@Tvs unless your thinking of drinking the water in your radiators you won’t get legionella ?? there will be a temp for radiators and one for hot water. There is a very slim chance of getting legionella from a combo boiler as there is no standing water as there would be in a tank. Your mains water is moving most of the time due to day to day living, dish washers, washing machines, cups of tea etc
The only person who got all his work done by Friday was Robinson Crusoe.
Anything i post over three lines long please assume it is an article lol.