Just for point of reference, we heat for 2 weeks in December for the holiday break and it runs us about $375-$400. We decided it's worth it for us to enjoy with the family. It's all personal choice.
With 375,000# of water the best that heater can do is just under a 1*/hour temp rise. That will be if the air temp is higher than the water temp. Not sure of the air temps where you are but, any water temp above the ambient is going to loose heat rapidly. the loss will be faster the greater the temp difference
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