Rob Foster
Esteemed
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- 2,083
I once tried 2x big rads doubles rated at 6kw total on a 15mm feed and rtn ....no chance it was in my gaff so didnt matter just banged some 22mm in and lovely Rob Foster aka centralheatkingThe reason they are not currently working is probably an airlock, even with all other rads closed this can still happen. The reason they originallt wasnt working as well as the rest of the house is likely undersized pipework. You can feed 2 rads off a 15mm supply but it depends where those 15mm pipes are tapped off the existing system. If they come off other 15mm feeds then they will suffer with poor flow.