep 2008 19:46:40 +0100 someone who may be "Samantha
Booth" wrote this:-

I am getting a tap kit from B&Q will there be any problem with the fittings
they supply with it going onto the hot pipe rather than the normal cold
pipe. Its the "screw into the exsisting pipe" kind of fitting.

Fitting it into what sounds like a mains pressure hot water pipe
will be no different to fitting it to a mains pressure cold water
pipe. However, I would avoid the '"screw into the exsisting pipe"
kind of fitting' and instead fit a proper fitting, a compression or
soldered one for copper pipes.

A '"screw into the exsisting pipe" kind of fitting' may release
pieces of pipe wall into the pipe, which will then trundle along the
pipe until they find something to interfere with. If they don't do
that they are likely to make a small cut into the pipe, which will
restrict the flow rate to the new tap.

I'd be concerned about thermal expansion too. When heated, holes get
bigger. So if you tapped into the pipe when it was cold, then ran h/w
through it you might find it started leaking - maybe not much but it's
something to bear in mind. The cyclic heating/cooling may also affect
the tightness of the connection, so it might work loose.