Geothermal heat pump single-family house 200m² underfloor heating kfw55 - setting/optimization

Just two adults lying in bed produce about ~400 watts,

Maybe for 25 minutes :cool:, but otherwise the average person is at 120 watts (during the day/awake). At rest it is about 80 watts. Under the blanket at night as well, but thanks to the blanket insulation, even less of that reaches the room.

I find it baffling how one arrives at such values in the house. Yesterday, because I forgot, both floor-to-ceiling windows in the bedroom were tilted open, and we still had "only" 19°C in the bedroom. Just two adults lying in bed produce about 400 watts, which should noticeably raise the temperature in any new building after 6-8 hours.

The ventilation system alone evens out the temperature in the house quite well, or don’t you have one?

Which values do you mean? For me, it’s 20°C before airing and 18.5-19.5°C after airing (depending on duration and outside temperature). I don’t quite understand how one gets 16°C when airing. At near zero, I would have to leave it open for half the day.

By the way, I am also calming down a bit right now. I recalculated a bit more precisely and now come to almost 5 as COP for all heating consumers including distribution in the house. And we probably still haven't reached average winter temperatures. The compressor now consumes about 10kWh/d, but then the other consumers weigh less. However, it could already be that I end up somewhere around 4.5 after the winter.

Sorry, I meant the values from

[incl. electricity for heating pump and control of the heat pump? your values are similar to mine. but I am currently reading that the distribution via heating must be included. and for me, that alone is about 35W for the heating pump (which runs at subzero temperatures), 25W standby for the heat pump, ERR+-valves and the other pumps + heating pump that run during heating even draw 255W. This means that I have at least 25W continuously, the heating pump with 35W runs about 15% at ambient temperatures above 5° and 100% below 5°, and about 6h a day 255W are added. Roughly, that is 2kWh on heating days (rather more), 0.7kWh on summer days and probably about 1-1.5kWh in passive cooling mode. That of course significantly lowers the COP, especially for hot water
We have a Viessmann compact unit. It includes hot water and all sorts of pumps. Around it, we have nothing at all, no buffer, no additional pump, no circulation, nothing. ERR are powerless open, so they draw no power either. Since we do not have a heat pump meter, our COP values come from the Viessmann heat pump itself. And since everything is integrated there, I do hope very much that pump electricity and co are included. Of course, I do not know exactly how accurate these figures are.
Based on the total consumption (which I pull from the photovoltaic portal), I assume that we have about 150kWh base load per month as well as 25kWh each for hot water and ventilation. As soon as the heating is added, the monthly consumption rises in the transition period by about 100kWh – naturally more with severe subzero temperatures. Overall, this year for 170sqm and two people we will have about 1,800-2,000kWh heating electricity plus 300kWh hot water (incl. all pumps)... no idea if that is a lot.]

We have a Viessmann compact unit. It includes hot water and all kinds of pumps. Around it, we have nothing—no buffer tank, no additional pump, no circulation, nothing. ERR are electrically open, so they don’t consume any power. Since we don’t have a heat pump meter, our COP values come from the Viessmann heat pump itself. And since everything is integrated there, I really hope that pump power & co. are included. Of course, I don’t know how accurate these figures are. Based on total consumption (which I draw from the photovoltaic portal), I assume we have about 150 kWh base load per month and 25 kWh each for hot water and ventilation. As soon as the heating is added, monthly consumption rises by about 100 kWh during the transitional period—of course, more at sharp subzero temperatures. Overall, for 170 sqm and two people this year, we will have about 1,800–2,000 kWh heating electricity plus 300 kWh hot water (including all pumps)... no idea if that is a lot.

My heat pump "measures" not only the heat quantity for heating and hot water but also the "environmental energy." I assume this is an estimate based on the device having a certain COP and then expecting that from the ?determined? produced heat quantity, a CALCULATED amount of environmental energy is "withdrawn." I am assuming purely estimated values here and think it is similar for you. I would not expect your device to have a power consumption meter. Although it would, of course, be very easy for you to install a consumption meter and then really determine the annual performance factor. For comparison: I hope and think that for 5 people, 200 sqm, 2 bathrooms, including ventilation, we come to about 2,000 kWh over a year. But it will be exciting. Two questions remain unanswered, and I would be very happy if they could be addressed:

[*] Do you know or suspect how the heat pump determines the produced heat quantity? Are these estimates or measurements? If measurements, are they calibrated and reliable or just to serve as a reference? If not calibrated and reliable: how then is the annual performance factor calculated, since this necessarily requires the produced heat quantity?! [*] Does it make sense to heat completely unused rooms? This concerns unused individual rooms in the basement—not leaving the entire basement cold—and secondly the bedroom, which ideally should remain as cold as possible.