"IMM" wrote in message
...

"Andy" wrote in message
om...
Hi,

I'm currently preparing to have my current domestic heating/plumbing
system replaced and will be using a combi boiler. I have almost
everything sorted out, but I can't find any info on what to do with
the relief valve pipework.

It must be copper and terminated outside at low level, typically a few
inches from ground level. There must be an elbow on the end of the pipe
to
direct any discharge against the wall.

I think this is one of the pre-cooked strings the IMMbot currently has in
its repertoire dictionary. I've seen a few PRD outlets terminate at high
level with an elbow to point them back at the wall, but IMHO and according
to the instructions on the various boilers I've fitted the corerct practice
is to terminate a few inches above ground level but directed straight down.
(If it's pointed back at the wall there's more chance of it spraying out
everywhere when teh pressure relief valve blows off.)


The pipe does not have to be sleeved
running through a wall.

For all copper pipework it's good practice (and may be mandated in various
regs) to sleeve them where they pass through masonry walls to prevent
corrosion.