In The Morning The Hot Water Heater Only Has Enough Hot Water For One Shower If You Don't Wait At Least 30 Minutes. Two Of My Daughters Take Showers At Night Before Bed. My Wife And Other Daughter Take A Shower In Morning. At Night It Seems To Work Better Than Morning. The House Was Bought New About 6 Years Ago. The Water Heater In Under House And Is About 30 To 40 Gal Size. What Do You Think Problem Is?