Hey to all you NL people (we're in Den Haag) - I've been researching solar water heaters and they look really promising? I've read they even work in winter. Is that wishful thinking in a country like NL?
If there’s no sun you’re looking at a different energy source which typically means electricity so you’re back to the demand problem when the weather is poor regarding renewable power.
I can't really comment except that when I asked our installers about it they had the perception that solar water heating was "an 80's and 90's thing". I don't know much about it beyond that.
I guess you could look up the insolation values and do the math on how much water you use and how hot it needs to be.
If there’s no sun you’re looking at a different energy source which typically means electricity so you’re back to the demand problem when the weather is poor regarding renewable power.