Roth Heating Oil Storage Tanks are corrosion resistant and are rust free inside and out, unlike many other steel oil tanks. Double Walled Roth Heating Oil Storage Tanks feature a weld-free galvanized steel outer tank layer that is capable of holding 110% of the primary tank. The inner poly tank is strong and durable. The primary inner tank is constructed of a seamless high-density polyethylene. This inner shell will not break down and will not contaminate heating oil. Each tank is equipped with a highly visible optical leak alarm. Roth Tanks are 55% lighter than a 12-gauge steel tank and they boast a larger storage capacity.