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8mm supply to radiators (Read 1560 times)
Zac
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8mm supply to radiators
Nov 6th, 2014, 2:09pm
 
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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thescruff
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Re: 8mm supply to radiators
Reply #1 - Nov 6th, 2014, 5:21pm
 
Hi Zac  Smiley and welcome to ATT.

Answered the question elsewhere but a couple of points.

You need to tell us what boiler it is and where you intend to tee off the 22mm. Get this wrong and you'll risk reverse circulation.

You only need to tee off the main pipes once then split the 15mm 2 ways

The valves in the link are 10mm and come with a 10 x 8mm reducer
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