So you actually don't really need 50 gallons at 140F, just ~100 gallons around 100F or less. Maybe just use a heat exchanger for that as a "tankless" water heater. That fixes the bacteria growth issue and reduces the temperature requirement, increasing efficiency.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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