Direct open-loop tanks have three different dip tubes:
1. Cold Main Dip Tube
2. Solar Return Dip Tube
3. Solar Supply Dip Tube
The cold main dip tube goes all the way down to the bottom of the tank and allows cold water to flow to the bottom of the tank. The solar return dip tube is a shorter tube that is connected at the top of the tank. The solar supply dip tube is longer and allows for the water to be drawn by the pump up to draw from the cold water and take it up to the solar panels.