ᐅ Typical energy consumption based on practical experience?
Created on: 18 Jun 2013 21:50
G
Gabi&Gerold
Hello everyone,
We are new here, and unfortunately, the reason is not a happy one. I would like to continue working on my outdoor area but, to my frustration, I have to deal with this online.
We have been living for a year now in a low-energy prefabricated house. The Vitocal 200 heating system has already had several failures, with customer service disappointing us repeatedly. (We expect more from our apprentices.) But that is a different topic.
From the beginning, I had the impression that the air-source heat pump consumes quite a lot of energy. This was repeatedly denied, and I was referred to the year-end statement from my energy provider. Now I have checked the meter myself and almost fainted: 5500 kWh of electricity consumption just for the heat pump in one year!
Before receiving the usual "relative explanations" from the manufacturer that I’m used to, here is some information about us:
We live in the Southwest Palatinate region (together with Mainau, the warmest area in Germany).
We are both working full-time, only occupying the house in the evenings, and only one person showers.
The set temperature is 20°C (68°F).
The blower door test was passed with very good results.
The house is ventilated by opening windows 3-4 times a day; otherwise, the windows remain closed.
The prefabricated home provider advertises this house with heating costs of €36 per month, which corresponds to approximately 2080 kWh annually based on the EON tariff.
Their calculation is based on 22°C (72°F) in the living room and bathroom, 20°C (68°F) in the kitchen and children’s room, and 18°C (64°F) in the bedroom and other rooms.
We maintain 20°C (68°F) in the living room and bathroom; the heating in the children’s, bedrooms, and adjacent rooms is turned off. Most of the doors on the upper floor remain closed.
We think that with these settings, we are on the energy-saving side, which is why I am so surprised by our energy consumption despite the harsh winter.
As a solution, a service technician suggested lowering the set temperature even further! He was serious about this.
Since the provider does not take our complaints seriously and either does not respond or only replies after weeks, we are now looking for support here.
Who else lives in a comparable prefabricated house? What is your energy consumption? Please post! I need comparative figures to assert myself against my provider.
If you have neighbors living in such a house, please ask them and share their consumption here.
Thank you in advance for your responses.
We are new here, and unfortunately, the reason is not a happy one. I would like to continue working on my outdoor area but, to my frustration, I have to deal with this online.
We have been living for a year now in a low-energy prefabricated house. The Vitocal 200 heating system has already had several failures, with customer service disappointing us repeatedly. (We expect more from our apprentices.) But that is a different topic.
From the beginning, I had the impression that the air-source heat pump consumes quite a lot of energy. This was repeatedly denied, and I was referred to the year-end statement from my energy provider. Now I have checked the meter myself and almost fainted: 5500 kWh of electricity consumption just for the heat pump in one year!
Before receiving the usual "relative explanations" from the manufacturer that I’m used to, here is some information about us:
We live in the Southwest Palatinate region (together with Mainau, the warmest area in Germany).
We are both working full-time, only occupying the house in the evenings, and only one person showers.
The set temperature is 20°C (68°F).
The blower door test was passed with very good results.
The house is ventilated by opening windows 3-4 times a day; otherwise, the windows remain closed.
The prefabricated home provider advertises this house with heating costs of €36 per month, which corresponds to approximately 2080 kWh annually based on the EON tariff.
Their calculation is based on 22°C (72°F) in the living room and bathroom, 20°C (68°F) in the kitchen and children’s room, and 18°C (64°F) in the bedroom and other rooms.
We maintain 20°C (68°F) in the living room and bathroom; the heating in the children’s, bedrooms, and adjacent rooms is turned off. Most of the doors on the upper floor remain closed.
We think that with these settings, we are on the energy-saving side, which is why I am so surprised by our energy consumption despite the harsh winter.
As a solution, a service technician suggested lowering the set temperature even further! He was serious about this.
Since the provider does not take our complaints seriously and either does not respond or only replies after weeks, we are now looking for support here.
Who else lives in a comparable prefabricated house? What is your energy consumption? Please post! I need comparative figures to assert myself against my provider.
If you have neighbors living in such a house, please ask them and share their consumption here.
