Bunded oil tanks are by far the best oil tank to have; this is because the tank has an inner and an outer tank. The oil is stored in the inner tanks and the outer tank is to protect any leaks from spilling out on the floor. Most environmental agencies require you to have a bunded oil tank.
A Bunded Oil Tank is a tank within a tank. The area surrounding the inner tank is called the bund. These types of oil storage tank are ideal for safley store domestic heating oil.
Bunded oil tanks are used nearly everywhere now as they are the safest form of storage. You will need to use a bunded oil tank if you are storing oil within 10 meters a drain, water course or place of natural beauty. Most insurance companies require you to have a bunded oil tank apposed to a single skin tank. Some locations in the UK the environmental agency may also ask you to install a Bunded Oil Tank.