[IneffablePigeon]

The legionella thing is a little overblown fwiw. 50 degrees is perfectly adequate, and you can go lower with very little risk if you set it to briefly bump up to 60 every week or two. Even that is not hugely necessary in a domestic setting.

https://www.heatgeek.com/articles/legionella-and-water-tempe...

[moooo99]

This is a heavy depends. Primarily on how well insulated throughout your home your waterlines are and how frequently they are used.

If you only have 50C in your tank and badly insulated lines, your temperature can dip below 50V very easily where legionella feel really comfortable.