The use of stainless steel and of the membrane which is suitable even for alimentary purposes as for cold water or hot water with temperatures up to 70°C, are the main features of this range of expansion vessels.
The whole range of stainless steel expansion vessels we produce is equipped with an absolutely non-toxic membrane suitable for the contact with drinking water according to the the British WRAS.
When the pump starts, water enters the membrane tank as system pressure passes the pressure precharge using the whole capacity of the tank. Only usable water is stored. When the pressure in the chamber reaches the maximum system pressure, the pump stops working.
The tank is filled to its maximum capacity. When water will be needed again, pressure in the air side will push water into the system. Since the Zilmet INOX ULTRA-PRO tank does not water log and delivers all possible water, minimum pump starts are assured with saving on energy consumption.