Product Overview & Application Area
The pump group bundle DN25 with WITA 3-way mixer, Sunex manifold bar and fitting sets is intended for setting up mixed heating circuits in central heating systems. Depending on the selected variant, a single pump group or a complete setup for two or three heating circuits is provided.
The combination is suitable for radiator systems, underfloor heating and mixed systems where heating water is to be distributed to several independent circuits and controlled via mixed heating circuits.
Technology & Equipment
The pump group works with a WITA high-efficiency pump, a 3-way T-mixer with bypass and an actuator SM W05. Two centrally positioned ball valves with integrated thermometers support monitoring of flow and return. EPP insulation reduces heat losses in the area of the pump group.
In the variants for two or three heating circuits, the pump group is combined with a Sunex manifold bar. The manifold bar handles the hydraulic distribution of the heating water to the connected heating circuits and is designed for central heating systems with radiators, underfloor heating and mixed systems.
Everyday Benefits
The bundle combines the central components for setting up mixed heating circuits in a clearly plannable system configuration. The clear variant logic makes it easier to choose between a single pump group, pump group with fitting set, and two- or three-heating-circuit setup.
Thanks to thermometers, shut-off valves, mixing valve, actuator and manifold bar, the heating circuit distribution remains easily controllable and accessible for maintenance.
System Integration & Compatibility
The pump group is suitable for mixed heating circuits with supply line on the left or right. The Sunex manifold bar enables distribution to two or three independent circuits. The fitting sets support the proper connection of the pump group in the hydraulic setup.
The specific integration must match the existing heating system, the control system, the required heating output, and the hydraulic design. The hydraulic balance and the electrical control of the pump and actuator must be considered on the system side.
Technical data at a glance
| Product family |
Heating accessories & system technology |
| Product type |
Pump technology |
| System technology detail |
Pump group |
| DN / Nominal width of pump group |
DN25 |
| Pump group connection |
Top connection 1" female thread, bottom connection 1 1/2" male thread, pump length 180 mm, R 6/4" male thread |
| Kvs value of pump group |
6.0 m³/h |
| Max. operating pressure |
6 bar |
| Max. operating temperature |
110 °C |
| Temperature display |
0-120 °C |
| Materials |
Steel, brass, EPP insulation, sealing material PTFE / EPDM |
Installation
Installation is carried out in the heating system on a load-bearing, easily accessible surface. The manifold bar is mounted without stress, then the pump groups and fitting sets are installed according to the heating circuit plan. Flow, return, flow direction, and electrical control must be checked before commissioning.
Notes
The selection of the appropriate variant depends on the number of heating circuits, the system hydraulics, the control, and the required heating output. Installation, electrical connection, commissioning, and hydraulic balancing must be carried out by a qualified professional.
Scope of delivery
- Variant pump group individually: 1 pump group DN25 with 3-way mixer, actuator, and WITA high-efficiency pump
- Variant pump group with fitting set: 1 pump group DN25 and 1 fitting set including gaskets
- Variant 2 heating circuits: 1 Sunex manifold bar 2-way, 2 pump groups DN25 and 2 fitting sets
- Variant 3 heating circuits: 1 Sunex manifold bar 3-way, 3 pump groups DN25 and 3 fitting sets