Yeah, I guess the biggest thing for us was we have a 6' long soaker tub. That thing would completely drain the 50 gallon tank, which is why the 60 gallon was necessary for us. I certainly wouldn't want to operate with just a 40 gallon. You'd have to time dishwasher, laundry, showers, baths, etc. If you have more capacity you never have to think about any of the above. Not that it would be a daily problem, but it'd be enough of a problem that it would bother me.
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