Having previously had a Vaillant boiler in my house for 20+ years, it was the only brand I was going to consider. I obtained quotes from four different companies, two from checkatrade, one from the yellow pages and found Heatable on a google search. I'm not sure how boiler installations are costed as all of the quotes seemed to be vastly spread apart for what seemed to be the exact same service. Heatable was the cheapest, and having read previous reviews and done my research, I decided to go with them. It was a bit different doing everything online as it was something I've not done before and was a little concerned about, but I can see how it saves time and it wasnt hard to do at all. Perhaps thats how the prices are able to be kept a lot lower. The installation was carried out on the day I picked, and to a very high standard even for a man of my expectations.