Do not use this company. They're expensive, the customer service is substandard and defensive and it was a genuine struggle to get my problem fixed. I was without reliable hot water for 6 weeks and I had to spend a lot of my time arguing. The reports sent back from the engineers to the company were inaccurate and the work was careless. The reply to this comment will be from the guy I had to argue with. I actively discourage use of this company as there's really not much I can say in their favour.