We are looking at replacing 21 year old boiler and changing over to a pressurised water system. We have used a local guy for boiler servicing and he helped us over the cold spell when the boiler packed up. He never seems to have work on (he always is able to come over at short notice….even when other plumbers were mad busy), and he comes across as nervous. When I’ve asked him technical stuff, he sounds like he knows basically what he’s doing, but perhaps not giving a total feeling of confidence.
He comes across as trustable, and his soldering looks tidy, but he’s not a registered fitter for Viessmann (so we don’t get a full 5 year warranty)…would you trust him to redo the heating?
I guess what I’m after is a feeling for how good his technical knowledge needs to be to do a good job (are there loads to tricks to fitting which make a difference, or do you bolt the stuff down, plum it in and switch it on?). He did mention putting in cleaner(?) for a week before the installation and fitting a mag. filter to improve the like of the boiler, which I guess are good signs?