Expanding underfloor area

25 Jan 2011
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United Kingdom
Hi all. I installed a John Guest single room underfloor kit years ago which heats an extension of about 25 m2. I'm very happy with it and it works beautifully! We are now planning a loft extension of around 16 m2 and underfloor seems to be the most logical way to go to heat this.

My question is, could I simply fit a two port manifold to the existing pump/blender unit to add an additional zone, or do I need to start again with a new unit? I'm assuming the pumps are all the same capacity?

Many thanks. Barry
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