Break tanks and mains water top-up

Clean water is of fundamental importance for human well-being. In many countries, public water supplies are therefore specially protected. The quality of water once it is drawn from the public supply system is no more defined. Therefore, it is necessary to ensure that water does not re-enter the mains network.


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WISY recommendations

For the separation of mains and service water

Sigura 9 break tank Sigura 9 break tank

Product information

Sigura 9 break tank

The SIGURA 9 break tank separates the points of use for service water from the public supply network. The mains water feed is designed as a free outlet in accordance with DIN EN 1717 and DIN 1988-100.

The SIGURA 9 break tank shall be installed in a frost-free utility room. It draws mains water and feeds it under pressure into the service water network. It supplies up to 4.5 bar pressure in the service water network and is also suitable as a pressure booster system for buildings with up to three storeys.

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InfoImportant details

Standardised separation from mains and service water supply network Complies with DIN EN 1717 and DIN 1988-100 Fully automatic function 35 l/min flow rate at 30 m delivery head Energy efficient

Product information

Sigura 350 break tank

The SIGURA 350 break tank separate domestic service water systems with a standard-compliant free outlet type AF from the public mains water and build up the required operating pressure. The intermediate tank holds 350 litres and serves as a buffer to quickly provide the required volume flow in the domestic service water system.

The pump is controlled by the Zeta 02 automatic switch and requires only 0.2 watts in standby mode. The pressure in the domestic service water system is generated either by the Multigo 205 (80 l/min) or 407 (120 l(min) submersible pump.

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InfoImportant details

Standardised separation from the mains and service water supply network Complies with DIN EN 1717 and DIN 1988-100 Optionally 80 or 120 l/min for large systems Energy efficient

Mains water top-up

Separate mains and service water


Sauberes Wasser ist für den Menschen unverzichtbar. Deshalb genießt die öffentliche Wasserversorgung in vielen Ländern einen besonderen Schutz. Die Qualität von Wasser, welches den Bereich der öffentlichen Versorgung einmal verlassen hat, ist nicht mehr kontrollierbar. Deshalb darf es aus nachgeschalteten Anlagen nicht zurück ins Leitungswassernetz gelangen.

Decalcify flower water

The safest way to prevent backflow is the free outlet. According to the standard, this is a "permanently unimpeded free flow path" for the water. It therefore falls freely downwards into an intermediate tank from which it cannot flow back.

A pump then builds up the required system pressure, which has dropped to ambient pressure through the free outlet. The volume of the intermediate tank, the type of pump and the pipe cross-sections are adapted to the desired pressure and volume ratio.

DIN EN 1717 AND DIN 1988-100

Throughout Europe, the requirements for the type of system separation are regulated by the EN 1717 standard. It has been adopted and supplemented for Germany by DIN EN 1717 and DIN 1988-100. Depending on the different qualities, categories are defined for liquids that can come into contact with mains water. The liquid categories are designated with the numbers 1 to 5. Category 1 corresponds to water for human consumption. Liquids with undefinable or unknown quality fall under category 5. Rainwater is water of Category 5 quality.

Separating devices according to standard

According to the quality category different devices for the connection of the water qualities are described. The devices are divided into types and designated with a combination of two letters.

Water category 5

According to the European standard, liquids of category 5 may only be used by means of free or open outlet of types AA, AB, AD, AF or, to a limited extent, type DC. The German standard gives concrete examples of apparatus whose liquid fall into this category. Examples of applications where a standard-compliant separation must be made are:

  • Tank filling, e.g. tank trucks
  • Sprinkler systems, underfloor systems
  • Fish tanks
  • Rainwater harvesting
  • Meat and fish processing machines
  • Galvanic plants
  • Glass rinsing equipment, e.g. at bar tables
  • Cooling circuits, cooling towers
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