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combi boiler--dhw return

Postby james woodland » Sun Sep 07, 2008 2:12 pm

I have a 35meter pumped D.H.W run, I installed a return but there is no connection to the floor standing combi boiler, can I drop it into the c/f (mains)

many thanks james
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Simply Build It

Postby htg engineer » Tue Sep 09, 2008 5:44 pm

Combi boiler with pumped hot water ?

Water should not be pumped directly from the mains, you can only pump water from a storage tank.

'I installed a return but there is no connection to the floor standing combi boiler'

So where does the return go to now ?
Why do you think you need/want a return ? the pump will only come on when the tap is opened, so should only pump the water used.

The only reason to fit a pump with a return is if you have a continuous loop, where each feed to a tap is tee'd into the main distribution pipe, used in hospitals where there's long runs and you need instant hot water, not long lags of cold water.

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