We have a small solar thermal system on the roof. This was mandatory because we have a gas heating system (heating station with storage tank from the company Wolf). We wanted to finally find out how effective our system actually is. At first, we thought we were just not able to find the data on the display. After a lot of back and forth with the heating company, it turned out that our system does not have a heat meter. "The system only saves about 5% anyway. And we only installed it because it’s legally required," was the response. I’m quite surprised by this... This is the first time I’ve heard that. We paid a lot of money for it but have no way to verify what the system actually delivers. Is that common?
How is it for you? What kind of savings do your solar collectors provide? Can you read out your heat output?
Best regards,
Steffi33
How is it for you? What kind of savings do your solar collectors provide? Can you read out your heat output?
Best regards,
Steffi33
G
Goldi0911127 May 2018 13:36We have now also written off the solar system. €3,000 investment vs. €100 real savings per year
markus270328 May 2018 10:11You should not turn off your heating system, but to check if it is working properly, you can simply shut off the gas supply for a few days! If your heating system does not display any error messages, it means no attempt was made to heat the domestic hot water using gas.
With us, it is also easy to determine by the hot water temperature. With gas, it is about 53°C (127°F); once the solar system contributes heating, the water coming out of the tap is noticeably warmer.
With us, it is also easy to determine by the hot water temperature. With gas, it is about 53°C (127°F); once the solar system contributes heating, the water coming out of the tap is noticeably warmer.
Sorry… I’m only now finding time to check back here…
We have the Wolf CSZ-2R… Although the Wolf brochure advertises that you can clearly read the output of the system, our heating specialist and also our general contractor say that this is only possible with a significant extra cost and would also make the system more prone to faults. It all seems suspicious to me… On the phone, you get talked around until you’re confused and can’t keep track anymore…
We deliberately lowered the storage tank temperature to "dishwashing temperature." My husband believes that every time hot water is drawn (for example, in the evening or morning), reheating occurs and the burner switches on to make sure 300 liters (about 79 gallons) of hot water are available at the target temperature again. We don’t constantly need 300 liters of hot water in everyday life. I would actually prefer to turn off the gas boiler and see how far that gets us. Is it worth trying?
Kind regards,
Steffi
ypg schrieb:
Steffi, which Wolf system do you have?
We have one too, and every time I operate it, I’m also looking for that function.
We have the Wolf CSZ-2R… Although the Wolf brochure advertises that you can clearly read the output of the system, our heating specialist and also our general contractor say that this is only possible with a significant extra cost and would also make the system more prone to faults. It all seems suspicious to me… On the phone, you get talked around until you’re confused and can’t keep track anymore…
wrobel schrieb:
Suppressing the reheating should actually always be possible.
If necessary, lower the storage tank temperature significantly.
We deliberately lowered the storage tank temperature to "dishwashing temperature." My husband believes that every time hot water is drawn (for example, in the evening or morning), reheating occurs and the burner switches on to make sure 300 liters (about 79 gallons) of hot water are available at the target temperature again. We don’t constantly need 300 liters of hot water in everyday life. I would actually prefer to turn off the gas boiler and see how far that gets us. Is it worth trying?
Kind regards,
Steffi
markus270328 May 2018 20:34Keep the boiler running so that the control system stays active. Just turn off the gas valve.
S
Steffen8030 May 2018 08:46markus2703 schrieb:
Leave the boiler running so the control system continues to operate. Just turn off the gas valve.That’s not possible with Vaillant, for example. It causes an error and the system shuts down completely.
My solution: I connected a push button switch to the BURNER_OFF contact. In the summer, it stays closed, preventing any reheating. After consulting with Vaillant, this can be done "unofficially" this way 🙂
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