ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Alessandro schrieb:

How have you set up your domestic hot water system?
Mine is set to 48°C (118°F) with an 8 K hysteresis. Hot water circulation runs twice daily to prevent Legionella.
I have disabled the Legionella protection because it would mean heating the water to 60°C (140°F) once a day.

Do you really like these tiny organisms so much, or why do you create ideal conditions for them by regularly circulating the water but at the same time avoid the high temperatures that would kill them?

Circulation provides comfort! Legionella protection definitely not at these low temperatures, rather quite the opposite!

Alessandro schrieb:

... because it would mean heating the hot water up to 60°C (140°F) once a day.

Without debating the usefulness of the ALF right now – is there no way to extend the interval to one or two weeks here? From my experience, the shortest interval in my heating systems is weekly, so the daily setting surprises me...

It depends on how the layering in your storage tank is and where the temperature sensor is located; that thickness should be sufficient.

The heat pump really has to work hard at 56 degrees Celsius (133°F), right?

At the moment, I have around 41 +/- 4 degrees Celsius (106 +/- 7°F).

RotorMotor schrieb:

Legionella protection is definitely not achieved at low temperatures; rather, quite the opposite!

I agree with Alessandro: If the circulation stops, you end up with a long pipe filled with stagnant water. And even more important than temperature is a high flow rate.

I have a point called "Legionella protection" in the hot water circulation system. I have no idea what it does...

Alessandro schrieb:

No idea what effect it has...

Checking the manual might solve the mystery…