There are many variables to water use. How the owner programs the machine and which cycles are selected by end users will change consumption. The best we can do is provide an estimate based on a commonly used cycle.
For the HCs, we can give data for current Galaxy 400/600 controlled models, factory default normal warm cycle, 80 percent load. This data is gallons per cycle (not per hour). A cycle takes approximately 26 minutes. Daily water use will depend on cycles (or ‘turns’) per day.
20 lb = 20 gal
30 lb = 28 gal
40 lb = 34 gal
60 lb = 45 gal
80 lb = 63 gal
For the stack, there is a testing procedure dictated by the U.S. Department of Energy, J1 testing, which uses a defined load and calculates the averages. Based on this testing, the washer part of the stack washer and dryer uses an average of 13.9 gallons per cycle which takes approximately 30 to 44 minutes depending on the cycle selected.