The first factor is, how much water do you plan to use. A tank that is too small scause the pump to operate more frequently, using more energy. A larger tank causes the pump to run less frequently, but for a longer interval.
The size of well tank which is to be purchased would depend upon the factors of area of the house and how many members would use the water and what is the requirement total of the water intake and for how many days one would like to store the water.
First of all you should estimate the strength of place where you are going to place the tank. Size mainly depend upon the number of persons proposed to use it. The mouth of tank should be wide enough so as to easily clean. It should have tightfit lid.
