Are all heating oil tanks made the same?

No. First, make sure your tank is U.L. listed by looking for the label or plate with this information. Next, check to see how the tank was assembled. The tank ends on inexpensive tanks are typically welded to the body of the tank using a crimp connection instead of a lap joint.  Repeated filling of a tank can cause joint fatigue on a crimp connection and could cause a rupture.  We have responded to a number of oil spills where the welded joint split and the entire contents of the oil tank escaped. This is why we have chosen to install only Granby and Roth tanks because we know their products are time-tested and of high quality.