Hello,

Thanks for your advice guys.

The diagram got a bit squashed when posting so wont make any sense!

The rads from bathroom, bed 1, bed 2 are connected to one pipe which in
turn connects to the return from the cylinder to the boiler, bed 3
connects to the cylinder return seperately approx 4 inches from the
other rad connections and isn't affected. The downstairs rads return
also comes upstairs and joins the cylinder return and that isn't
affected other than normal convection.

I don't think I'm going to fix this as I've already changed the pipe
layout once and it's getting costly so I may go with the non return
valve on the return to the rads

Thanks,

Jamie

Dave wrote:
jamiep wrote:
... snipped

Many thanks for any help that you can give.

Jamie

I couldn't understand the pic/description but, if you can't common the
returns in an organised way put non-return valves in the heating circuit
to prevent the reverse flow.

Dave