Your own solar water heater

Is it worth it to upgrade a 50 gal gas hot water heater to a 75 gal for $450?

My spouse and I are building a new home. The standard hot water heater size is 50 gallons (gas). The builder gives the option to upgrade to a 75 gal for $450. I know that a HWH is a pretty permanent thing. The house is going to be about 2500 sq ft and for now it is just the two of us. (No kids yet). We both love long showers, and will probably have guests often. It is only a 4 br house, though, so we're not talking about hosting an army. Is it worth it to upgrade to the bigger hot water heater, and why or why not?

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