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Thanks for the advice - sounds sensible

Thanks for replying! Would that be 'safe' as far as legionnaires or damage to the unit? If it is, then what would be a good amount of time/temperature for the monthly heat-up?

We have an unvented cylinder with a Horstmann Electronic 7 timer. The cylinder only serves a wet room which is very rarely used. The rest of the house is served by a Vaillant combi boiler. The timer on the cylinder is set to heat up water 3 times per 24 hours, which I think it is the default...