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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