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I’ll try to make this short. They put a 12-story building up right next to me. Since my chimney no longer vents as well because of the building, they are proposing to install a 30 Gal direct vent gas water heater. I live in a 2 family brownstone. Bottom floor is occupied by 1 person. Top 2 floors occupied by my 4 person family. Total 3 1/2 baths. Is 30 gallon enough? Master Plumber your input would be greatly appreciated. Thanks