Grunff wrote:

Rob wrote:

Me too! Can't find anyone to commission the thing, but it all seems to
work and no leaks.

When I installed ours (a Grant), Grant sent out an engineer to
commission it as part of the deal.

--
Grunff

I think in theory Worcester will do the same thing, but not as part of
the deal. That's my next option I think. Or buy a flue gas analyser :-)