Heat pump Knv or IDM air heat pump

Hello! Since our energy certificate shows 7.4kW including hot water, I am wondering which is the best air heat pump. Idm or Knv would be available nearby, but which one is really recommended? Thank you

I have an IDM iPump A2-7. It is great.

You first need a proper heating load calculation, only then can you choose the appropriate heat generator. The energy certificate is not equivalent to a heating load calculation/heat demand calculation.

Hello!
Since our energy certificate shows 7.4kw including hot water

Could that perhaps be 7.4kWh/a?

Here is a screenshot.

The screenshot does not provide any information on whether a proper heating load calculation was done. Were you asked about the desired temperature? I would not accept a bivalence point of -5°C. That would be the calculated point at which the electric auxiliary heater supports. It heats directly with electricity with a COP of 1. Choose a heat pump that has enough capacity at NAT and can modulate its output as low as possible. It is very important to correctly size the underfloor heating! For this, you need to specify the desired temperature (as well as for the heating load calculation) and also the maximum supply temperature. The problem is often the bathroom, as the desired temperature is usually higher there and the area is too small. If necessary, additionally install a wall heating. Alternatively, an electric auxiliary heater decoupled from the heat pump heating circuit. No separation storage tank, no combination storage tank, no solar thermal, no stove with water jacket. The heat pump must heat directly into the underfloor heating to be efficient. KNV is (I believe) Nibe.