I assume you mean 30 gallon rather than 3 gallon.
Some thoughts:
- Taking into consideration the expectations of a potential buyer makes sense. You wouldn't want to lose a sale because of this choice.
- Cost may help you decide. A quick search turned up prices in the $500 range for 30 gallon but closer to $400 for 40 gallon.
- Whatever size you buy, you will still need the same amount of energy to heat the water. Using 20gals of hot water means heating 20gals of water again; it doesn't matter if that water goes into a 30 gallon tank or a 40 gallon tank.
- I suspect that the tanks are pretty efficient at holding water at a certain temperature so you wouldn't see much difference, if any, between the 30gal and 40gal tanks. (Note: Unless the 30gal is designed to save space and includes less insulation which would result in costing a little more to hold temperature)
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