ROTEX Sanicube - The hygienic hot water storage tank

The ROTEX Sanicube is a corrosion-free plastic hot water storage tank with a stainless steel corrugated pipe heat exchanger. It is a combination of hot water storage tank and flow water heater system with properties which are particularly water hygienic.
Available in two different sizes, it is suited to almost every application.

ROTEX Sanicube - The high-performance hot water storage tank

Optimum water hygiene
High comfort
Ideal for solar energy use

Part of the quality of life

Hot and fresh water is indispensable for all households. Whether for showering, bathing, cooking or washing your hands. Having the desired quantity of hot water at the right temperature forms a significant part of the modern way of life.

As such, we have placed particular emphasis on water hygiene. The ROTEX Sanicube has been designed to comply with the latest requirements in the heating and water hygiene industries. Its structure is fundamentally different from conventional large-volume hot water storage tanks used up until now. The ROTEX Sanicube combines the advantages of a water heater system with those of a heat storage tank. As a result of its structural design, it supplies hot water of perfect quality at all times.

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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.

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Water hygiene is our principle

As a result of its structure, the ROTEX Sanicube is optimum from a water hygiene perspective, since the water to be heated is passed through to a pipe system and is heated. The water content of the domestic water heat exchanger is currently 19/24 litres and is therefore only a fraction of the water quantities usually found in storage tanks. Areas with little current or which are not heated all the way through on the hot water side do not even come into question in the ROTEX Sanicube.

Domestic water is exclusively located in one pipe so that deposits of sludge, rust or other sediments, as can occur in containers with a large volume, are not possible. The water stored first is also taken out first (First-in-first-out principle).

The outstanding water hygiene advantages of this type of hot water storage tank were confirmed by extensive research carried out by the hygiene institute of Tübingen university.

Keyword legionella

Legionella bacteria

There are approx. 35 types of legionella. At least 17 of these are pathogenic. The most common consequences are: Pontiac fever: symptoms similar to flu which improve after a few days. Legionnaire's disease: severe bacterial lung infection. The infection is fatal in 15 to 20 percent of cases.

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ROTEX Sanicube Solaris - Solar energy for hot water and heating

In conjunction with the unpressurised
ROTEX Solaris solar system, free energy from the sun is used highly effectively:

for water heating
for heating support
with low heat losses
minimum maintenance costs
for perfect water hygiene
and practically limitless hot water comfort

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The ideal solution for all large systems

The issue of water hygiene is of particular relevance in the case of buildings with a large hot water demand. In hotels, hospitals, sports halls and homes for the elderly, the supply of hot water is extremely important. There are clear legal requirements pursuant to the German domestic water Ordinance (Trinkw.V 2000).

The ROTEX Sanicube hot water storage tank optimally meets the most demanding water hygiene requirements, since its operates like a flow water heater with regard to domestic water. Where there is a demand for large volumes of hot water, several ROTEX Sanicubes are simply connected to each other like modules. This has the advantage that the available space can be used in various ways. With the appropriate control technology equipment, it is also possible to install decentralised hot water storage tank systems in large supply networks.

Thanks to its light weight and its favourable dimensions, the Sanicube hot water storage tank is easy to transport and can be easily incorporated into existing buildings. In this case, large hot water storage tank systems can be connected to each other.

The variable storage tank system

The ROTEX Sanicube enables a very wide range of system variants. It is possible to meet the most complex demands with the different heat exchanger designs in the ROTEX Sanicube range. As a result, several heat sources can be integrated to produce additional heat extraction for a swimming pool or similar. In these cases, the whole systems usually remain relatively simple and clearly arranged and the control technology costs are generally low.

In the event of a subsequent change in the performance requirements, the system can often be modified very easily and flexibly without having to increase or decrease the number of Sanicubes owing to the modular layout.

Possible fields of application

The calculation of the required number of Sanicube storage tanks and the corresponding total heating output depends on the required maximum withdrawal quantity (withdrawal per unit of time) and on the withdrawal profile based on the dimensioning. Inside large widely dispersed buildings, it can also often be worthwhile to distribute several Sanicube storage tanks decentralised outside the building and to install them as close as possible to the consumers, thereby minimising heat losses and saving on pumps and expensive pipelines.

Hotels or hospitals often require large volumes of hot water instantly. The volume of heat stored in the ROTEX Sanicube is so large that a momentary increase in demand can be covered, even if the recharging output of the heat generator is comparatively small.

