ᐅ Vitocal 300 A – in use for over a year now. I have a few questions...
Created on: 18 Jan 2016 19:13
S
sucksgsh
Hello everyone,
I have been living in our KfW 70 house since September 2014 and now have a few questions about heating.
I have a Vitocal 300 air-to-water heat pump installed indoors in the basement.
There is also a 200L (53 gallons) hot water tank connected.
The underfloor heating covers about 130m² (1400 ft²).
The room temperature is set to 21 degrees Celsius (70°F). So far, there has been no night setback.
The heating curve settings are: slope 0.4 – level 0K.
The seasonal performance factor displayed is 4.3.
The domestic hot water temperature is 55 degrees Celsius (131°F).
During this period, I have used about 5000 kWh of electricity – which seems quite high to me.
Additionally, the compressor has already run for 3800 hours and has cycled 1800 times. Assuming a lifetime of 40,000 hours, that would amount to just about 10 years.
Is this normal? The electricity consumption and compressor operating hours seem relatively high to me.
Unfortunately, I am a complete beginner when it comes to heating and have relied entirely on my heating technician. Hopefully, I can find some answers here.
I was told it might be normal to heat more in the first year because the house is not fully dried yet (brick construction).
Thanks and best regards
I have been living in our KfW 70 house since September 2014 and now have a few questions about heating.
I have a Vitocal 300 air-to-water heat pump installed indoors in the basement.
There is also a 200L (53 gallons) hot water tank connected.
The underfloor heating covers about 130m² (1400 ft²).
The room temperature is set to 21 degrees Celsius (70°F). So far, there has been no night setback.
The heating curve settings are: slope 0.4 – level 0K.
The seasonal performance factor displayed is 4.3.
The domestic hot water temperature is 55 degrees Celsius (131°F).
During this period, I have used about 5000 kWh of electricity – which seems quite high to me.
Additionally, the compressor has already run for 3800 hours and has cycled 1800 times. Assuming a lifetime of 40,000 hours, that would amount to just about 10 years.
Is this normal? The electricity consumption and compressor operating hours seem relatively high to me.
Unfortunately, I am a complete beginner when it comes to heating and have relied entirely on my heating technician. Hopefully, I can find some answers here.
I was told it might be normal to heat more in the first year because the house is not fully dried yet (brick construction).
Thanks and best regards
sucksgsh schrieb:
Unfortunately, I can’t log data directly from my heat pump—I have to record everything manually and I often forget. Over the past four days, I’ve used about 21 kWh per day.
During the day, it’s around -4°C (25°F) and at night about -10°C (14°F). I’ll try to keep daily records.Hi sucksgsh,
Considering the outdoor temperatures you mentioned, I find a daily electricity consumption of 21 kWh quite (extremely!) high. Could that possibly be the total consumption over the four days you mentioned?
Best regards,
Thorsten
P
Peanuts7422 Jan 2016 12:37T21150 schrieb:
Hi sucksgsh,
despite the outside temperatures you have, I consider an electricity consumption of 21 kWh per day to be very (extremely!) high. Could that perhaps have been the consumption over the mentioned 4 days?
Best regards,
ThorstenAt an average outside temperature of -7°C (19°F), only 5 kWh per day?
That seemed a bit unrealistic to me.
Peanuts74 schrieb:
At an average outdoor temperature of -7°C (19°F), 5 kWh per day?
That seemed a bit unrealistic to me.Errata: You are right. My mistake.
The value is realistic, I made a reasoning error this morning.
Sorry.
sucksgsh schrieb:
Hello. No, it’s 20 kWh per day. But it’s really freezing cold here as well. Currently it’s -13°C (9°F)Yes. That fits too! As I said, that was my mistake this morning. Best regards, Thorsten
Hi
I’m following with interest because I decided against an air-source heat pump and chose a gas condensing boiler with a solar thermal system for domestic hot water.
In my detached, single-story bungalow of 101 m² (1,088 sq ft) built to KfW 70 standard from 2013, I used 10,000 kWh of gas in the first year. The living room/kitchen was around 22°C (72°F), and the bathroom 23°C (73°F). The location is in the Voreifel region near Euskirchen, approximately 200 m (650 ft) above sea level.
Heating curve slope is 0.8—recently adjusted down to 0.6 as a test—and shift is 4 K. The drying phase after plastering is not included.
Given the difference in gas and electricity prices of about 1:4, it seems I made the right choice, assuming the air-source heat pump doesn’t exceed a ratio of 1:3 for electrical energy input to heating energy output. Even if I include the electricity used by pumps and controls in the gas heating system, as I should, the air-source heat pump never seems to pay off.
Or have I overlooked something like maintenance costs? These do apply to heat pumps, right?
I’m following with interest because I decided against an air-source heat pump and chose a gas condensing boiler with a solar thermal system for domestic hot water.
In my detached, single-story bungalow of 101 m² (1,088 sq ft) built to KfW 70 standard from 2013, I used 10,000 kWh of gas in the first year. The living room/kitchen was around 22°C (72°F), and the bathroom 23°C (73°F). The location is in the Voreifel region near Euskirchen, approximately 200 m (650 ft) above sea level.
Heating curve slope is 0.8—recently adjusted down to 0.6 as a test—and shift is 4 K. The drying phase after plastering is not included.
Given the difference in gas and electricity prices of about 1:4, it seems I made the right choice, assuming the air-source heat pump doesn’t exceed a ratio of 1:3 for electrical energy input to heating energy output. Even if I include the electricity used by pumps and controls in the gas heating system, as I should, the air-source heat pump never seems to pay off.
Or have I overlooked something like maintenance costs? These do apply to heat pumps, right?
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