AquaHeat Arctic DP-520VK The AquaHeat heating unit of the Arctic DP-520VK type is specially designed for smaller networks and is equipped with a 100% priority switch on hot tap water. This contributes to the prevention of a too high simultaneity (network load) of the installation. This model has excellent performance. The basic functions of the Arctic DP-520VK are: Electronically controlled zone valve for the secondary installation The AquaHeat heat units are used in new construction and renovation projects, which are connected to a central heat distribution network per complex, block, or district. Some specific characteristics are: