HERZ Pumpfix Compact
Fewer interfaces - more system

In the day-to-day work of plumbers, a pattern repeats itself: heating and cooling systems are becoming increasingly technically sophisticated, whilst at the same time the demands on space, time and precision on site are rising. Every system consists of standard hydraulic functions – yet the traditional method of installing these components individually takes time, takes up space and increases the likelihood of mistakes. This is precisely where the new HERZ PUMPFIX Compact comes in. It combines two fully pre-assembled and independent pump groups into a compact connection solution, thereby reducing the most time-consuming steps in the installation process: the assembly, calibration and fitting of individual hydraulic components on site.

An often underestimated factor in heating and cooling technology is not only the subsequent energy efficiency, but also the efficiency of the installation process itself. Every hour saved during installation not only reduces costs but also minimises complexity on site.

In conventional systems, the hydraulic distribution consists of many individual components, each of which fulfils an important function. However, it is only the interaction between these components that makes the system operational. It is precisely this interaction that is established factory-side in the HERZ PUMPFIX Compact.

The HERZ PUMPFIX Compact is integrated into the circuit between the heat generator and the heating or cooling circuits.

All central components – such as the manifold, shut-off valves with thermometers in the flow and return lines, check valves and high-efficiency pumps – are integrated into a thermally insulated pump unit and coordinated with one another.

Acting as a hydraulic interface, this pump unit supplies the individual functional areas and ensures that water circulates reliably at the correct temperatures. In practice, this shifts the focus to what really matters – away from the installation of individual components and towards functional system integration.

Day-to-day operational requirements

The key feature of the HERZ PUMPFIX Compact is the combination of two independently operating pump groups in a single unit. Depending on requirements, these can be configured as two mixing circuits, two direct circuits or a combination of both. This flexibility is particularly crucial, as systems rarely have uniform usage requirements. Part of the system often requires a controlled flow temperature, for example for underfloor heating or combined heating and cooling systems. In such cases, the mixing circuit comes into play, continuously adjusting the fluid temperature via a three-way valve and an external controller. The defined flow temperature is achieved by the controlled mixing of cool return water into hot flow water.

In parallel, a second circuit can be designed as a direct circuit, which operates without temperature mixing and transfers the heating water directly from the heat generator to the consumer. Typical applications include conventional radiator circuits or boiler charging.

Combining both principles in a single unit enables a clear separation of different hydraulic requirements within a system.

Two pump units, a wide range of applications

A combination of different pump groups is possible for HERZ PUMPFIX Compact in the following scenarios:

For two mixing circuits:

Two PUMPFIX Mix pump units are used for this purpose. These are designed for systems where active temperature control is required. They operate with a mixing motor and enable precise adjustment of the flow temperature via a 3-point control system. They ensure stable and energy-efficient operating conditions, particularly in underfloor heating systems or combined heating and cooling systems.

For two direct circuits:

Two PUMPFIX Direct pump units are in use. These establish a direct connection between the heat generator and the heating circuit. Thanks to the shut-off valve acting as a connection component, the pump can also be replaced with ease.

For the combination of a mixed circuit and a direct circuit:

For applications requiring both a controlled mixing circuit and a directly supplied heating circuit, the HERZ PUMPFIX Compact is designed as a combination of a PUMPFIX Mix and a PUMPFIX Direct pump unit.

Can be flexibly adapted, even in the event of subsequent changes

In all variants, the pump groups in the HERZ PUMPFIX Compact are connected to one another via a common manifold. Depending on the system requirements, the manifold can be used either as a pressurised manifold or as a hydraulic separator. This adaptability allows for flexible integration into various heating systems and facilitates the hydraulic balancing of the entire system.

The function of the hydraulic separator is particularly required in systems with an additional supply pump in the primary heating circuit. It ensures hydraulic decoupling between the flow and return pipes and balances out differences in flow rates between the primary and secondary circuits. As a result, each circuit operates independently within its optimal operating range, whilst at the same time improving the stability and controllability of the entire system.

This modularity is particularly important in an environment where requirements often change during the construction phase or later in operation. Instead of rebuilding the entire system from scratch, the existing structure can be expanded or adapted without losing the basic hydraulic architecture.

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