In an earlier contribution to this discussion,
Dave Plowman (News) wrote:

In article ,
RichardS noaccess@invalid wrote:
this is the first time it has been known to happen, though (heating
the storage tank). They say that the immersion was left switched on
for a day, I have suspicions that it was far, far longer than that,
though...

If the stat had stuck on, and it was left on without being used, the
steam from the boiling water will heat the header tank over time.

I guess this must be the case - since it has apparently prompted a change in
the regs - but I don't quite understand it.

I would expect the steam to come out through the vent pipe and to fill the
attic with steam rather than heating the header tank (unless the vent pipe
dips into the water). Surely, to heat the water in the header, the steam
would have to come up the cold fill pipe from the bottom of the cylinder -
which seems unlikely. Am I overlooking something?
--
Cheers,
Set Square
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