Underfloor heating air-water heat pump. House too warm when the sun shines

Whether you can really save with the wood, I simply doubt. It strongly depends on the respective prices and the efficiency.

COP including hot water? And do you actually find the heat pump great now?

As I already wrote, if I can run the heat pump 2 months less in total, then I'm at about a savings of an adjusted 300-400€. You just have to reduce a lot. The mass makes the difference.

Otherwise, today was a good day, lots of sun, therefore a lot of heat in the house without turning on the fireplace. The photovoltaic system delivered electricity, the battery was fully charged, and I will come to work by car tomorrow to be able to charge fully.

In total, only 297 kWh have been used this month so far. In September it was still 1030 kWh. So really a bad month.

I simply doubt whether you can really save with the wood. That strongly depends on the respective prices and the efficiency. COP including hot water? And do you now find heat pumps great after all?

Yes, including hot water, currently I find them good ...

As already written, if I can run the heat pump less for a total of 2 months, then I save about a cleaned-up 300-400€. You just have to consume a lot. It's the volume that counts. Otherwise, today was a good day, lots of sun, therefore lots of warmth in the house without turning on the fireplace. The photovoltaic system supplied electricity, the storage became full, and I can drive to work tomorrow with the car to fully charge it. In total, only 297 kWh were used this month so far. In September, it was still 1030 kWh. So a really bad month.

Sorry, I don't quite understand. You save at least 300€ by having 2 months "heat pump free" even though you have to buy wood? Just for comparison: Bookstar’s cost per kWh heat is currently about 6-7 cents. in the end, do you still recommend heat pumps?

The heat pump from actually does not seem to be set very efficiently. Such heating costs during the transitional period are already pretty harsh...

Currently, I have 24 degrees in the house from the basement to the upper floor. I played around a bit with the heat pump and my air-to-water heat pump handles a night setback well. From 5 pm to 8 am no cycles, from 9 am to 5 pm it ran continuously today and consumed 6.1 kWh. 0 kWh from the grid, 100% from photovoltaic and storage. I think that's pretty good. PS: for days between 0 and max 7 degrees AT.

So I can only speculate. But let's play this through. The charging station at work showed 11kWh charged last week after charging (remaining kilometers were 38km). That was roughly the remaining range I always had last autumn when I got home. Let's add a 2kWh buffer. That makes 13kWh for the car per day.

I can reconstruct the basic electricity consumption of the house (without showering, washing machine, dryer, dishwasher, TV, Alexas) quite well due to the vacation at the end of August. It was 5kWh per day for 10 consecutive days.

Thus, the bare house consumption without inhabitants and without heating but with car charging is 18kWh. Right?

On 16.02 & 26.02 I took photos of my supply meter: 4188kWh and 4428kWh. That means 240kWh grid consumption in 10 days with heating. So, heating and usage by 4 people in February (a winter month) accounted for an additional 6kWh.

Now some may think that I am fussing now under the assumption of the electric car and the basic supply. There were also days when over 30kWh went through. But the back payment annoyed me immensely at the beginning of this year. So this year I want to turn on the heat pump as late as possible.

It could also be that the advance payment for electricity was too low at 65€.

No idea, it was the first winter after all.