Not allowed to say because of technical issues that stop them being supplied mainstream,(H&S etc) but its one a well known supplier had on test and very cheap.
If it works I'll let you know but any pics would have to be email.
I'm thinking about marketing, what words do you use to describe your system( assuming it's not thermo pure), and how do you describe the benefits?
Does -Thermo dynamic pure hot water system- tread on anybodies toes?