Plastic Single Skin Oil Tank are available in sizes from 650 litres up to 20,000 litres. The domestic single skin heating oil/kerosene tanks are allowed to be fitted in England as long as OFTEC guidelines are followed. We have plastic Single Skin oil tanks from Carbery, Atlantis and Tuffa Tanks. . The large commercial single skin oil tanks up to 20,000 will need to have an additional bund created when installed to be compliant with regulations.