ᐅ Experiences with heat pump electricity consumption?

WilderSueden schrieb:

That actually sounds quite reasonable. I just can’t understand how around 7000 kWh of heat translates into 5700 kWh of electricity. That would mean the heat pump has a seasonal performance factor of 1.22.
Do you have the electricity consumption data for each month this year?

I have no idea how reliable that estimate is. But I would guess that the electric heating element is actively involved here.
The question is how exactly the setup is configured. Is there an integrated electric heater, possibly built into the hot water storage tank?

238 hours of electric heating might be around 2000 kWh. If the heat pump had produced that heat, it would have been about 666 kWh (with a seasonal performance factor of 3).

However, the description with a second heat source also sounds strange to me (besides the flange heater). For me, the second heat source is the electric heater integrated into the heat pump. It ran for about 7 hours, mostly by accident, on the first day of installation.

So I would first find out what components are installed here and how. Then clarify what each heat source is doing. After that, check whether this is really necessary. Your heat pump has enough capacity to manage that without the electric heater. The question then would be if it’s as simple as just disabling the electric heater. But for a new system, I would simply contact my heating installer to sort this out.

Alessandro schrieb:

with the recorded values, your heat pump was turned off.

Here is an additional note :-) I am not an expert.
Currently, the display shows heating
-2.5°C (27.5°F) outside
25.2°C (77.4°F) return flow
28.8°C (83.8°F) supply flow
23.8°C (74.8°F) target temperature

face26 schrieb:

No idea how accurate the estimate is. But I’m just guessing that the electric heating element is actively involved here.
The question is how exactly the setup looks. Is it an integrated heating element, possibly built into the storage tank?

238 hours of the heating element might be about 2000 kWh. If the heat pump had done that, it would have been around 666 kWh (with a COP of 3).

But even the description of a “second heat source” seems odd to me (alongside the flange heater). For me, the second heat source is the heating element integrated into the heat pump. It ran for 7 hours so far, mostly by accident on the first day of installation.

So I would first find out exactly what is installed here. Then clarify which heat source is responsible for what. Then see if that is necessary. Your pump has enough capacity to manage without the heating element. The question is whether simply disabling the heating element is enough. With a new system, I would just contact my installer about this.

The mentioned text passages also caught my attention. And I don’t see hygienic disinfection against Legionella as necessary in a single-family house. Our heating element only ran for a few hours until the manufacturer’s service properly commissioned the brine heat pump and then deactivated the heating element (after briefly noting that they technically weren’t allowed to do that, but did it anyway because they knew the activated heating element was nonsense).

face26 schrieb:

No idea how accurate the estimate is. But I’m just guessing that the heating element is actively involved here.
The question is, what exactly does the setup look like? Is it an integrated heating element, possibly built into the storage tank?

238 hours of heating element runtime might be around 2000 kWh. If the heat pump had done that, it would have been about 666 kWh (assuming a COP of 3).

But the description mentions a second heat generator, which seems odd to me (alongside the flange heater). For me, the second heat generator is the heating element integrated into the heat pump. It ran for 7 hours so far and that was mostly by accident on the first day of installation.

So I would first find out exactly what is installed here. Then clarify which heat generator is doing what. And after that, see if that’s necessary. Your pump is powerful enough to handle this without the heating element. The question then would be whether simply disabling the heating element is enough. But with a new system, I would just contact my heating technician.

Yes, I think the next step is to find out what the deal is with the second heat generator and the flange heater. Regarding thermal disinfection, I also need to reconsider whether we might turn that off.

BauMixx schrieb:

Hello,

Output 12 kW
Thermal disinfection is mostly for my wife’s peace of mind. It was also recommended to us by the heating technician. However, based on my research, it’s actually not necessary and could offer some savings potential 🙂
Consumption: In our 160 m² (1722 sq ft) apartment with one child, we had about 3200 kWh electricity consumption. Now we have one more child, an additional large fridge/freezer combo, a few more lights (all LED both before and now), a home office, and some garden lighting. Overall, we wash and dry more (thanks to the photovoltaic system) and use our steam oven a lot, which we didn’t have before. So I estimate that a consumption of around 4000 kWh is realistic. (Household electricity)

Not modulating. If I had more knowledge back then, I would do it differently now. But well, you learn from mistakes.

Overall, I think the values for the house size are quite reasonable; especially when I look at the low supply temperatures and the small temperature spread.

Our household electricity consumption for 2022 is currently about 3800 kWh as well. Also a 4-person household, 2 adults + 2 small children, freezer, second refrigerator, etc.