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want to install a domestic hot water system in a kitchen\laundry can't decide how to do it 4 on demand water heaters would do the job with a 119 gal storage tank water is very corrosive can't help but think that neither is going to last the way that you have to recirculate through the on demand water heaters and the tank will last for about 3 to 4 years also have 2 unit heaters in there 36000 btu each