central heating pipework


Postby geoff1057 » Mon Feb 09, 2009 12:37 pm

am i right in saying, on a double pipe heating system, the main feed and return pipes are 22mm, and teeing off to radiators, feed and return pipes are 15mm. ..........and if i added another rad i tee into the 22mm feed and 22mm return.....with 15mm speedfit , would that be ok ??? Thanks
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Postby nitro23456 » Mon Feb 09, 2009 6:49 pm

My feed and return are 15mm under the floor boards but 22mm from boiler and primaries and thus are reduced somewhere after the motorised valve.

Lift a floorboard and take a look.
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