During normal running, the Rayburn is used for DHW only. When
it gets chilly in the evening, the CH is used. If the rads. are cold,
this results in a rush of room-temperature water suddenly passing
through the boiler, cooling it from (say) 70C to 19C. Is this likely
to harm the water jacket in the Rayburn, which seems to be
made of welded steel? Can this rapid cooling be prevented by
a simpler means than a) turning all the rads. off, then turning
on the CH pump, then turning the rads. on individually with a
reasonable time in between turning each on?
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