Yet Another Microbore Question

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The new microbore system I am putting in, fed from a Glow Worm 30 CXi combi, will supply the rads via 10mm speedfit pipes connected to manifolds.

As both upstairs and downstairs has traditional floorboards, I want to run the tails to the rad valves from the floorboard directly below each valve (as opposed to having the pipes coming out of the wall/skirting).

If I do this with the 10mm plastic pipe, it will look a bit rubbish having a length of thin plastic pipe coming up through the floor and going up to the valve.

Can I have angled 15mm valves, and run a short length of 15mm copper pipe from the valve downwards, to go through a hole in the floor, and join the 10mm plastic pipe under the floor? This will be neater, and make the rads look like normal rads on a 15mm circuit. :confused:

Will this work without affecting the performance of the rads?
 
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Microbore in itself is a problem waiting to happen, so mixing and matching sizes is not going to make it worse.
 
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Thanks for the quick reply. I know the pros and cons of microbore. I recently bought a small wreck of a 3 bed end terrace. I am now very short of cash and have no heating system. I will only be living here for 5 years max.

So, you are saying that having a few inches of 15mm copper pipe linking the rad valve to the 10mm plastic pipe under the floor will not cause any real problems?

Thanks for your help.

Ian
 
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won't cause any problems. Do this quite often when fitting nice rads on microbore, for a better finish. Done one last week in fact.
 
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Thanks Micky and Ben. You've set my mind at rest.

Alternatively, can you get 4 branch manifolds with 15mm outlets?
 
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You don't need manifolds for 15 mm, you branch off from the main flow and return pipes as and when needed.
 
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