8mm Supply to Radiators for 2 new Radiators


Postby Zacccc » Thu Nov 06, 2014 2:02 pm

I am putting two new rads in my house. The other rads are fed by 8mm microbore so I want to feed the new ones with the same so as to have an even supply throughout the system. My plan for each rad is to put a 22 to 15 reducing tee on both the CH flow and the CH return and then on each 15mm line from the tees put a 15 x 8 reducing coupler to the 8mm microbore. I'm only a DIYer so I just wanted to check with the pro's that this sounds ok.

So this will involve two tees off the flow and two off the return. Is there a more efficient way to do it. I have seen 2-port 8mm manifolds but I think they involve soldering, which I've never done, so that option's out I think.

I want to put 8mm TRVs on the rads but the only one I've seen has been the Danfoss RAS-C2 in the Screwfix catalogue, where it gives the diameter as 8-10. Does this mean that it will fit both sizes?

Thanks.
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Postby proptech » Thu Nov 06, 2014 7:21 pm

Hi Zacccc

Why not tee the 22 once, reduce to 15, and tee off to the rads in 10mm.
The system will need balancing after, and don't forget the inhibitor.
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Postby Zacccc » Thu Nov 06, 2014 11:10 pm

Yes, thanks, that does sound better.
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