quote:
The GeoSpring HPWH is marketed and sold as having 50 gallon capacity but careful
measurements showed the unit in the lab held 45.5 gallons. National guidelines on the sizing of
equipment allow a 10% variation in nominal versus actual size. This water heater fits within
those guidelines albeit on the lower end. It should be noted that the difference in nominal size vs
actual size is not unique to HPWHs and occurs with traditional electric resistance tanks as well.
I did not know that my 50 gallon electric water heater might only be 45 gallons.