On 14/11/2020 22:04, Tim+ wrote:
newshound wrote:
On 14/11/2020 20:14, Tim+ wrote:
michael adams wrote:


It appears its not the actual contact but the heat being radiated (?) by
pipes potentially being up to 120C over prolonged periods which may cause
the problem

So youre taking the calibrated scale of a thermometer as an indication of
typical CH water temperatures?

Tim

Boiling point of water at 3 bar is about 134 deg C. IIRC boiler gauges
typically go to 3 bar, presumably relief valves are slightly less.


So youre taking the relief pressure valve setting in boilers as an
indication of typical CH water temperature?

Tim

Of course not. I am pointing out that, potentially, that's the
temperature the water could reach if there was a double failure in the
boiler control system.

I'm also making the point that it is not *so* unreasonable to have a
pipework thermometer capable of going up to 120 deg C.