Hmh, basically, but this applies to all air-to-water heat pumps: a heat pump is only as good as the casing that surrounds it. Don’t fall for the sleight-of-hand tricks where utopian factors are given.
The stupid thing here is that, according to the brochure, information on COP etc. is only provided in connection with a solar system, and numbers, especially at minus 7, which are very interesting, aren’t provided at all (at least I haven’t found any). Solar with the air-to-water heat pump is not exactly, uh, economical. If you really have nothing better to do with your money, then yes….
I myself am not a fan of these split inverter machines. Large heat exchanger on a much too small area, then weather like now, fog at 0° and the unit immediately frosts up. Then it’s better to spend a few euros more and get a big machine.