Inertial storage of heating water with temperature stratification and a corrugated stainless steel exchanger, for domestic hot water production. Models: A.I.C.S. / S1 (inertial storage combined with a stratification device, with an integral stainless steel exchanger for domestic hot water production + 1 integral coil exchanger for the solar power system). A.I.C.S. / S2 (inertial storage combined with a stratification device, with an integral stainless steel exchanger for domestic hot water production + 2 integral coil exchangers for the solar power system). These steel tanks are ideal for storing large quantities of energy, in the form of hot water, generated principally using renewable sources. They can be used in support of systems based on gas or gasoil boilers, wood burners, heat pumps, solar installations and other sources of renewable energy. The integral temperature stratification device allows the water to be drawn off at the desired temperature; it is particularly suited to heating systems operating at low temperatures (radiant floor panels). Domestic hot water can be delivered immediately via the incorporated exchanger, comprising a special corrugated flexible hose made of stainless steel of ample surface area and cross-section.