ᐅ New Single-Family Home Built to KfW55 Standard – Which Heating System to Choose?
Created on: 19 Jul 2020 12:19
T
Traube348
Hello everyone,
I have read many articles and would now like to benefit from the extensive knowledge of the members here.
A brief overview of my building project:
- Single-family house with approximately 160sqm (1,722 sq ft) of living space
- No basement, 2 full floors with an unfinished attic
- Relatively large window areas and an open-plan design with a staircase in the living area
- Underfloor heating throughout the house with tile flooring
- KfW 55 standard with timber frame construction
- A wood-burning stove will be installed
Unfortunately, I have little experience in this area and rely on recommendations from others regarding heating.
On the ground floor, we have a utility room of 8sqm (86 sq ft) where we would like to accommodate all the technical equipment.
The builder recommends installing a central ventilation system, which we would like to do.
Now to my question:
There is a gas connection in our building area, and a friend told me we should definitely heat with a gas boiler. To meet the KfW standard, according to the energy consultant, we still need to install 9sqm (97 sq ft) of solar panels on the roof.
A heating engineer friend advises: choose an air-to-water heat pump – split system Weishaupt LS 8-BREK – so you can avoid the solar requirement.
I have requested quotes for both options from different heating engineers, and they come out roughly the same in price.
Since I have heard many statements opposing air-to-water heat pumps, I tend to prefer gas.
However, the main challenge is the limited space in the utility room. In addition to the heating system, the two-flue fireplace, and the ventilation system, the electrical control cabinet as well as the washing machine and dryer are also planned to be located there.
Is there anyone who has faced a similar space issue?
What would you recommend?
Thank you very much in advance for your help.
I have read many articles and would now like to benefit from the extensive knowledge of the members here.
A brief overview of my building project:
- Single-family house with approximately 160sqm (1,722 sq ft) of living space
- No basement, 2 full floors with an unfinished attic
- Relatively large window areas and an open-plan design with a staircase in the living area
- Underfloor heating throughout the house with tile flooring
- KfW 55 standard with timber frame construction
- A wood-burning stove will be installed
Unfortunately, I have little experience in this area and rely on recommendations from others regarding heating.
On the ground floor, we have a utility room of 8sqm (86 sq ft) where we would like to accommodate all the technical equipment.
The builder recommends installing a central ventilation system, which we would like to do.
Now to my question:
There is a gas connection in our building area, and a friend told me we should definitely heat with a gas boiler. To meet the KfW standard, according to the energy consultant, we still need to install 9sqm (97 sq ft) of solar panels on the roof.
A heating engineer friend advises: choose an air-to-water heat pump – split system Weishaupt LS 8-BREK – so you can avoid the solar requirement.
I have requested quotes for both options from different heating engineers, and they come out roughly the same in price.
Since I have heard many statements opposing air-to-water heat pumps, I tend to prefer gas.
However, the main challenge is the limited space in the utility room. In addition to the heating system, the two-flue fireplace, and the ventilation system, the electrical control cabinet as well as the washing machine and dryer are also planned to be located there.
Is there anyone who has faced a similar space issue?
What would you recommend?
Thank you very much in advance for your help.
D
Daniel-Sp23 Jul 2020 13:08DaSch17 schrieb:
So, could you hang a standard water-based flat panel radiator in the bathrooms instead of an infrared heater and connect it to the heat pump’s heating system?
So, would it be better to invest in a larger photovoltaic system after all? No, don’t do that. The supply temperature is too low for the radiator! You won’t get enough heating output. I have a KfW 40 building envelope. My heating curve provides a supply temperature below 30°C (86°F) at an outdoor temperature of –10°C (14°F). At 0°C (32°F), it’s around 24.5°C (76°F). What heating output can a radiator deliver at those temperatures?
Not to mention the hydraulic issues you’ll cause.
If you want towel radiators, use ones with electric heating elements independent of the heat pump system. That way, you can quickly heat the bathroom as needed before showering.
DaSch17 schrieb:
180 m² (1,937 sq ft) living area For a KfW40 house, I would expect a maximum electricity consumption of about 2 kWh.
DaSch17 schrieb:
We were told that if the photovoltaic system is too large, it produces excess energy that is basically lost when the battery storage is full (especially during the warmer months). I also read somewhere that the ratio of battery storage to photovoltaic capacity should be approximately 1 kWp = 1 kWh. Since the electricity is sold, which is much more profitable than storing it, no energy is lost.
Also, a ratio between battery capacity and photovoltaic size only really makes sense as an upper limit.
A battery larger than 3–4 kWh hardly adds any benefit. In summer, it’s rarely used, and in winter, it often cannot be fully charged.
T
T_im_Norden23 Jul 2020 13:29No, no radiators.
Wall heating means underfloor heating installed in the wall.
Low flow temperature means 30°C (86°F) or less.
In new constructions, radiators are not combined with underfloor heating.
Wall heating means underfloor heating installed in the wall.
Low flow temperature means 30°C (86°F) or less.
In new constructions, radiators are not combined with underfloor heating.
In our quote, instead of an air-to-water heat pump, we have a ground-source water-to-water heat pump. It costs about 7,500 €. Does anyone have experience with a ground-source water-to-water heat pump? The plan is to drill 2 boreholes, each 90 m (295 ft) deep. The question is whether the additional cost is worth it. As a layperson, it seems logical to me that extracting heat from the ground is more efficient than from the air, especially during the winter months.
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