Having a total nightmare with hassle free boilers and would highly recommend avoiding at all costs. Bought a Viessmann boiler 5 years ago which has caused us nothing but trouble. We paid for an extra 2 years warranty taking the warranty to 7 years but between Viessmann and hassle free boilers they're both saying we have to speak to the other company to get someone out for the latest problem (plate heat exchanger) we've been left with no hot water for 5 days now. Hassle free boilers DO NOT have a phone number to ring anyone instead you have to communicate using emails which takes days to get a single reply everytime. They couldn't help you more when you're buying from them but once you've paid they want nothing to do with you. We're now having to go to trading standards to resolve.