The VR / VRV range are replaceable membrane expansion tanks suitable for residential & light commercial use. The VR / VRV range of tanks are rated to 8 Bar pressure, feature a Galvanised Steel Flange, Rubber Membrane, and come with a 2yr Warranty. Available in sizes from 8 litres to 600 litres, with smaller sizes also available in the flat (pancake) version. (7, 8, 12lt only). Hydroheat have developed a fill kit for these tanks which incorporates automatic fill valve isolating valve, pressure relief valve and automatic air vent, all pre-assembled on a brass air separator.