coil #1 coil #2 coil #3 coil #4 entering-water temperature, F 42 42 42 42 leaving-water temperature, F 57 57 57 57 water ΔT, F 15 15 15 15 tube diameter, in. 3/8 1/2 1/2 5/8 coil rows 6 6 6 6 fin density, fins/ft 114 159 124 133 fin design high capacity high