Flow and return layout for addition of UFH to existing system

20 Sep 2011
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United Kingdom
Hello all.

Just in case one of you knowledgable people understands the intricacies of flow and return planning I'd like to ask for your advice.

I've just ripped out most of the old ground floors in my house and laid underfloor heating.

I've laid a new flow and return from the existing pressurised cylinder (in cupboard upstairs along with motorised valve, wiring centre etc) to the cupboard downstairs that now houses the new boiler (about 6m away horizontally). The new flow and return run through a cupboard adjacent to the boiler cupboard that holds the ufh manifold and ufh wiring centre.

The question is, for the ufh should I tee off the main boiler flow and return in the manifold cupboard and place the motorised valve in there too? Or should I place the motorised valve upstairs in the existing cylinder cupboard and run a dedicated (flow or return?) pipe between the existing cylinder upstairs and the manifold cupboard downstairs?

Does anyone have sufficient heating layout to advise? Thanks.
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