The Harlequin bunded oil tanks are engineered to exceed the most demanding requirements, including the relevant aspects of The Control of Pollution (Oil Storage) (England) Regulations 2001, The Water Environment (Oil Storage) (Scotland) Regulations 2006, British Standard BS5410, Pollution Prevention Guidelines PPG2 and comparable requirements throughout the United Kingdom.

A bund is a secondary containment area, a second skin around the original tank should the primary tank be damaged. For ease of installation every Harlequin bunded tank from Thermsaver, is supplied complete with electronic tank contents gauge, failsafe overfill prevention capability and a choice of top outlet, or bottom outlet with tank fitting kit.