My girlfriend lives with me and my family. Whenever she takes a shower, there just doesn’t seem to be enough hot water. She usually showers early in the morning. Nobody showers before her. However, whenever I, or any of my family members shower, we don’t have this problem. Could it be because she has the hot valve completely cranked and it doesn’t give the hot water tank enough time to heat up more water? Or is it a problem with the hot water tank? I think the tank is 60 or 40 gallons.