Fourteen months ago, we took possession of our prefabricated house from the company Streif Haus after a construction period of nine months (including planning, the total was even 17 months). However, after one year, we noticed that the house consumes an unusually high amount of electricity (about 10,500 kWh in one year). Our photovoltaic system, including a battery storage unit, produced approximately 2,600 kWh, so nearly 8,000 kWh still had to be drawn from the grid. Previously, my wife, our 21-year-old daughter, and I lived in an almost equally large rental apartment and consumed about 2,500 kWh of electricity annually.
Our new house is equipped with the most modern and energy-efficient appliances (at least A+ rated), and all lighting is LED-based. In winter, we use a wood stove for heating, and in summer, we prepare food on the gas grill almost daily. Since we also do not heat excessively (always only at the lowest or second-lowest setting for the underfloor heating) and the ventilation system runs only occasionally and then only on the lowest level, we cannot understand the unusually high consumption.
Moreover, we had Streif Haus build us a KfW-40 Plus house, which is supposed to be especially energy-efficient. The company is not cooperative at all and does not take responsibility, instead placing the blame on our consumption, which, as mentioned, should actually be lower than in our previous rental apartment.
My question is: What is the typical electricity consumption in a KfW-40 Plus house with a photovoltaic system and battery storage for the ventilation system and the heat recovery unit?
Thank you in advance for your answers.
Achim D., 85395 Attenkirchen.
Our new house is equipped with the most modern and energy-efficient appliances (at least A+ rated), and all lighting is LED-based. In winter, we use a wood stove for heating, and in summer, we prepare food on the gas grill almost daily. Since we also do not heat excessively (always only at the lowest or second-lowest setting for the underfloor heating) and the ventilation system runs only occasionally and then only on the lowest level, we cannot understand the unusually high consumption.
Moreover, we had Streif Haus build us a KfW-40 Plus house, which is supposed to be especially energy-efficient. The company is not cooperative at all and does not take responsibility, instead placing the blame on our consumption, which, as mentioned, should actually be lower than in our previous rental apartment.
My question is: What is the typical electricity consumption in a KfW-40 Plus house with a photovoltaic system and battery storage for the ventilation system and the heat recovery unit?
Thank you in advance for your answers.
Achim D., 85395 Attenkirchen.
Hello Achim,
do you mean an air-to-water heat pump when you say air heat exchanger? Otherwise, you can check the model on the unit to determine the type of heating system.
Does the consumption still include construction power, for example for screed drying?
How large is the house?
Three people? Do you take many baths, or keep windows tilted open constantly in winter...?
Old chest freezer?
Otherwise, the first suspicion would be that the heat pump is running with an electric heating element.
do you mean an air-to-water heat pump when you say air heat exchanger? Otherwise, you can check the model on the unit to determine the type of heating system.
Does the consumption still include construction power, for example for screed drying?
How large is the house?
Three people? Do you take many baths, or keep windows tilted open constantly in winter...?
Old chest freezer?
Otherwise, the first suspicion would be that the heat pump is running with an electric heating element.
M
Mottenhausen27 Aug 2019 13:46halmi schrieb:
If he writes underfloor heating, it can’t be an air-to-air system.It wouldn’t be the first new build with air heating that has been equipped with a fully electric underfloor heating system (heating mats) to achieve a reasonably comfortable climate, typically in the bathroom. But then the meter really runs up if you try to heat the whole house that way...
M
Mottenhausen27 Aug 2019 13:51Until the original poster clarifies, your interpretation of the "air heat exchanger" is merely speculation.
D
Diergarten27 Aug 2019 14:08Thank you very much for the prompt responses. It is an air-to-water heat pump from alpha-Innotec. The house has approximately 150 m² (1,615 sq ft) of living space. We don’t have a chest freezer, only a state-of-the-art fridge-freezer combination with a freezer compartment. We generally don’t take baths, only shower once a day. But the idea of using the electric heating element might not be a bad one either. I’ll have to look into that. How can I find out?
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