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