Doctor Drivel wrote:
"Tim Downie" wrote in message
I know I could use an indirect thermal store or other system but the
thread was about DIYing unvented cylinders, not a platform for you to
parrot on about thermal stores & heat banks.

Heat banks a near zero-risk and superior all around. Only fools fit
unvented cylidners. I see which one you are.

*yawn*

Still can't answer the question about annual certification I see.

TIm