Electricity consumption heat pump experiences?

Hello Michael,

I cannot offer the same heat pump, but one from Dimplex as well. Maybe my values will help you a bit for comparison. Of course, I also look forward to an assessment from other forum participants.

Model: Dimplex LA 12 STU

We live in BaWü near Stuttgart
House built in 2020 (completed), 32er Poroton T10 bricks, no additional insulation
205 sqm living space on 3 floors (basement with entrance, hallway, guest room, office)
a lot of home office
all rooms have all thermostats fully open at all times, control only via the flow temperature. In the main bathroom, we heat in the cold months in the morning and evening for 1.5 hours with the towel radiator (infrared).
In the house, when heated, we generally have about 22-22.5 degrees in all rooms. Only in the basement rooms usually 0.3 degrees less.
The bedroom is the only room where we turn the thermostat down.

Since we reset all values exactly one year ago and I have also recorded monthly values and partly optimized a bit, I can say quite precisely what is set. However, we only have one meter because we also use a photovoltaic system for heating. So I cannot separate household electricity and heat pump electricity but can estimate quite well.

In 2022, we only fully heated in the months January-April and November + December. In between, the heating ran only on individual days during the transition months. In total, about 20 days.

Residents: 2 adults, 2 small children, a lot of home office

We set the hot water to 45 degrees during the day. At night, from 10 p.m. to 9:30 a.m., we reduce it to only 39 degrees with a night setback.
Once a week, we run a thermal disinfection at 60 degrees.
We mostly shower, bathe rather less.
We only run the circulation pump for 1 hour each morning before getting up, at noon, and in the evening before showering.

All in all, it’s not the case that we are freezing anywhere or renouncing warm water; it’s very comfortable living.
We have no residential ventilation but usually air out briefly in the morning and evening.

Occasionally we use a fireplace to heat, but this is more a decorative fireplace in the living room and on only 3-4 days a week, rather than a heating replacement.
This is due to the children, who might otherwise burn their fingers.

We have the following consumptions:
Total electricity 8300 kWh
of which about 4000 kWh (we do a lot of washing and drying, cook a lot) household - thus 4300 heat pump
The photovoltaic system has 9.6 kWp. Because of it, we were able to obtain about 2500 kWh of electricity and thus only had to buy the difference of around 5800 kWh.

Heat pump values:
Currently at -2 degrees outside
25.2 degrees return flow
24.8 flow
23.8 target

Water target 39 (night setback)
Actual: 43

Heat quantities (all values refer to 15.12.21 - 14.12.22)
Total: 13016 kWh
Heating: 4966 kWh
Hot water: 8050 kWh
Environmental energy: 9531 kWh

Unfortunately, the operating times were not reset at the last inspection. Therefore, I cannot provide annual values here.

As mentioned, I look forward to an assessment from third parties as well.

One more addition: the hot water storage tank has 300 liters and 100 liters are buffer tanks Floor heating installed with a distance of 10 cm

We have the following consumptions:
Total electricity 8300 kWh
of which about 4000 kWh (we wash and dry a lot, cook a lot) household - thus 4300 heat pump

Heat quantities (all values refer to 15.12.21 - 14.12.22)
Total: 13016 kWh
Heating: 4966 kWh
Hot water: 8050 kWh
Environmental energy: 9531 kWh

Unfortunately, the operating times were not reset during the last review. Therefore, I cannot provide annual values here.

As said, I am also looking forward to an assessment from third parties.

Hello,
how accurate is the estimate for the heat pump consumption then? Of course, an intermediate meter would be better.

This results in an annual performance factor of about 3.

What power does the heat pump have and does it modulate its power?
Thermal disinfection in a single-family house is hotly debated. Have you thought about it and consciously decided on it?

Regards

Hi,
how accurate are the estimates for the consumption of the heat pump? Of course, an intermediate meter would be better.

It results in an annual performance factor of about 3.

What is the output of the heat pump then and does it modulate the output?
Thermal disinfection in a single-family house is hotly debated. Have you thought about it and consciously decided on it?

Regards

hi,

Output 12 KW
Thermal disinfection is more for my wife’s sake. It was also recommended to us by the heating engineer. According to my research, it is actually not really necessary and could still offer saving potential :)
Consumption: in our apartment with one child and 160 sqm, we had about 3200 kWh electricity consumption. Now we have one more child, one large fridge/freezer combo more, a few more lights (although all LED now and also before) more HO, a bit of garden lighting. Overall, we wash and dry more (thanks to the photovoltaic system) and use our steam cooker a lot, which we did not have before. So I estimate that the consumption of 4000 kWh is not unrealistic. (household electricity)

Not modulating. Today, with much more knowledge about it, I would do it differently. But well, you learn from mistakes.

Overall, I find the values quite okay for the house size; especially when I look at the low flow temperatures and the small spread in temperatures.

At the read values, your heat pump was off.

2. Heat generator: 153 hours (since activation of the heating around October 2020)
Flange heating: 238 hours (since activation of the heating around October 2020)

Uh?? Honestly, I haven't read every post exactly... but what is that?
To me, flange heating is a heating element.
I'll read through the thread again later at my leisure, but for my layman's understanding, that sounds strange.