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.
I have your system and can tell you that during the handover, the HVAC technician asked me how I wanted the system to be set in case of a malfunction (a malfunction that does not resolve itself and persists) for both domestic hot water and underfloor heating. Specifically, in the event of a heat pump failure:
- No support from the electric backup heater for water and underfloor heating (everything stays cold)
- Support from the electric backup heater for water only, not underfloor heating (only hot water, underfloor heating stays cold)
- Support from the electric backup heater for underfloor heating only, not water (the opposite)
- And then there is the tricky option where the electric backup heater activates for both in case of a malfunction.
That means the electric backup heater runs continuously until you notice it, which usually doesn’t happen as everything appears to be working fine.
I would have had to sign off on this option with the technician.
Check your menu and try switching off the electric backup heater operation!
I didn’t see the answer to the question—does the billing period coincide with the screed drying?
Or follow @halmi’s advice.
- No support from the electric backup heater for water and underfloor heating (everything stays cold)
- Support from the electric backup heater for water only, not underfloor heating (only hot water, underfloor heating stays cold)
- Support from the electric backup heater for underfloor heating only, not water (the opposite)
- And then there is the tricky option where the electric backup heater activates for both in case of a malfunction.
That means the electric backup heater runs continuously until you notice it, which usually doesn’t happen as everything appears to be working fine.
I would have had to sign off on this option with the technician.
Check your menu and try switching off the electric backup heater operation!
I didn’t see the answer to the question—does the billing period coincide with the screed drying?
Or follow @halmi’s advice.
D
Diergarten27 Aug 2019 15:01Thanks to all of you for the great tips. I will try everything right away.
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