Air-water heat pump current consumption and data

I think it's correct as Alessandro says: If the circulation is off, you have a long pipe of standing water. And even more important than high temperature is high flow rate.

That is unfortunately wrong! Flow rate is only good if the water also goes out. Running in circles brings danger instead of added value!

Is legionella protection once a week sensible at 70°C?

That is unfortunately wrong! Throughput is only good if the water also goes out. Circling around brings danger instead of added value!

Yes. Ok. But you shouldn't just leave it standing in the pipe either...

Yes. Ok. But you shouldn’t just leave it standing in the pipe either...

But just circulating it in a loop doesn’t kill any Legionella as long as it stays in the same closed system.

No, of course not. Although with sufficient speed, frictional heat of course also occurs... ;-)

Do you want to say now that no circulation at all is more hygienic than running it occasionally?
I would gladly leave it off completely for reasons of efficiency and the purpose of "I don't need it".