In an earlier contribution to this discussion,
Matt Beard wrote:

Thanks SS

The OP didn't understand what his plumber meant when he suggested it
was a leak in the coil, so I assumed that he did not have a working
knowledge of heating systems and so rather than using the "correct"
jargon I used names that would be easy for a layman to understand. I
thought that it was best to show the similarities in the basic
circuits and to avoid unnecessary details about whole system to allow
the problem to be understood, rather than use correct names and end
up with confusion about "why does the cold water storage tank connect
to the hot water cylinder?" and such issues!

Indeed - and it was a perfectly good explanation without the need for anyone
to pick holes in it to demonstrate how clever they are!
--
Cheers,
Set Square
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