ᐅ Experience with KfW55 solid construction + gas heating + 5 sqm solar panels
Created on: 1 May 2017 20:11
N
Nutshell
Hello everyone,
I wanted to share my experience with my Kfw55 new build from 2013/2014.
We live at just under 300 meters (985 feet) above sea level and built with solid construction.
The house has a rather simple shape.
A standard gable roof without dormers or skylights (upstairs there is one window per room on the gable side).
Styrofoam was not an option for various reasons, so we chose the rather expensive monolithic plan blocks with a lambda value of 0.08.
Size: 111 sqm (1195 sq ft) living space.
Exterior wall: 36.5 cm (14 inches) Ytong blocks // Lambda 0.2 W/m²K
Floor slab insulated with XPS // 0.21 W/m²K
Ceiling on the upper floor has a sloping roof with 24 cm (9.5 inches) // ceiling insulated with 34 cm (13.5 inches) mineral wool // 0.12 W/m²K
Doors and windows are triple-glazed and gas-filled // overall including frames 1.05 W/m²K
Heat generator:
Gas condensing boiler: Viessmann Vitodens 300
System control: Vitotronic 200
Solar thermal system 5 sqm (54 sq ft): Vitosol 200-F
Solar storage tank: Vitocell 100-W 300 liters (79 gallons)
The solar system is used only for domestic hot water (no heating support).
Our gas boiler is switched off from May to September for heating and still consumes about 100 kWh of gas over the summer.
In winter, the solar system barely manages to heat the hot water (2 people), so it usually runs on gas.
Ventilation is handled by decentralized Lunos e² units with 90% heat recovery.
Over 12 months, we had a gas consumption of 8000 kWh.
That currently corresponds to heating costs of about €28 for the house.
We have the temperature set to 23°C (73°F) throughout the house.
(Electricity costs are about €39.)
Overall, we are very satisfied. Of course, the energy certificate shows lower consumption than we actually have.
There is no night setback, and nothing ever switches off or regulates down.
Maybe someone has had similar experiences?
Personally, I’m relaxed about heating costs; even if energy prices rise, paying twice as much would still be less than I used to pay in my smaller 80 sqm (860 sq ft) apartment built in 1990.
I wanted to share my experience with my Kfw55 new build from 2013/2014.
We live at just under 300 meters (985 feet) above sea level and built with solid construction.
The house has a rather simple shape.
A standard gable roof without dormers or skylights (upstairs there is one window per room on the gable side).
Styrofoam was not an option for various reasons, so we chose the rather expensive monolithic plan blocks with a lambda value of 0.08.
Size: 111 sqm (1195 sq ft) living space.
Exterior wall: 36.5 cm (14 inches) Ytong blocks // Lambda 0.2 W/m²K
Floor slab insulated with XPS // 0.21 W/m²K
Ceiling on the upper floor has a sloping roof with 24 cm (9.5 inches) // ceiling insulated with 34 cm (13.5 inches) mineral wool // 0.12 W/m²K
Doors and windows are triple-glazed and gas-filled // overall including frames 1.05 W/m²K
Heat generator:
Gas condensing boiler: Viessmann Vitodens 300
System control: Vitotronic 200
Solar thermal system 5 sqm (54 sq ft): Vitosol 200-F
Solar storage tank: Vitocell 100-W 300 liters (79 gallons)
The solar system is used only for domestic hot water (no heating support).
Our gas boiler is switched off from May to September for heating and still consumes about 100 kWh of gas over the summer.
In winter, the solar system barely manages to heat the hot water (2 people), so it usually runs on gas.
Ventilation is handled by decentralized Lunos e² units with 90% heat recovery.
Over 12 months, we had a gas consumption of 8000 kWh.
That currently corresponds to heating costs of about €28 for the house.
We have the temperature set to 23°C (73°F) throughout the house.
(Electricity costs are about €39.)
Overall, we are very satisfied. Of course, the energy certificate shows lower consumption than we actually have.
There is no night setback, and nothing ever switches off or regulates down.
Maybe someone has had similar experiences?
Personally, I’m relaxed about heating costs; even if energy prices rise, paying twice as much would still be less than I used to pay in my smaller 80 sqm (860 sq ft) apartment built in 1990.
Changing it every year is too stressful for me[emoji1] I’ve now signed up for everything with EON – gas and electricity. As a welcome gift, they’re currently offering a Weber gas grill. I’ve always wanted one of those; with it, you can really show off in the neighborhood.[emoji1]
Nordlys schrieb:
Changing providers every year is too stressful for me [emoji1]
I’ve now signed up with EON for both gas and electricity. As a welcome gift, they’re currently offering a Weber gas grill, which I’ve always wanted. That will definitely impress in the neighborhood. [emoji1]Switching once would be enough to save about 20-30% compared to the big providers.
Otherwise, switching takes 5 minutes. No exaggeration. You only need your address, name, and meter number.
Alex, together we need about 2600 kWh per year. Our current monthly advance payment with E.ON is 68,-. That’s just over 800,- per year. I expect it will be similar in the new house since we have the same fridge, lamps, washing machine, etc. If I find a provider offering it for 63 per month, I’d save 60 per year. But do I really want to deal with cancellation deadlines and all that? I’ve been through this with car insurance. Low introductory prices, then it goes up after a year. I got tired of that and have been with R and V for years now. They are steadily mid-priced. Karsten
markus27033 Aug 2017 12:09In terms of fees and actual costs, switching is rarely worthwhile – but for electricity, you can easily earn a bonus of around €200 (about $220) per year without much effort.
A good return for just a few clicks.
A good return for just a few clicks.
My estimated costs based on consumption over the last 12 months: 369€/year (30.75€/month)
I am quite satisfied with my E55 house.
The night setback is still skillfully ignored. Constant 23°C (73°F) in all rooms.
A KfW 40 house would theoretically be 8.38€ cheaper per month. The extra cost cannot really be justified...
Better to buy a few LEDs and save that money on the electricity bill.
I am quite satisfied with my E55 house.
The night setback is still skillfully ignored. Constant 23°C (73°F) in all rooms.
A KfW 40 house would theoretically be 8.38€ cheaper per month. The extra cost cannot really be justified...
Better to buy a few LEDs and save that money on the electricity bill.
D
Deliverer19 Oct 2017 14:02Already with the old KfW classification, heating costs alone could not justify any class above the standard. Electricity and gas are simply too cheap, and the standard is already too high.
And meanwhile (since 2016), everything has moved up another level. Anyone building above the standard now can no longer justify it economically. Possibly still ecologically – although opinions differ on that. Religiously, maybe it could still work!
And meanwhile (since 2016), everything has moved up another level. Anyone building above the standard now can no longer justify it economically. Possibly still ecologically – although opinions differ on that. Religiously, maybe it could still work!
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