TheScullster wrote:

3. Is there a recommended (or mandatory) distance from the boiler that
pipework must be run in copper? I am considering increasing the mains size
to 22mm for upstairs rads and might take the plastic option.

The usual recommendation is to use copper for at least the first meter
of pipe to/from the boiler. You can go to plastic after that.


--
Cheers,

John.

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