The Solar external expansion vessel stainless steel unvented cylinder has the pressure expansion vessel fitted on the pipe work by the cylinder which takes up a bit more space. It still gives you the same megaflow performance of high pressure hot water when used in conjunction with a heat source and attached to the mains pressure cold water to give mains presure showering and fast filling bath, with the added benefit of lower running costs(can be as much as 60% less than traditional systems).

Desigened for use with a wide range of solar systems they are enviromentally friendly and an efficient way of providing domestic hot water by using specificly designed coils in the base of the cylinder which gives maximum heat input and efficiency from the solar energy. They are available in different versions Thermsaver Solar Vertical, horizontal, single/twin coil, ACV Smartline and Smartline Multi Energy.