Air-water heat pump current consumption and data

While reading this discussion, I once again notice very clearly how different people are (e.g. strangely individual). For example, I cannot remember ever having used a thermometer in the house. It would have been my problem to tell the installer in which room I wanted which temperature. I couldn't say how warm it is in each room here, but it is just right. From the time of renting, I still remember very clearly how drastically differently something is perceived as a comfortable temperature. One person in the house argued with the radiator reading company because they had almost double the consumption compared to the rest of us. In the end, it turned out that they had multiple times the consumption especially in the bathroom. During a visit it became clear to me as well; it was warm in the apartment and when she opened the bathroom door, a real blast of heat came out. I believe that among all the calculations, a great (savings) potential can be found in very individual heating behavior, which partly differs completely and is perceived as "normal" and "necessary" by everyone. It is certainly similar with water, electricity, etc., or the often discussed fuel consumption of cars. A few unnecessary trips less or a little more discipline and the difference between consumption of 7.4 liters or 8.0 liters/100 km becomes irrelevant.

I want to chime in here. Here are the data: 200 sqm house. Modulating 8kW air-to-water heat pump with 100L buffer and mixing pump group. ERR on. Heating curve: 18° = 25° target return flow 0° = 30° target return flow -15° = 33° target return flow Consumption at -2° outdoor temperature over 24h was 29kWh Average run times 5 hours per cycle. Bathroom = 22.8°C other rooms = 22°C

That is similar to me in terms of temps, living space, and consumption. Only the bathroom I cannot get that warm, max. 21.5 degrees. And the many malfunctions...

While reading this discussion, I once again notice very clearly how different people are (e.g. I-weird). For example, I cannot remember ever having used a thermometer in the house. That would have been my problem, to tell the installer in which room I want which temperature. I could not say how warm it is here each time, but it is just right. From the time of renting, I still know exactly how drastically different something is perceived as a comfortable temperature. One person in the house argued with the meter reading company of the radiators because she had almost double the consumption compared to the rest of us. In the end, it turned out that she had a multiple consumption especially in the bathroom. During a visit, it also became clear to me; it was warm in the apartment, and when she opened the bathroom door, a real blast of heat came out. I believe that with all the calculations, a great (saving) potential can be found in the very individual heating behavior, which partly differs completely but is perceived by all sides as "normal" and "necessary". It is probably similar with water, electricity, etc., or the often discussed fuel consumption of cars. A few unnecessary trips less or a bit more discipline, and the difference between consumption of 7.4 liters or 8.0 liters per 100 km becomes irrelevant.

You may be right about that. But I don’t want to save at all. I don’t care. I want the heating to not produce any faults, last a long time, and heat well. I expect efficiency only as much as promised by the manufacturer minus a correction factor for installation quality. Financially, I don’t care whether it’s 800 or 1500 euros heating costs per year. That is lost in all the other payments anyway :)

No no, I didn’t mean you with that, it was more generally noticeable in many of the heat pump calculation examples discussed here and especially in the comparisons that it often also depends on one’s own behavior. I had already reported that we currently have a "plain old" gas heating system here with rather crude design, but the temperatures are right. The consumption values might not be exactly impressive but at least the heating does what it’s supposed to do. Here, for example, towel warmers were connected directly to the water system and you can turn it as much as you want, the thing always stays cold, so it’s more decorative. Well..... by now it’s just a temporary home.......

It is generally said that 1°C more increases electricity consumption by about 2.5%. In my opinion, ridiculously low and negligible. You really have to be patient with the setting changes. I basically always did it wrong! The more drastically you change the settings on the heat pump, the longer it takes to adjust. The so-called steady state is reached after 24-48 hours. The heat pump detects how much flow the pump delivers (which of course varies with active ERR) and then modulates accordingly down or up, depending on the requirement. It certainly takes about a day for that to run perfectly.

: I can really only recommend that you contact a technical office. They calculate the flow rates based on your desired room temperature, with which you can then perform the hydraulic balancing. Then you also see the total flow of the underfloor heating on which you can align the heat pump. You might possibly have to adjust the compressor capacity.

This is similar to me in terms of temps, living space, and consumption. I just can't get the bathroom as warm, max. 21.5 degrees. And the many malfunctions...

For me, the values of the heating curve indicate the return flow. You can add another 5k for the supply pipe ;-)