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I have a 2,000 sq ft house, 4 bdr, 3 bath, 8 year old boiler, ends up being around 1,000 gallons/yr
In the summer, it's about 1 gallon/day to maintain hot water. In the winter can be tough, can average up to 7-9 gallons/day on really cold days, was closer to 6 this winter.