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Which is flow and which is return?

Thorn Olympic 38/50b boiler. Which is flow and which is return?
M, October 2010
turn the boiler on from cold, allow a couple on minutes on heating then feel the 22mm pipes the warm one is the FLOW the coldish one is the RETURN

wirecutterman, October 2010
link Click here to see other fixes for Thorn Olympic 38/50b.