Clear separation between domestic water and storage tank water 

The ROTEX Sanicube is a combination of hot water storage tank and a water heater system. The actual heat is not stored in the domestic water but in the clearly separate storage water. The domestic water content is relatively low at 19 to 80 l, depending on the storage tank type. The total storage tank capacity is 300 to 500 l, however. The heat volume which can be stored and extracted is correspondingly large.

Heat storage tank and flow heater

The storage tank water is filled once during commissioning and is only used for heat storage. It is neither replaced nor consumed. The storage tank itself consists entirely of plastic, the inner and outer wall is made of impact resistant polypropylene (PP), the space in between is insulated with heat-conserving foam. This produces excellent heat insulation values and keeps surface losses to a minimum. The heating of the storage tank water and the charging of the storage tank can be carried out in various ways:

• With heating water (oil, gas, solid fuel boiler, heat pump or utility-supplied heat) via a stainless steel heat exchanger.
• With solar energy, direct heating of the storage tank water via the ROTEX Solaris System.
• With an electric heating element (optionally 2 or 2-6 kW).

The hot water (domestic water) is heated in a pipe register heat exchanger made of stainless steel, which is immersed in the storage tank water.

The anti-legionella storage tank

The structure of the ROTEX Sanicube ensures that it has optimum inherent water-hygienic properties since water to be heated is ducted and heated through a stainless steel corrugated tube heat exchanger system.

Low flow sections or sections that are not heated properly on the hot water side are completely eliminated using the ROTEX Sanicube. The Domestic hot water is entirely contained in a piping system so that deposists such as sediment, rust or other deposits which can arise in large volume tanks are not produced. Water that is charged first is also the first to be removed (first-in-first-out principle) The Water hygiene advantages of the ROTEX Sanicube are thus considerable.

The outstanding water-hygienic advantages have been confirmed by an extensive test undertaken by the Hygiene Institute at the University of Tubingen.