Adding to a microbore system??

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Hi, recently moved house, 2 bedrooms upstairs don't have a rad fitted, I located where the manifold is upstairs , it's a 22mm pipe with end cap and 4 microbore feeding out, as there's 3 rads in use I followed the 4th to where it's capped off and plan to freeze the pipes and use it to feed a rad in the back bedroom, what I was wondering is at the same time could I tee off this 8mm to feed a tiny rad I want in the box room?

Heard a plumber say can't tee off 8mm but have also seen someone say they've done it and system is fine. What pipe would you recommend also, was maybe thinking couple the 8mm up to 15mm to back bedroom rad (about 15ft away from where the 8mm is capped)then down to 10mm plastic pipe up into the valves ???

Help much appreciated guys :)
 
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Nope wont work you will need to tee into the 22mm pipes and run new feeds from there
 
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Nope wont work you will need to tee into the 22mm pipes and run new feeds from there
Cheers, so can't even run one to bedroom off the capped pipes and do away with the box room one??
 
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It all depends on the size of the radiator and the total length of the 8mm pipes , it may be OK but dont Tee off the 8mm to another rad
 
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Cheers they're currently capped off about 4ft from the manifold, (ideally I'd like to carefully bend them back over if poss and extend) as the rad needs to be the other side of manifold maybe 8-10ft other side of it, room is about 12x11ft so wouldn't think a huge rad needed? Would I need 8mm bore to extend with or 10mm plastic tubing OK?
 
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