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.
halmi schrieb:
Why are you all getting so worked up 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 30€ for two months, and that doesn’t even include the solar panels yet. Well, that’s already 114 kWh more than with a gas boiler. Here, exactly 0 kWh have been used for hot water since March.
It also depends on user behavior. One household may need 50 liters (13 gallons) of hot water every 24 hours, while another uses 500 liters (132 gallons), and that can completely change the calculation for the heat pump’s energy consumption.
P
pagoni202021 Jul 2020 10:37Joedreck schrieb:
Google is your friend. Please also research on your own. That very friend had phrased it differently, which is why I was interested in the position you wrote about it.
P
pagoni202021 Jul 2020 10:39Mycraft schrieb:
Well, that’s already 114 kWh more than with a gas boiler. Here, exactly 0 kWh for hot water since March.
It also depends on user behavior. One household might need 50 liters (13 gallons) of hot water every 24 hours, while another uses 500 liters (132 gallons), and that can completely change the entire calculation with a heat pump. Exactly – as with almost all calculations and requirements in home construction. The dosage makes the poison, so to speak, or the completely different lifestyles change the specific demand.
halmi schrieb:
Why are you getting so worked up about the hot water? We used exactly 114 kWh of electricity (measured by a separate meter) in the last two months. That’s not even 30€ for two months, and that doesn’t even take the solar panels into account yet.Okay, since April I’ve bought 33 kWh for everything, and during sunny days I have water heated to 57°C (135°F).
The topic of domestic hot water is indeed frustrating with heat pumps. You can’t set the temperature too high, otherwise it’ll consume a lot of energy. And if you want to take a bath while the water is just starting to heat up, in the worst case, you end up with a cold tub. Also, the costs for hot water in winter are quite significant.
With gas, it’s much easier. I just don’t understand why these electricity-guzzling systems are making a comeback. In the 1980s, the industry tried it as well, but back then there were no pointless subsidies for these units.
Okay, I’ve complained enough, but you can live with it. However, you definitely experience a loss of comfort or very high consumption. Both contradict each other. Finding the optimum setting is difficult; it took me six months, and considering the time I spent on it, you better not calculate an hourly wage for it.
With gas, it’s much easier. I just don’t understand why these electricity-guzzling systems are making a comeback. In the 1980s, the industry tried it as well, but back then there were no pointless subsidies for these units.
Okay, I’ve complained enough, but you can live with it. However, you definitely experience a loss of comfort or very high consumption. Both contradict each other. Finding the optimum setting is difficult; it took me six months, and considering the time I spent on it, you better not calculate an hourly wage for it.
P
Pinkiponk22 Jul 2020 09:46Bookstar schrieb:
I just don’t understand why these energy guzzlers are coming back. Honestly, I am still trying to figure out the reasons and hope to know more about this in a few years. There certainly must be an incredible market power behind it, the marketing is impressive.
Similar topics