One circle secondary electronic heating system

One circle secondary electronic heating system

Heating pump units for radiator and floor heating - Electronic (servomotor) mixing valve

Content of package:

  • Heating pump unit with servomotor mixing valve (built-in by-pass)
  • Euroster 11M controller

Pump unit with electronic mixing valve



Heating circuit supplier pump unit

  • Space-saving, compact design
  • Insulated, aesthetic
  • Quick and easy assembling
  • Mechanic friend therefore is more economical to build up
  • Plannable mechanic costs
  • Adjustable heating water temperature per heating circuit
  • Reasonable price/value rate
  • Long lifetime for the best quality components



Pump unit with servomotor mixing valve 3/4”

DN20 pump units can be connected to heating systems with powers up to 33kW, with a very
low energy consumption assured by high efficiency synchronous circulating pumps.


EPP insulation box (Measurements: 180x302x142 mm).
Centre distance 90 mm.
Especially suitable to manage medium-low powers in small rooms,
thanks to its centre distance of only 90 mm.
For power up to 33 kW (with Δt 15 K).
Maximum flow 1900 l/h.
Kvs value: 5.5
For an accurate measuring or for higher flows, please refer to the curves shown in the next page.


The unit for 1/2” (130 mm) circulating pumps consists of:

  • Connection.
  • 3-way mixing valve with adjustable by-pass. Through the bypass
    (adjustable from the front part) it is possible to mix on the
    supply line a quantity of water coming back from the return
    line of the system, from 0 up to 50%.
  • High efficiency synchronous pre-wired circulating pump (for the models that include it).
  • Flanged ball valve supplied with in-handle thermometer (coded red, range 0°C-120°C).


  • VFlanged ball valve with non return valve 20 mbar (which can be excluded by rotating the handle by 45°)
    supplied with in-handle thermometer (coded blue; 0°C-120°C).
  • “T” Connection for mixing valve.
  • Connection.



Approximate data  for applications in low and medium temperature heating systems


Approximate power and flow of the installation

Recommended circulating pump

Residual lifting power

Approximate surface of the underfloor heating system

8 K

12 kW - 1300 l/h

Wilo Yonos Para RS 15/6

4,5 mH₂0

Up to 100 m²

8 K

17 kW - 1900 l/h

Wilo Yonos Para RS 15/7,5

5 mH0

Up to 170 m²

15 K

23 kW - 1300 l/h

Wilo Yonos Para RS 15/6

4,5 mH0


15 K

33 kW - 1900 l/h

Wilo Yonos Para RS 15/7,5

5 mH0



Working principle


During the regular working process, with the mixer completely closed on the recy cling for example, a part of the fluid is aspirated from the pump all along the by-pass line. This quantity of fluid (narrow blue arrow) represents 50% of the capacity of the mixer (red arrow). As a result, one has a very high delivery capacity and a reduced temperature.









Servomotor TRM20:


3 points servomotor for mixing valve, bidirectional,
Operating range of 90°, 230V, 105 s., torque 2 Nm. IP40.










Euroster 11M



Electronic, programmable controller designed for control of a three-way valve with actuator and CH circulation pump. It automatically maintains a constant temperature at a preset level or ensures a proper temperature of water in return piping in a CH system with coal-fired boiler. Possibility to connect a room thermostat. E11M controller is equipped with an AntiStop function which prevents seizure of the idle pump and valve rotor.


Controller function

  • keeps constant water temperature: in the central heating
    circuit or in boiler return
  • possibility of connecting room regulator
  • Anti-Stop function to protect pumps and valve against
  • frost protection
  • pump operation test
  • temperature reading correction


EUROSTER 11M operates in one of the two modes: heating medium temperature regulation (e.g. in floor heating) or return temperature stabilization. Operation mode is changed when restoring factory settings, provided for each of the modes.

Set 1: intended for system with heating medium temperature regulation

Set 2 intended for system with return temperature regulation


Technical specifications:

  • Power supply: 230V, 50Hz
  • Device controlled: mixing valve actuator, CH pump
  • Rated output load: 3 A 230 V 50 Hz
  • Rated power consumption: 1,6W
  • Operating temperature range: 5-40°C
  • Storage temperature range: 0-65°C
  • Temperature measurement range: 0-110°C
  • Temperature control range: 10-70°C (CH temperature congrol mode)
  • Temperature limit of starting pump unit: 20-80°C
  • Temperature control hysteresis: 2-10°C
  • Temperature control accuracy: 1°C
  • IP rating: IP40
  • Status visualization: backlit LCD
  • Colour: black
  • Mount method: wall-mounted, wall plugs
  • Weight (controller with cables): 0,76 kg
  • Certificates/standards: complies with the EMC and LVD Directives
  • Dimensions (W/HxD) mm: 150/90/52
  • Packing list: Euroster 11M controller, wall plugs, instructions,
    mounting template, sensor bands


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