Well we have arrived to discover that DP's parents have had this fitted in the last year since we visited, i don't know much about it but they seem very happy with the results, My concern is that they will be paying a lot of money on heating and it will be going straight up through the roof.
Does anybody have this or has looked into this? Any past experiences of it?
I'll do some more research later but i'm trying to not use too much of MIL's limited internet allowance.