My Worcester 28i specifies 600mm of copper before plastic begins.
And note, IIRC fro when I did my boiler, the measurement is from the
connections of the pipe to the heat exchanger inside the boiler, not
from the external connections at the
Fair enough. The 1 metre distance is from the manufacturers of plastic
fittings and I suspect they probably err on the side of caution to
cover themselves.
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