Hello,
we are planning to build a detached house with about 200 sqm (2,150 sq ft) of living space.
The heating system will be a gas condensing boiler.
In the living and dining area, there will be a water-bearing stove.
And photovoltaic panels on the roof.
Our energy consultant said that if we want KfW 70 (a German energy efficiency standard), we need to install solar thermal panels on the roof instead of photovoltaic panels. But I would actually prefer not to do that.
Now to my question: Does solar thermal for hot water provide the same benefits as photovoltaic?
On the one hand for the KfW application,
and on the other hand from an energy perspective? And economically?
Thanks for your experience and input.
Best regards
we are planning to build a detached house with about 200 sqm (2,150 sq ft) of living space.
The heating system will be a gas condensing boiler.
In the living and dining area, there will be a water-bearing stove.
And photovoltaic panels on the roof.
Our energy consultant said that if we want KfW 70 (a German energy efficiency standard), we need to install solar thermal panels on the roof instead of photovoltaic panels. But I would actually prefer not to do that.
Now to my question: Does solar thermal for hot water provide the same benefits as photovoltaic?
On the one hand for the KfW application,
and on the other hand from an energy perspective? And economically?
Thanks for your experience and input.
Best regards
N
nordanney2 Jul 2015 13:02Photovoltaics are practically ineffective (this was also calculated by our energy consultant about two years ago) – but it is good for peace of mind to generate your own electricity.
Regarding your question, I can't contribute much myself. As far as I know, photovoltaic systems were almost completely ignored in the calculations for us as well.
In general—if you read through this forum—you will often find the opinion that solar thermal systems never really pay off. Whether that’s true, I don’t know. My father/my sister, who built around 2000, are quite satisfied with the savings on gas.
Contrary to the opinion expressed here, an article appeared last week on t-online praising solar thermal systems. The main point was: government incentives for photovoltaic have been greatly reduced, so it’s hardly worthwhile anymore. But with solar thermal, you can get hot water almost for free in spring, summer, and fall. Additionally, there is said to be a subsidy for solar thermal systems starting this year.
Appropriately, the author gave a top recommendation: the best option is to install both on the roof—photovoltaic and solar thermal.
Lastly:
There are also providers offering combined module types. These systems generate photovoltaic electricity while the heat produced at the modules is used to heat water. When I looked into this more intensively about 1.5–2 years ago, the overall setup wasn’t cost-effective. But prices may have changed since then.
In general—if you read through this forum—you will often find the opinion that solar thermal systems never really pay off. Whether that’s true, I don’t know. My father/my sister, who built around 2000, are quite satisfied with the savings on gas.
Contrary to the opinion expressed here, an article appeared last week on t-online praising solar thermal systems. The main point was: government incentives for photovoltaic have been greatly reduced, so it’s hardly worthwhile anymore. But with solar thermal, you can get hot water almost for free in spring, summer, and fall. Additionally, there is said to be a subsidy for solar thermal systems starting this year.
Appropriately, the author gave a top recommendation: the best option is to install both on the roof—photovoltaic and solar thermal.
Lastly:
There are also providers offering combined module types. These systems generate photovoltaic electricity while the heat produced at the modules is used to heat water. When I looked into this more intensively about 1.5–2 years ago, the overall setup wasn’t cost-effective. But prices may have changed since then.
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