ᐅ How complex are heat pumps in everyday use?

Just a quick note on efficiency – these are existing buildings with correspondingly high supply temperatures. I think that’s pretty good.

RotorMotor schrieb:

First of all, I would say that it is absolutely no problem to comfortably heat your house or apartment this way!

I find this statement and the excerpt from the Fraunhofer study very reassuring for all home builders who want to rely on this state-of-the-art technology.

Benutzer200 schrieb:

In the end, the question will also be what you understand by "economical"

I deliberately wrote it that way because to me "economical" means that the system delivers what the calculations promise. After all, these calculations are an important part of deciding on a heating system. It seems that poor settings can cost both efficiency and service life.

I find it interesting to what extent the calculated consumption values later actually correspond to the real consumption values without any intervention. To use the analogy brought up by @RotorMotor with cars: the impressive fuel consumption figures of a downsized engine are hardly worth much if driving behavior tends to be more spirited in practice.

Musketier schrieb:

I believe the same could have been said about gas or oil heating systems 30 years ago. But hardly anyone cared back then.

That’s true. The information and interest situation was different back then. I no longer drive Bavarian V8 station wagons, even though I am still very attracted by their sound, agility, and power. Times are changing.

hampshire schrieb:

1. How much knowledge and skill does a homeowner actually need to acquire in order to achieve the cost-efficiency they expect from their decision?

People choose a heat pump because they do not want to build a passive house. All other heating methods become less viable after reading the climate report or trying to get a gas supply contract. Once that is understood, you can study the topic—the principle is quite simple:
An external company performs a room-by-room heating load calculation for all rooms including the bathroom, aiming for around 22°C (72°F) with a maximum supply temperature of 30°C (86°F). The underfloor heating installer needs this anyway if they don’t want to guess.
The selected heat pump should not have been on the market for more than two or three years AND should not be oversized beyond the maximum heating load according to the above document. No additional capacity allowances.
Using the above document, you can avoid installing individual room controllers and refuse their installation.
You also refuse the installation of a buffer tank.
The heating technician performs the hydraulic balancing. Fine-tuning can then be done later if desired, with the help of online resources. It’s not rocket science.

hampshire schrieb:

2. How likely is misuse by inexperienced users who simply want to keep their house comfortably warm?

Following the above instructions = 0.

hampshire schrieb:

3. What habits must a person give up when moving into a house with a heat pump for the first time to achieve the expected cost-efficiency?

“Adjusting” various knobs. Without the individual room controllers mentioned, it becomes complicated enough that this simply doesn’t happen. Every room stays at the same temperature (±2°C / 4°F). That’s how it is and how it stays.

Deliverer schrieb:

You can be exempted from individual room controllers with the above document and refuse their installation.
You can refuse to install a heating buffer tank.

Regarding individual controllers, I have often read the recommendation to simply keep them fully open. If this is so obvious, why are they apparently installed as standard?

Deliverer schrieb:

“Turning” any knobs.

I understand that people don’t turn knobs that aren’t there. Leaving them out avoids disputes with family members.

hampshire schrieb:

The threads about heat pump consumption and supply temperature settings are full of technical terms, values, and settings.

I really like that you are starting a separate thread about heat pumps for this reason 🙂

hampshire schrieb:

I have often seen the recommendation to simply open individual valves fully. If that’s so obvious, why are they apparently installed that way by default?

In an emergency, you can follow that advice—but by that point, you’ve already wasted thousands of euros on something else. So it’s rather impractical. The default setup exists because it has become mandatory under certain energy-saving regulations or standards. Lobbying is probably the main reason behind this. Perhaps also some resistance to change. In the past, it wasn’t quite as problematic to avoid heating.