Three tanks of 1000 litres making a total system capacity of 3000 litre these tanks are narrow at only  590mm wide well suited to the boundary on many detached residential properties where space can be available at about a metre wide . Tank dimensions are on the rainharvestingpage of waterwhileaway.co.uk . Picture to the right shows the 1000 litre unit and pictures below show the three main sizes of tanks we supply . Choice of pump either a submersible or a surface pump connected to the brass insert in tanks .