Cannot fault the onsite work, the installation of our boiler went very well and generally the office people I rang at VHS for help and advice were very accommodating. They were keen to help and listened to the problems and tried to find solutions. However, When payment was due I found that the invoice was incorrect as it did not reflect the deposit I had paid. I was told a new one would be emailed to me, it never arrived. I did the calculations myself and paid what was owed. With the boiler warranty, I was told it would be for 10 years (certain conditions applying) and when I applied to Vaillant ( boiler manufacturer) for it, I was told it was only 5 years. When I rang VHS I was told that they would speak to Vaillant and would eventually receive the warranty. I am still waiting, this was over two months ago. After the boiler was installed, the water pressure for the shower was very poor. Upon contacting VHS, I was put through to an 'engineer' who stated this was a common problem and that it was the fault of the system in the house and we would need to buy a special combi shower mixer. If I wanted someone from VHS to come out to check the system, I would be charged and would have to wait at least a week. It turned out to be a simple blockage in the water pipes, which my next door neighbour resolved for me. Pressure is now better than before the new boiler. Then certain parts of the system began to leak because of the increased pressure, one radiator valve and the shower mixer unit. Luckily the property is about to undergo a renovation, otherwise I would be looking at having some major work done in the bathroom. All I can say here is that this must be quite common for older systems and VHS should, in my opinion, make householders aware that this may happen. I am still waiting for my boiler warranty!