Short-term hot water output for each Sanicube unit therefore does not depend on the output of the heat generator to any great extent. If several Sanicube storage tanks are connected to each other in a large system, the outputs of the individual storage tanks are added to each other.

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Sanicube Solaris INOX		SCS 328/14/0	SCS 538/16/0	SCS 538/16/16

Basic data
Total storage capacity	Litres	300	500
Empty weight	kg	55	87	93
Total filled weight	kg	335	587	593
Dimensions LxBxH	cm	59,5x61,5x159	79x79x159
Max. permissible storage tank water temperature	°C	85
Standby heat consumption at 60 °C	kWh/24h	1.4	1.3	1.4
Domestic hot water
Domestic hot water exchanger volume	Litres	19	24.5
Max. operating pressure	bar	10
Domestic hot water heat exchanger material		stainless steel
Domestic hot water heat exchanger surface	m²	4.1	5.5
Average specific heat capacity	W/K	1820	2470
Storage tank charging heat exchanger (stainless steel)
Water content heat exchanger	Litres	10	10.4
Surface area charging heat exchanger	m²	2.1	2.3
Average specific heat capacity	W/K	910	1040
Tank primary heat exchanger 2 (stainless steel)
Water content heat exchanger	Litres	-	-	10.4
Surface area charging heat exchanger	m²	-	-	2.3
Average specific heat capacity	W/K	-	-	1040
Solar heating support (stainless steel)
Water content heat exchanger	Litres	-	2
Heat exchanger surface area	m²	-	0.43
Average specific heat capacity	W/K	-	200
Thermal output data
Output characteristics N_L in accordance to DIN 4708 ¹⁾		2.2	2.3	2.5
Continuous output Q_D according to DIN 4708	kW	27	35	45
Max. draw-off rate for 10 min. with 35 kW bei (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	l/min	21	22	24
Hot water quantity without reheating with a draw-off rate of 15 l/min (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	Litres	200	220
Hot water volume with reheating at a power rating of 20 kW and a draw-off rate of 15 l/min (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	Litres	400	442	453
Short-term water quantity in 10 min	Litres	210	220	240
Pipe connections
Cold and hot water	inch	1" AG
Heating inflow and return flow	inch	1" AG
1) Loading with 35 kW, 80 °C feed temperature, 65 °C storage tank temperature 45 °C hot water temperature and 10 °C cold water temperature

Sanicube Solaris INOX		SCS 538/0/0	SC 538/16/0	SC 538/16/16

Basic data
Total storage capacity	Litres	500
Empty weight	kg	81	84	90
Total filled weight	kg	581	584	590
Dimensions LxBxH	cm	59,5x61,5x159
Max. permissible storage tank water temperature	°C	85
Standby heat consumption at 60 °C	kWh/24h	1.4
Domestic hot water
Domestic hot water exchanger volume	Litres	24.5
Max. operatring pressure	bar	10
Domestic hot water heat exchanger material		stainless steel
Domestic hot water heat exchanger surface	m²	5.5
Average specific heat capacity	W/K	2470
Storage tank charging heat exchanger (stainles steel)
Water content heat exchanger	Litres	-	10.4
Surface area charging heat exchanger	m²	-	2.3
Average specific heat capacity	W/K	-	1040
Speicherlade-Wärmetauscher 2 (Edelstahl)
Water content heat exchanger	Litres	-	-	10.4
Surface area charging heat exchanger	m²	-	-	2.3
Average specific heat capacity	W/K	-	-	1040
Solar heating support (stainless steel)
Water content heat exchanger	Litres	2	-	-
Heat exchanger surface area	m²	0.43	-
Average specific heat capacity	W/K	200	-	-
Thermal output data
Output characteristics N_L in accordance to DIN 4708 ¹⁾		2.3	4.1	4.4
Continuous output Q_D according to DIN 4708	kW	35		50
Max. draw-off rate for 10 min. with 35 kW bei (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	l/min	22	30	31
Hot water quantity without reheating with a draw-off rate of 15 l/min (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	Litres	220	412
Hot water volume with reheating at a power rating of 20 kW and a draw-off rate of 15 l/min (T_KW = 10 °C/T_WW = 40 °C/T_SP = 60 °C)	Litres	442	837	843
Short-term water quantity in 10 min	Litres	220	300	310
Pipe connections
Cold and hot water	Inch	1" AG
Heating inflow and return flow	Inch	1" AG
1) Loading with 35 kW, 80 °C feed temperature, 65 °C storage tank temperature 45 °C hot water temperature and 10 °C cold water temperature

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