Preftek offered VoluTek domestic hot water production units are developed and built with quality in mind. Top level accumulation tanks are built in AISI316L steel. Energy is provided via brazed plate heat exchanger and hydraulic module. For heat pump application DHW units could be delivered with 2 stage hot water production – at first stage acc. tanks are charged with lower temperature, while end tanks are equipped with electric heaters (alternatively additional coil from high temp. energy source). VoluTek DHW units feature customizable volumes (0,2m3 – 10m3) and layouts.