Jamie really knows what he's on about, we just wanted to replace our old boiler like for like leaving the type of system we had with a hot water tank and just replacing the boiler. He listens to what your needs are and suggests the relavant boiler that would suit, in our case this was a baxi/potterton titanium heat boiler. He has fitted it along with the nest thermostat. All done very professionally and has explained everything we need to know about them. Any problems just give him a call he said, would definitely recommend him to anyone that asks.