Why does ethanol have a higher boiling point than propanol?

It isn't; their boiling points are (ethanol) 78.4oC and (Propanol) 97.1oC. The boiling point of propanol is greater because it is the third member in the series (with 3 carbon atoms) and ethanol is the second (with 2 carbon atoms). While they have similar bonding characteristics, propanol is simply heavier.