I have just moved my hot water cylinder to a cupboard around 3m away from the bathroom the cylinder is all re-plumbed in 22mm as the old one was I'm now running new pipes from the cylinder under a concrete floor in a straight run of around 3m to the bath so I will only have 2 elbows in the pipe work before the bath connection.
Can I run this in 15mm or must it be done in 22mm. .
Can I run this in 15mm or must it be done in 22mm. .
