Im am doing a house with 4 showers, all with two heads a piece and one of them with seven heads plus a 72 x42 tub ect.... I need to size the hot water system to meet demand. I don't know if two 75 gal is enough. I thought about a hybrid system with a tankless inline but have never done it before. Rinnai reccommends 3 heaters and a 80 gal storage tank. Seems over kill especailly for a spec house, any ideas?
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Hot Water System