I've got a plumber in doing some jobs for me at the moment, including fitting some new radiators to an existing system, which has a combi boiler and 22/15mm copper pipes throughout. I left him to it this morning and came back to find he'd installed a rad using 10mm microbore; he'd put the 15mm TRV and lockshield valve which I'd supplied to one side, and bought his own 10mm kit instead.
I am admittedly predjudiced against microbore as it's harder (IMO, for me) to fit, and I believe more likely to block; so I was a bit hacked off with this, especially as there was no problem at all with access to existing 15mm pipework under the floor. He'd simply fitted lengths of microbore to the ends of the flow and return 15mm pipes using reducers.
When quizzed, he said it was because radiators "work better" with microbore; that's as much as I could get. The guy is very uncommunicative and I find difficult to talk to, but he's reliable, good value, and does a good job, and I don't want to make an issue of this unnecessarily. But before he fits any more rads for me can anybody tell me if it's possible there is any truth in what he's saying?
Thanks David