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
markus270330 May 2018 10:54Ok, we have Viessmann and it works seamlessly as long as the gas boiler does not require gas. Last year, it worked well for over three weeks until a cloudy period occurred. Then it wanted to heat with gas, and there was an error.
But of course, it might be different with Vaillant.
But of course, it might be different with Vaillant.
S
Steffen8030 May 2018 11:25Unfortunately, Vaillant is quite annoying and wants to "reheat" almost every morning. The reason: the target temperature for the hot water buffer at the top is set to 72°C (162°F)… so if people bathe or shower in the evening and then shower again in the morning, the temperature naturally drops below 72, and then the system wants to reheat. This is obviously quite unnecessary, because 40–45°C (104–113°F) is more than enough for showering. That’s why we use the workaround with BurnerOFF. This way, with a fully charged buffer and no sunlight, we can easily manage for a week.
markus270331 May 2018 11:25Correct, wrobel, however, with our system, you need to remember to reactivate it on cold days. Otherwise, the water will just stay cold.
S
Steffen8031 May 2018 14:31wrobel schrieb:
Good morning
Suppressing the reheating in a solar domestic hot water system should generally be possible using the mode selector switch set to "Hot Water Off".
OlliWith Vaillant, there is only the option "Hot Water Off," which sets the hot water target temperature to 0°C (32°F). Not very practical..
Hello again
I do think this approach is "effective," but everyone has different goals. This solution likely comes with some minor loss of comfort. The advantage is that I can see how much my solar system is producing and avoid having it compete with the heat generator. However, this can also be moderated to be less uncomfortable by adjusting the target temperature and the time window for the reheating phase.
Olli
I do think this approach is "effective," but everyone has different goals. This solution likely comes with some minor loss of comfort. The advantage is that I can see how much my solar system is producing and avoid having it compete with the heat generator. However, this can also be moderated to be less uncomfortable by adjusting the target temperature and the time window for the reheating phase.
Olli
Similar topics