My Response 120 boiler packed up a few months ago and several parts were changed out by the ideal / homeserve engineer at no cost. However we have been experiencing what I now known to be called 'explosive start' and the boiler failing to start at all. The engineer came out yesterday and apparently we are now on the list to be authorized for a replacement boiler. My question is has anyway had the experience before and what range of boilers would they generally offer to replace with. I should know whether I will have to pay for the replacement or not by early next week.