The Grant Vortex Pro outdoor sealed system kit external modules can be converted to sealed system operation by purchasing a pre-assembled kit from Grant. This includes an expansion vessel, an automatic air vent, a pressure relief valve, and a circulating pump. A filling loop and pressure gauge are also supplied as part of the kit. These can be fitted within the module casing or, ideally, on a convenient site within the building, located between the cold main and the central heating return.

Brand Name	Grant