I am in the process of costing the replacement of my exsisting back boiler central heating with a condensing gas boiler and new radiators.
I am looking at a top range boiler :?: from Vailiant/Glow-worm,
Any best buys. ??. I have been advised by a retired corgi installer that repluming the rads with 10mm and the hot water with 15mm piping is an advantage to the performance of the the boiler. My house has concrete floors throughout, no hiding pipework. Is this repluming that much of an advantage?? :?: