H
Honigkuchen9 Jan 2009 10:27Hello,
you mention both producing hot water and heating with gas—are you primarily interested in cost-effective hot water production, affordable heating, or both?
Take a look here, I just wrote this earlier (topic: geothermal energy; but I also addressed solar thermal systems):
https://www.hausbau-forum.de/Sanitär-heizung-holzbau-dachdecker/1054-und-fuer-heizsystem-2.html#post7020
- Just briefly:
You need about 50 to 100 liters (13 to 26 gallons) of hot water storage per person in the household.
You need about 1 to 1.5 square meters (11 to 16 square feet) of collector area per person, depending on the type of collector (and roof pitch/orientation, etc., possibly more may be required).
For four people, you would usually need around 6 square meters (65 square feet) of collector area in total.
It’s different if you also want to use it for heating.
You need roughly 1 square meter (11 square feet) of collector area per 5 square meters (54 square feet) of living space, according to one of my home construction advisory books.
For heating, you will need alternative solutions—but have a read through the post; you might find some good ideas there.
Get free energy consulting from a consumer advice center near you!
Best regards
you mention both producing hot water and heating with gas—are you primarily interested in cost-effective hot water production, affordable heating, or both?
Take a look here, I just wrote this earlier (topic: geothermal energy; but I also addressed solar thermal systems):
https://www.hausbau-forum.de/Sanitär-heizung-holzbau-dachdecker/1054-und-fuer-heizsystem-2.html#post7020
- Just briefly:
You need about 50 to 100 liters (13 to 26 gallons) of hot water storage per person in the household.
You need about 1 to 1.5 square meters (11 to 16 square feet) of collector area per person, depending on the type of collector (and roof pitch/orientation, etc., possibly more may be required).
For four people, you would usually need around 6 square meters (65 square feet) of collector area in total.
It’s different if you also want to use it for heating.
You need roughly 1 square meter (11 square feet) of collector area per 5 square meters (54 square feet) of living space, according to one of my home construction advisory books.
For heating, you will need alternative solutions—but have a read through the post; you might find some good ideas there.
Get free energy consulting from a consumer advice center near you!
Best regards
Hello, a solar thermal system only becomes cost-effective over time. From an economic perspective, a solar system initially appears uneconomical. If energy prices rise sharply, the cost of materials also increases – and suddenly it becomes uneconomical again, whereas a system installed in advance gradually pays off.
One aspect that is often overlooked is the increase in material and transportation costs when energy prices go up. Since a solar system consists of a lot of metal, copper, etc., these products, which require a lot of energy to produce, immediately become more expensive (copper-DEL), making it less cost-effective. Best regards
One aspect that is often overlooked is the increase in material and transportation costs when energy prices go up. Since a solar system consists of a lot of metal, copper, etc., these products, which require a lot of energy to produce, immediately become more expensive (copper-DEL), making it less cost-effective. Best regards
Hello,
this might be of interest, but I have seen elsewhere that new subsidy rates for solar thermal systems have been in effect since the beginning of the week. In particular, the basic subsidy has been increased from 90 to 120 euros per square meter (m2).
From today until the end of the year, the following new MAP subsidy conditions apply for solar collectors and also for air collectors:
1. (Temporary) increase of the basic subsidy for solar collectors used for combined domestic hot water and space heating to 120 euros per square meter (m2) until December 30, 2011; after that date, the subsidy will return to 90 euros/m2.
2. The previously temporary boiler replacement bonus (bonus for replacing an old non-condensing boiler with a new condensing boiler) will be extended indefinitely but will be gradually reduced. The bonus amounts to 600 euros (previously 400 euros) until December 30, 2011, then 500 euros.
3. The combination bonus for solar thermal plus heat pump or solar thermal plus biomass also amounts to 600 euros (previously 500 euros) until December 30, 2011, then 500 euros.
this might be of interest, but I have seen elsewhere that new subsidy rates for solar thermal systems have been in effect since the beginning of the week. In particular, the basic subsidy has been increased from 90 to 120 euros per square meter (m2).
From today until the end of the year, the following new MAP subsidy conditions apply for solar collectors and also for air collectors:
1. (Temporary) increase of the basic subsidy for solar collectors used for combined domestic hot water and space heating to 120 euros per square meter (m2) until December 30, 2011; after that date, the subsidy will return to 90 euros/m2.
2. The previously temporary boiler replacement bonus (bonus for replacing an old non-condensing boiler with a new condensing boiler) will be extended indefinitely but will be gradually reduced. The bonus amounts to 600 euros (previously 400 euros) until December 30, 2011, then 500 euros.
3. The combination bonus for solar thermal plus heat pump or solar thermal plus biomass also amounts to 600 euros (previously 500 euros) until December 30, 2011, then 500 euros.
Hello,
There is increased financial support available, which is great. If you are looking for funding, that’s all fine – but then you might as well tell grandma to cover the rest and move on to implementation. Oops, a red funding light – then just tell grandma she’ll have to pay for the support too. No craftsman is looking for such dreamers. So, wake up! 1. Efficiency/performance/technology matters, 2. economic viability – yes, you can still benefit from subsidies if they are available. Those who first ask about funding fall into this trap and will certainly find a few good salespeople – or do you not want a solar system just because your neighbor has one? If a technology is economically viable, it sells itself based on its benefits without subsidies. Please don’t misunderstand me – I’m not against financial support – but how, where, and when it makes sense should be approached sustainably. Sustainable is a German word that is often misused – similar to a “word of honor” – so that those fluent in German can no longer interpret it properly. So let’s go – build a solar system cheaply – there is funding.
Best regards
There is increased financial support available, which is great. If you are looking for funding, that’s all fine – but then you might as well tell grandma to cover the rest and move on to implementation. Oops, a red funding light – then just tell grandma she’ll have to pay for the support too. No craftsman is looking for such dreamers. So, wake up! 1. Efficiency/performance/technology matters, 2. economic viability – yes, you can still benefit from subsidies if they are available. Those who first ask about funding fall into this trap and will certainly find a few good salespeople – or do you not want a solar system just because your neighbor has one? If a technology is economically viable, it sells itself based on its benefits without subsidies. Please don’t misunderstand me – I’m not against financial support – but how, where, and when it makes sense should be approached sustainably. Sustainable is a German word that is often misused – similar to a “word of honor” – so that those fluent in German can no longer interpret it properly. So let’s go – build a solar system cheaply – there is funding.
Best regards
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