WATER-PRO: is a line of compact expansion tanks for sanitary hot water with a fixed potable water butyl membrane and internal epoxy coating.  These tanks are provided with a stainless steel fitting.  MIG welding eliminates any sharp cutting edges inside the tank.  The shape of the membrane is designed to avoid any water stagnation and therefore the growth of any bacteria. The stainless steel fitting makes this tank particularly suited for boilers. WATER-PRO can be used in pump systems and as anti-water hammer. Sizes range from 5 to 24 liters (1 to 5.3 UK Gallons). WATER-PRO is certified according to PED 2014/68/EU, WRAS, ACS, IAPMO, and NSF.