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.
P
pagoni202021 Jul 2020 08:21Joedreck schrieb:
The storage tank size is determined not by the number of people, but by the size of the solar thermal system.
It needs to be large enough because, especially in summer, the water heats up very quickly and the system stagnates. This puts a lot of stress on the heat transfer fluid in the system. Do you have any information on this or where I could read about it?
So far, I haven’t found anything on how the system could be damaged by a smaller water storage tank; I had assumed that excess solar-heated water is simply released, similar to a pressure relief valve.
Isn’t it actually the other way around—that the size of the solar thermal system is based on the calculated water demand?
Thanks.
halmi schrieb:
Why are you so worried about the hot water? We used exactly 114 kWh of electricity (measured with a separate meter) in the last two months. That’s not even quite $30 for two months, and that’s without considering the solar panels at all.Wait until winter. I don’t have any significant consumption now either. Our system has been running for 5 years already, and back then it wasn’t the latest model. Especially if it can’t modulate.pagoni2020 schrieb:
Do you have any information on this or know where I could read more about it?
So far, I haven’t found anything about how the system could be damaged by a smaller hot water storage tank; I had assumed that excess solar-heated water is simply released, similar to how a pressure relief valve works.
Isn’t it actually the other way around, that the size of the solar thermal system is determined by the calculated hot water demand?
Thanks. Google is your friend. Please also do your own research.