General pressureless solar energy relies on natural gravity to discharge water, that is, the solar energy is at a high place, the water point is at a low place and the water outlet hole on the solar is open at the bottom of the bucket or the lower part of the side; if it is a pressure type, the water inlet is generally at the bottom and the water outlet is at the top. Only when pressurized water enters can water enter. the water tank is pushed outwards.
If you are making a simple water tower for cold water, you just need to open a water inlet hole on the upper part of one side of the water tank, to add a float valve inside, then install at the bottom or below (preferably on the side) 2-3 cm from the bottom) to open a water outlet and install a maintenance valve. If the water tank you are building is going to hold hot water, it is best if the inletWater goes directly to the bottom of the water tank and the water outlet is open at the bottom side with a solar hot dog inside to make sure the hottest water can be used.