Thanks. Was not aware of this. However, Im not sure it justifies his choice of installation. In meeting this regulation Ive still ended up with 4 radiators being fed from 15mm speedfit (so effectively it's going down to about 10mm at the joints). The consequence is that they often don't even see...
Just had a new ground floor extension built and the plumber has taken a feed from the main heating circuit from the boiler that runs under our easily accessible ground floor void, run 15 speed fit pipes back up into the roof of the extension, and then fed back down to each radiator. We have four...