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Favorite Answer
The tanks are shaped in the best form to withstand pressure and prevent explosions. Round is strong.
redick
Round Propane Tank
Anonymous
Propane tanks are round because a sphere is the strongest shape possible for pressurized gas.
Anonymous
You need to make sure your heater is set up for propane first. Most pool heaters are set up for natural gas only, running propane in it would be dangerous.
Jennifer B
in addition to the best answers..stregnth
Making corners would involve more seams and bending, more points of stress.
They usually are around in peoples yards..you don't want to hit your shin on the corner of a propane tank as you mow the grass or other....