I had air source heating system fitted. I searched around and most company's where all about the same price. One of the reasons for using EPC was due to very good communication. The fitment was not a straightforward one . The hot water tank had to be fitted in a small outhouse and the water pipes running through my Kitchen. I decided to take my Kitchen apart to make running the pipes easier. All the pipework was done in copper and to a very good and tidy way. The workmen always cleaned up behind them at the end of every day. We where left without hot water for one day, but it wasn't a problem for me due to having an electric shower. The workmen had to stay late a few times. On the last day they didn't finish until well past 9 pm. I went and got them a McDonald.