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Being duel fuel They are ideal for storing solar energy
Also interesting, I'd never thought of that. I was planning to get a megaflow here for future onsen 2.0 fun but this is all the more reason, especially as there's some community solar panel project thing a few streets away which is eventually supposed to be coming to our street.
Are the tanks heated with an immersion or just use the combi and store it? Anyone got a link to the type of thing?