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I... Genuinely only realizing this now
(lemmy.world)
People tweeting stuff. We allow tweets from anyone.
RULES:
It’s typically used for large complexes like campuses where the hot water is made en masse in one building and the loop goes around all the other buildings. Helps keep cost down (at construction) because you only need one giant water heater. Helps not have to wait 10 minutes to bring the hot water to your building. Energy still gets wasted but given the number of users, not that bad.