Experiences with heat pumps and photovoltaics?

The difference is as follows:

An air-to-air heat pump extracts heat from the air (outside air or exhaust air) and transfers it to the interior spaces via ventilation. Underfloor heating or radiators are not needed.


An air-to-water heat pump transfers the heat from the air to a heating circuit with underfloor heating or radiators.

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Ah, all clear. Thanks for the explanation! As I said, I was actually talking about an air-to-air heat pump, but if I understand correctly, I need the other version if I want underfloor heating? Underfloor heating is always very comfortable.

But I can also advise you again, if you want to inquire further, then have a look in a showroom like Vaillant, there you can see all the devices and also hear how loud they are, or you can visit a trade fair, you will surely find something there and be able to inquire, you just have to see if there will be one near you soon.

The showroom idea is a good one, as a layperson it’s very hard to imagine what it actually looks like. We planned the trade fair anyway, not just for heat pumps – it’s useful for other things too, as a beginner you have many questions on various topics. Thanks!

I always insist on the maintenance contract as well, you are very well protected there, have it explained to you in good time what advantages are included, but I think it's good you get an appointment super quickly if something breaks down, discounts when something needs to be repaired, and such things can happen. That would be my last good tip! In any case, I wish everyone a good start into the new year today!

Has anyone ever thought about a combined solution? Like an exhaust air-water heat pump such as the NIBE730?

Air/water heat pump with crossflow heat exchanger
Here, the exhaust air, after having transferred most of its energy to the supply air via a cross-counterflow heat exchanger, is discharged and disposed of outside. Depending on the heating demand, it still flows over the surface of the air/water heat pump evaporator. There it transfers the remaining residual heat to the refrigeration circuit of the heat pump. If additional energy is still needed for heating or domestic hot water preparation, it is obtained from the outdoor air supplied additionally to the heat pump.

Hi,

an exhaust air heat pump may still be useful in a passive house. Otherwise, it is a money pit, since in a normal house it is almost like a direct electric heater for physical reasons.

Considering that the exhaust air after the heat exchanger contains almost no residual heat, it should be clear that the heat pump can only pump heat from the level of the outside temperature. However, it then has no advantages compared to a normal air heat pump. Also, I am deterred by the fact that this heat pump does not appear in the annual performance factor calculator. The values in the data sheet are also not exactly convincing.

Regarding the maintenance contract:
If an air heat pump is properly installed, there really isn’t much to maintain on it. You can therefore basically consider the contract as additional insurance. You have warranty anyway in the first few years. If the heat pump survives this period, the likelihood is high that it will last for the next years as well. Prerequisite: correct operation.

Regards Nika