Our hot water is set to 50°C. We have a heat pump and run it on Economy 7 so it's timed for the water to be up to temperature by the time Economy 7 switches off. Our 180 litre tank keeps the 3 of us going all day including 23-year-old son's epic showers. I have no wish to heat water up only to have it cool down when we aren't using it.
I always understood that Legionella a) was killed off by the chlorine in domestic water treatment, and b) thrived on static water open to the atmosphere. As our system is closed I imagined that the risk of Legionella was small. Our luck has held out for 5 years ...
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