Difference in purchase cost between gas pump or heat pump

  • Erstellt am 2019-12-14 15:33:02

hegi___

2019-12-18 14:39:21
  • #1


How much electricity do you have to purchase annually with how many m² of living space?
And what is your annual performance factor?



By smart I meant rather intelligently controlled and not necessarily with smart home.
It goes in the direction of what described.
 

ludwig88sta

2019-12-18 14:43:13
  • #2
I do hope that from now on only those heat pumps are installed that are intelligently controlled ("smart"). Anything else would be a waste of money (at least currently with the feed-in tariff, etc.)!?
 

world-e

2019-12-18 14:55:45
  • #3

Unfortunately, I cannot provide complete values yet, as we only moved in at the end of February 2019.
KfW40 house with controlled residential ventilation
143 m² living space, plus approx. 70 m² basement. Everything except the storage room in the basement is heated with underfloor heating. In the main bathroom, there is additionally wall heating.
Standard outside temperature -16°C (postal code 88***)

01.01.2019 to 01.12.19:
Produced heat 7216 kWh
Electrical work 1867 kWh
Annual performance factor 3.86

The annual performance factor could presumably be higher, but due to the very well insulated house, the hot water preparation has a higher impact on the annual performance factor.

At the beginning, the heating element for defrosting was still activated, which used quite a bit of electricity. However, it has been off for a long time.

Photovoltaics: 9.74 kWp
Current values 2019 to today:
Photovoltaic production: 11070 kWh
Direct consumption: 1490 kWh
Fed in: 9580 kWh
Electricity purchased from the grid: 2386 kWh (total household electricity)
 

boxandroof

2019-12-18 15:03:31
  • #4
We have also installed the Geisha (the new one) since the beginning of 2018:
- clean a filter once a year, otherwise no maintenance
- if it breaks, it is simply bought new, 2500€
- heating element is disconnected (-12 Norm AT, so relatively mild)
- I have not done anything myself, except programming and commissioning

I have refrained from smart control for photovoltaics; in my opinion, it doesn't help. I ensure that it ALWAYS runs during the day in the heating period - for me from 9 am to at least 8 pm. Because then it is warmer and the sun could shine. At night, when it is coldest, it turns off for 6 to 11 hours depending on the outside temperature. If it is very cold, it runs continuously. I shift the heating curve accordingly by timer.

Throughout the year, maybe 30% of the heating and hot water is contributed by photovoltaics.

You can also simply run it 24/7.
 

world-e

2019-12-18 15:56:40
  • #5

But you procured it yourself? It would probably be more expensive through a heating installer.
 

boxandroof

2019-12-18 16:03:02
  • #6
I bought them myself, but only because I couldn't find anyone who wanted to sell and install them for me. I would have paid more.

The heating engineer did everything else: underfloor heating and hydraulics – so everything in the house – and kindly also the 2 water-carrying pipes up to the heat pump outside. But of course, it's excluded from warranty etc.
 

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