very poor service,when you enquire very promising about everything once done that is it. i was told i will get a call regarding servicing after one year ,have not heard since it installed now i phoned to enquire all i am getting is free service period is over now i need to pay for it. i was told the the tank will be removed from the loft but it was not done as it is big to come out of the hole,i informed this two days later it installed and i was told it is health and safety issue to the engineers,why dont you tell this to customers when first enquiring rather than telling them when you arrive at the scene???? i would not recommend VHS to anyone if you go with it make sure all these agreed.