BRV Bonetti Rubinetterie Valduggia S.r.l.


Regolare e distribuire energia pulita

ModvFresh Basic

Compact heat exchange unit to deliver fresh domestic hot water (DHW).

Product file

°Caleon Thermostat - Wi-Fi

Elegant chrono-thermostat with TFT capacitive touch panel. Wi-Fi N 2.4 Ghz connection for remote control by °Caleon app.

Product file

726 - Basic Series

Anti-scald thermostatic mixing valve for medium and small applications. Compact size. Available Kvs: 1.5, 1.8 and 3.4.

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Full bore 2-way zone ball valve, with bidirectional actuator with quick connection. Dimensions from 1/2" DN15 to 1"1/4 DN32.

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DomvS Clima

Control unit for manifolds of heating and cooling radiant panels up to 200 m2. Fixed point thermostatic mixer or motorized rotary mixing valve. LCD room control unit.

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Multifunctional compact hydraulic module for the management of a direct circuit, a mixed circuit and the production of domestic hot water (DHW)

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Mixing kit for ModvFresh Basic

35÷60°C thermostatic mixing kit designed for ModvFresh Basic, with anti-scald thermostatic mixing valve for small applications.

Product file

M2 MIX33 - DN20

2-Way pump unit with 3-way mixing valve with built-in by-pass

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


  • Connection.
  • 3-way mixing valve with adjustable by-pass. Through the by-pass (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.
  • Synchronous pre-wired circulating pump with cable 2 m. long (for the models that include it).
  • Flanged ball valve supplied with in-handle thermometer (coded red, range 0°C-120°C).


  • Flanged 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.

Centre distance 90 mm. EPP insulation box (Measurements: 180x302x142 mm).
PN 10, max temperature 110°C (unit without pump).
Connections: 3/4” Male with swivel tang to the heat source or to the distributor. 3/4” Female to the user.

For power up to 33 kW (with Δt 15 K) and maximum flow 1900 l/h.
Kvs Value: 5,5.
For an accurate measuring or for higher flows, please refer to the diagram.
Circulating pumps:
Wilo Yonos Para RS 15/6 RKC (C6)
Grundfos UPM3 AUTO L 15-70 (UL7)
Wilo Yonos Para RS 15/7,5 RKC (C8)

We suggest you to install two isolating valves Art. 552 3/4” (see "Distributor" section) before the pump unit to allow an easy service or replacement of the components of the unit.

The By-pass integrated into the 3-way mixing valve ensures a recyling inside the installation, even when the mixing valve is fully open. Through the by-pass, a fixed percent of the mixing can be set, in the case when the flow through the mixing valve is not sufficient.
Therefore, in case of a bad working of the system causing an increase of the temperature of the installation, the recycling through the by-pass allows a decrease in the temperature of the water in the undrefloor installation. This can be done mixing the warm water of the return circuit with the hot water of the supply circuit, reducing possible damages.

M2 MIX33 pump units are supplied with the recycling by-pass fully open.

Approximate data for applications in low and medium temperature heating systems
Δt Approximate power and
flow of the installation
circulating pump
lifting power
Approximate surface of
the underfloor heating system
8 K 12 kW - 1300 l/h Wilo Yonos Para RS 15/6 4,5 mH2O Up to 100 m2
8 K 17 kW - 1900 l/h Wilo Yonos Para RS 15/7,5 5 mH2O Up to 170 m2
15 K 23 kW - 1300 l/h Wilo Yonos Para RS 15/6 4,5 mH2O -
15 K 33 kW - 1900 l/h Wilo Yonos Para RS 15/7,5 5 mH2O -

Working principle

During the regular working process, with the mixer completely closed on the recycling for example, a part of the fluid is ispirated from the pump all along the by-pass line. As a result, one has a very high delivered capacity and a reduced temperature.

Adjusting the by-pass
Reference indicator Reference indicator
The By-pass is fully open and it
allows the maximum recycling.
The screwdriver cut is aligned along the reference indicator.
The By-pass is fully closed and there is no recycling.
The screwdriver cut is in an orthogonal position (at 90°) in comparison with the reference indicator.

TRM20 Servomotor

Servomotor TRM20: 3 points servomotor for mixing valve. Bidirectional, reversible.
Operating range of 90°, 230V, 105 s, torque 3 Nm. IP40.

Typical curves of the pump unit and of the circulating pumps

Click to zoom

Measuring and check of a DN20 system

  Clicking on the icon at side it is possible to download an Excel file dealing with the measuring and the check of a system consisting of one distributor and of up to three DN20 pump units. It is possible to select the model and the working parameters for each pump unit, so getting a check of the powers of the system and the residual lifting power for each way. In case of underfloor heating loops the maximum surface manageable is also estimated. Changing the starting data it is possible to simulate different employment situations and to make your considerations.

M2 MIX33:
Code: 20255R-M33 - with circ. pump: 20255R-M33-(C6/UL7/C8)

M2 MIX33 with built-in TRM20 servomotor:
Code: 20255R-M33-TRM - with circ. pump: 20255R-M33(C6/U7/C8)-TRM

Note: in units with pre-assembled pump, the pump
Grundfos UPM3 AUTO L 15-70 is identified in the code with U7.

Standard version: right supply.
Left supply version available with extra price: see price list.