Hi, The house has this hot water tank, it's about 15 years old. It's always given us problems, the last one being a tidy sum of money spent on replacing a failed PCB about 2 years ago. I had an engineer over for a boiler service today, he had a look at the heating system in general and saw that the hot water tank was badly rusted at the back and leaking, and that it looked like it had been that way for quite some time. There was water damage on the cieling below as well, unfortunately hidden because it was the cieling inside a cupboard. He said he can't touch it because it's too badly corroded and might just fall apart if he did. He recommended that I replace it with an "unvented Megaflow hot water tank". He will provide me with a quote tomorrow. 1. Does this all sound about right? This is the first time I have had this particular engineer over. 2. Does this need a gas engineer or plumber? 3. This might be ignorant of me but I've heard unvented tanks are dangerous? Could I replace this with a vented one at all? Thanks in advance!