water heater sizing
I am doing a complete house remodel and I want to put in the proper size hot water heater. There are two of us living in the house. The energy source is natural gas. The largest use will be a 78 gallon whirlpool tub. The plumber has suggested a 65 gallon heater for filling the tub. This makes sense on the surface, but in all actuality, the tub will be used infrequently after the newness wears off. My concern is the standby energy cost of such a large water heater. Can I use a 50 gallon heater with the temperature set way high and add a tempering valve set at 120?
Will the standby energy use be less with this set up, equal or more?