On 14/11/2020 20:28, 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.

The PRV is normally just that, not an Over Temp & Pressure Release
Valve. However the bailer's main internal stat will typically kick in
well before boiling point.

(and remember the flue on most modern boilers has a plastic inner!)

--
Cheers,

John.

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