Solar yield is not readable

Ok, we have Viessmann and it is problem-free as long as the gas boiler does not need gas. Last year it worked fine for over 3 weeks until a cloudy period came. Then it wanted to heat with gas, and there was an error.

But of course it can be different with Vaillant.

Vaillant is unfortunately so stupid and practically wants to "reheat" every morning. Reason: the temperature for hot water in the buffer at the top should be 72 degrees... if you bathe/shower in the evening and shower in the morning, it naturally falls below 72, and then it wants to reheat. That is obviously completely stupid... because 40..45 degrees is more than enough for showering... hence the detour via BurnerOFF. This way, with a full buffer and no sun, we easily get through a week.

Correct Wrobel, however, with our system it is the case that on cold days you have to remember to activate it again yourself. Otherwise, the water will just stay cold.

Moin Moin

Suppressing the auxiliary heating in solar domestic hot water heating should usually be possible via the mode switch "Hot water off"


Olli

With Vaillant, there is only "Hot water off," which leads to a hot water setpoint of 0 degrees. Not very useful..

Hello again

I do think that it is "goal-oriented" this way, but everyone has a different goal. This solution certainly comes with a slight loss of comfort. The advantage is that I can see what my solar system is producing and avoid it competing with the heat generator. However, this can also be mitigated to be not quite as uncomfortable by adjusting the set temperature and the time window of the reheating.

Olli