One, try getting a plumber around here! Two, it might be Piss easy but getting a plumber, see one, and try getting one that likes to go out of his comfort zone from a fag packet sketch, I understand reading on the pages of FB heat geeks etc the bad news will always be more prevalent than the good news stories, but it seems depending where you are in the country and the amount of people installing systems that do not do what they're supposed to do is significant, or maybe these people are expecting too much from these systems, OR have been promised something they haven't been given.
I've dropped a guy an e mail who is accredited by the Heat Geek scheme, but he's 1 1/2 hrs away from us 😟 so we'll see if interested.