Heating offer comparison - Please share your experiences

Please note that an additional 5-7k for small parts/control components will be added to the price. This is probably only the price for the device.

We have firmly decided on an air-to-water heat pump.

OK, then that’s how it is. The main thing is that you have considered everything. Nevertheless, I stick to my advice to definitely listen to the chosen device live under load. When are you building? I plan my construction from 03/2020. The new Weishaupt Biblock is supposed to be very good. Google it. Unfortunately, it is probably rather one of your devices, but quite solid and really quiet.

because in my opinion the gas and ST system is not as good as heat pump with photovoltaics

Unfortunately, that’s true. Solar thermal is not very useful either, heat pump plus photovoltaics makes technical sense at least. But the combination sadly promises more than it delivers in practice. Keep in mind that you can also combine gas with photovoltaics.

Here is the calculation. So it’s no use for the heating? Is the heating load calculation then done by the heat pump provider?

The room-specific heating load calculation is generally done by the heating engineer (or commissioned) or the energy consultant who managed the thermal protection certificate. But often in practice, the heating engineer only estimates the heating load and builds “as we always do.” You should ask if the room-specific heating load calculation is included in your complete offers and is properly documented. The final result of the thermal protection certificate is of no use in terms of the room-specific heating load. These are two different values, sort of like answering “How much does your car consume?” with “100 hp.” OK, joke aside, the room-specific heating load is about the required power (in watts) to keep a room at the desired temperature even when the design case occurs, depending on the region, for example, -10 °C outside temperature. This happens only rarely, but it must be guaranteed. On the other hand, your energy certificate concerns the sum of the energy demand (in kWh) over the year, including sunny, mild to cold days. Logically, you cannot simply divide by days, because there must still be enough heating power on the coldest day. Power: Watt > Heating load calculation on the coldest day Energy: Joule or kWh (= power times time) > Energy certificate

So our Weishaupt air-to-water heat pump outdoor unit is only audible at subzero temperatures if you stand directly in front of it. On the terrace or in the garden you can't hear anything, and definitely not inside the house. So it's very subjective when talks about "nuisance" or the like. Make your own experiences; for us, the noise level was and is absolutely no issue...

Please adhere to the netiquette. Such comments are unacceptable. It is OK if you have a different opinion, but such below-the-belt remarks should be beneath your dignity.

It is always easy to present one's own opinion as an irrefutable fact, to throw around pub talk slogans, and then to recall netiquette during a correction.

If there are such significantly cheaper heat pump tariffs, that is great. Where exactly are these "enough corners"?

Most people know where they build their house and can inform themselves accordingly. The information served your comment "An air-to-water heat pump is never worthwhile because the cheapest gas price in Germany is cheaper than the most expensive electricity price in Germany." If you have chosen gas as the better energy source for yourself, that is OK. But your heat pump bashing helps no one.

to remember in the case of a correction.

That was not a correction, but just a different opinion. Secondly, a correction would of course be desirable, but phrases like "total ignorance" are completely unnecessary -- and in this case inaccurate. I have worked in very thoroughly and calculated everything. My example with the costs can be recalculated by anyone for themselves with their own rates and then decided for themselves. Anyone who really gets an extremely cheap heat pump electricity tariff will be able to recognize and take that into account. For everyone else, and that is probably the overwhelming majority, the situation unfortunately presents itself exactly like this: gas-electricity factor and annual performance factor essentially neutralize each other. Do you really not agree with that?

Make your own experiences, for us the volume was and still is absolutely no issue...

That's exactly what I recommended: listen for yourself and decide. But of course under load and not just randomly dropping by when there is really nothing to hear.