Thank you in advance for your responses.
Great.
We, as inexperienced beginners, are stuck in a housebuilding nightmare.
And by now, one thing is certain: our trust in everyone involved in the construction process is well below zero.
All the knowledge we’ve had to gain through the internet over the past few months was just to find out that the "professionals" either did the work incorrectly or didn’t do it at all.
For example, someone (architect?) completely forgot to design the grounding system.
The plumber installed 80% of the water pipes without insulation.
The underfloor heating hasn’t been installed yet. What should I know? I only trust the workers as far as I can spit.
From this week on, I will have all work inspected by an independent expert.
But if I can prevent further mistakes early on...
We have ceiling heating in the basement (except the storage room) and on the ground floor.
The upper floor and attic will get underfloor heating.
We originally wanted an air source heat pump from Ochsner because they are supposedly very efficient.
However, the heating system type always planned by the prefab house company—or included in the offer—was only Rotex or Mitsubishi.
Since the latter is more efficient, we chose it.
But considering how the whole construction is going, it would be a surprise if even that turns out well.
Nobody is competent, from the architect to the "construction manager" or the responsible regional representative of the prefab house company.
We, as inexperienced beginners, are stuck in a housebuilding nightmare.
And by now, one thing is certain: our trust in everyone involved in the construction process is well below zero.
All the knowledge we’ve had to gain through the internet over the past few months was just to find out that the "professionals" either did the work incorrectly or didn’t do it at all.
For example, someone (architect?) completely forgot to design the grounding system.
The plumber installed 80% of the water pipes without insulation.
The underfloor heating hasn’t been installed yet. What should I know? I only trust the workers as far as I can spit.
From this week on, I will have all work inspected by an independent expert.
But if I can prevent further mistakes early on...
We have ceiling heating in the basement (except the storage room) and on the ground floor.
The upper floor and attic will get underfloor heating.
We originally wanted an air source heat pump from Ochsner because they are supposedly very efficient.
However, the heating system type always planned by the prefab house company—or included in the offer—was only Rotex or Mitsubishi.
Since the latter is more efficient, we chose it.
But considering how the whole construction is going, it would be a surprise if even that turns out well.
Nobody is competent, from the architect to the "construction manager" or the responsible regional representative of the prefab house company.
Check the BAFA website – they provide up-to-date heat pumps with their COPs. For more detailed information, I also recommend the pink forum.
When designing the heating system and piping, make sure your heating specialist performs a room-by-room heating load calculation – don’t accept a vague “15 cm (6 inches) pipe spacing everywhere” approach. Verify the planned heating system by considering the U-value and conducting a heating load calculation for the entire building using a heating demand calculator (you can find the required values in the Energy Saving Ordinance documentation).
When designing the heating system and piping, make sure your heating specialist performs a room-by-room heating load calculation – don’t accept a vague “15 cm (6 inches) pipe spacing everywhere” approach. Verify the planned heating system by considering the U-value and conducting a heating load calculation for the entire building using a heating demand calculator (you can find the required values in the Energy Saving Ordinance documentation).
B
Bauexperte30 Mar 2015 01:40Good evening,
There must be a reason why you chose "your" provider; maybe the explanation lies in that choice?
Regards, Bauexperte
cartime schrieb:That’s a good idea!
Have all work from this week onward inspected by an independent expert. But if I can already prevent the next mistakes during the preliminary work...
cartime schrieb:In my experience, they just relocate where the noise occurs.
I originally wanted an air source heat pump from Ochsner because they are supposedly very efficient.
cartime schrieb:With Rotex, I know you’re not dealing with a bad provider, as long as the system is adapted to the house’s energy calculation. I have no experience with Mitsubishi.
But the heating system type that the prefab house company always plans for or includes in their offer is only Rotex or Mitsubishi. The latter is more efficient, so we chose that one.
cartime schrieb:Generalized statements like these are not helpful and do no one any favors, not even you.
Nobody is competent. From the architect to the "construction manager" or the responsible regional representative of the prefab company.
There must be a reason why you chose "your" provider; maybe the explanation lies in that choice?
Regards, Bauexperte
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