13-03-2022, 07:07 PM
(13-03-2022, 07:01 PM)Sinewave Wrote: I think that so long as the water doesn't stand for too long, bacteria can't be built up, for example if you have a 100 litre cylinder and you use 100 litres and some over the course of days or a week, you'd be ok to reduce your temperature.
Nope - Legionella breeds in the pipework in low-temperature systems. Dangerous.
Heat pumps specifically have a sterilisation cycle one a week where the DHW temperature is raised to 70C (I think) for 2 hours just to kill anything lurking.
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