Engineering the circulation for modern stratified hygienic storage tanks can be quite a challenge. For example, the service water connections to the water heaters are frequently inefficient or incorrect or important parts are simply "forgotten". In many cases, the circulation line of stratified storage tanks is connected to the cold water inlet of the drinking water heater so that hot water gets into the cooler area of the stratified storage tank - only to be heated up again in the upper thermal layers. The consequence: The storage medium is evenly heated which destroys the important thermal layering. The energy density in the upper thermal layers is lost - in the most adverse case, the function of a solar system is prevented or extremely limited in the transition period.

The new AFRISO WZS 100 hot water circulation system was designed for easy connection and integration of modern stratified storage tanks. The system ensures intelligent circulation distribution without back-circulation and without mixing of the temperatures in the stratified storage tank. With minimum effort, all possibilities of stratified storage systems for highly efficient heating of water can used to their full potential. (Photograph: AFRISO)

The new AFRISO WZS 100 hot water circulation system was designed for easy connection and integration of modern stratified storage tanks (solar, hot water, hygienic or combination storage tanks) with internal or external circulation. The compact assembly consists of a thermostatic mixing valve with scald protection, a circulation pump as well as all functional components such as shut-off valves, variable safety group assembly, backflow preventers and connection parts as per DIN 1988.

The hydraulic separation of the flow paths ensures correct operation of the circulation pump since it has to overcome only one backflow preventer in any operating condition and thus reliably avoids mixing of the cold water inlet in the circulation path. The system WZS 100 is suitable for temperatures of the medium of up to 95 °C and a system pressure of up to 10 bar at a flow of 1.6 m³/h. An integrated adjustable and sealable mixing valve (35 °C to 60 °C) helps to avoid scalding at the taps. The new hydraulic assembly WZS 100 provides for professional implementation of a service water circulation connection to an energy storage tank (hot water tank/stratified storage tank) which is operated at temperatures higher than 60 °C either permanently or temporarily.

The hydraulic assembly is suitable for stratified hygienic storage tanks and bivalent service water tanks and can also be used in existing systems (for example, hot water tanks with wood-, gas- or oil-fired boiler). In such cases, controlled circulation to meet actual demands also results in high energy savings. The new hot water circulation system is primarily geared towards single-family and two-family houses and is generally suitable in conjunction with renewable energies in building technology.

Weitere News

16 Apr 2025

AFRISO supports the HVAC industry

Homeowners are investigating into future-proof, sustainable heating technologies – in particular, a conversion to heat pump systems.

16 Apr 2025

AFRISO zone manifold HSM

On the occasion of the ISH 2025 fair, AFRISO presented the HSM zone manifold (patent pending), an innovative, modular system solution that can be flexibly expanded and customised for virtually any requirement

16 Apr 2025

Clean performance of heat pumps

Solid impurities and magnetite can adversely affect and damage the system components of a heat pump system.

13 Mar 2025

Zone valve AZV from AFRISO

Easy to retrofit, just as simple to use: The new AZV zone valve from AFRISO lets you switch between different operating modes for heat pumps or toggle between heating systems in hybrid systems – which are likely to become increasingly important in the future.

13 Mar 2025

AMB 900: Heat pump installation the easy way

Why do it the hard way? The new monobloc indoor module AMB 900 from AFRISO supports heating system experts in the installation of monobloc heat pump heating systems.

13 Mar 2025

Frost protection valves AAV 102/302 from AFRISO

Technical defect or a power outage: If the circulation of monobloc or hydrosplit heat pumps fails at low outside temperatures, there is a risk of frost damage to the heat exchanger, the pump or the valves – with considerable consequential costs.

Maßgeschneiderte Lösung für Wärmepumpenanwendungen: Das Frostschutzventil AAV und das montagefertige Innenmodul erleichtern die Installation.

22 Jan 2025

AFRISO at the ISH 2025

Technology-openness will take centre stage with the AFRISO exhibits at the ISH trade fair in Frankfurt am Main (March 17 to 21, 2025).

21 Jun 2024

Liquids and leaks cannot go unnoticed

Automatically detecting accumulations of liquids resulting from leaks, backwater or flooding and triggering an alarm if the worst comes to the worst: The new AFA 11 liquid detector from AFRISO meets these requirements in a vast array of applications.

21 Jun 2024

Red Dot Award for EUROLYZER® S1

EUROLYZER^® S1, AGRISO's all-in-one measuring instrument, has won the renowned Red Dot Award 2024 Product Design. The jury has now announced its decision. The design, functionality and quality were convincing across the board.

20 Jun 2024

Visualising and logging data in an easy way

The new multi-channel process display MPA 10 makes it easy to keep an eye on important data at all times. The device for control panel mounting not only displays a wide range of configurable values on its colour display, but also serves as a flexible data logger.

12 May 2023

EUROLYZER® S1 takes flue gas analysis to a new level

The number of measuring and servicing tasks in the HVAC business is on the rise. Therefore, solutions are needed that ensure precise measurement results and easy handling in everyday work, and, at the same time, make processes more efficient thanks to digitalisation.