So the bottom rusted out of our hot water heater and after the little woman stopped screaming a freind suggested instead of replacing our heater with another crappy standard unit to get one of them new on demand hot water heaters of course I had not idea what he was talking about but they turned out to be pretty cool, the only problem was which one? There were nortiz tankless water heater , takagi tankless water heater , or titan tankless water heater now the only problem was which one?