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To all who can offer good suggestions, I have a four story 3-family brownstone with 4 bathrooms, clothes washer& dishwasher. Recently is seems like all 6 adults are taking a shower at the same time in the morning which created a problem with hot water running low or turning cold. We have an older A.O. Smith 50 gallon, 40000 BTU per hour, which gives only 40 gal per hour of hot water. Obviously we need a better heater. The question is what size should we get, stay with 50 or go to 75 gallon. I do not want to make a mistake of getting new one which would not be sufficient. Also if we change the heater does the plumber has to file and/or obtain plumbing repair slip for this work? Master Plumber – help!