BRV Bonetti Rubinetterie Valduggia S.r.l.


Regolare e distribuire energia pulita

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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Modular multi-zone distribution box for wall-mounted gas boilers or heat pumps. Three types of available pump units: direct, mixed motorized, mixed fixed point.

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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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ModvFresh Basic

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

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°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.

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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.

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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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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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ModvFresh 4

Pump unit to deliver fresh hot domestic water (HDW) with electronic control. High efficiency pumps and control of return temperature of primary loop. Thermostat function.
Employment: on the inertial cylinders or similar, connected to solar thermal installations, wood, pellets, biomass boilers etc. It provides fresh hot domestic water, avoiding phenomena of bacterial pollution, such as the legionnaire’s disease etc., made by the stagnation of the hot water.
 Control and management of the integration source of the water tank in order to maintain the water temperature at the lowest necessary level. Optimization of control of return temperature to storage tank thanks to the control for diverting valve (the valve is optional).

This unit, by a special electronic controller, modulates the speed of the primary circulating pump, from a minimum speed of 10% up to 100%, in order to provide always a precise temperature of the exploitation of the water (f.i. 45°C). The variation of the requested flow is suddenly recorded by a digital sensor that gives the inputs of the flow and the temperature to the electronic controller, modulating the speed of the circulating pump accordingly.
Three models available, fully pre-assembled and pre-wired:
  • 50 kW, with variable flow from 1 up to 20 l/min, suitable for domestic use installations;
  • 100 and 125 kW, with variable flow from 2 up to 40 l/min, suitable for small commercial installations;
with the followings specifications:
  • High efficiency circulating pumps and control of return temperature of primary loop by a diverting valve (optional);
  • Function of thermostat integration of the storage tank: it activates the energy source in case water temperature of the storage tank does not comply with set up timetables;
  • External sensor boxes to connect easily external sensors and relays.
  • Delivered water temperature: 45°C with a supply water temperature of 10°C. Consequently the power is about 98 kW at the flow of 40 l/min.
  • The 125 kW model allows to operate with lower temperatures in the buffer tank, or to deliver the same flow rate at a higher temperature;
  • Anyway the temperature of the HDW is adjustable every single degree up to 70°C;
  • The minimum requested inlet temperature to the heat exchanger is 60°C in order to guarantee the declared performaces to the maximum flow (with 35 K thermal ?t);
  • A big surface heat exchanger weld-braised plate made in stainless steel AISI 316 guarantees a remarkable thermal exchange that allows a water return to the puffer with a temperature until 20°C. This favours a perfect heatig power from the solar or heating pump contribution;
  • Available with our without recycling circulating pump (funcionning “on request” or “by time bands”; adjustable temperature until 40°C);
  • Recycling way circulating pump (in the models where it is present): the asynchronous or synchronous high efficiency model is available;
  • The heat exchanger can be easily removed in case of maintenance and/of cleaning;
  • A digital sensor allows an accurate power recording (total, yearly, monthly, weekly and daily);
  • PPE insulation box (398 x 500 x 207 mm). A special back plate fixes the unit to the insulation box and it allows a quick fitting to the wall or to the solar cylinder;
  • The pump unit is supplied with 3/4” Male connections (pipe-union).
A special ball valves kit, on request (to be ordered), completes the installation.
For a maximum power of 125 kW and flow up to 40 l/min.
Nominal supply temperature of the storage tank: 60°C.
Nominal temperature of the water supply: 10°C.
Nominal temperature of HDW production: 45°C, adjustable from 30°C to 70°C.
Recycling line temperature adjustable from 10°C up to 40°C.
ModvFresh 4 different hydraulic schemes

Delivery of HDW
Delivery of HDW with recycling

Preset schemes of ModvFresh 4 controller can be enriched in an easy and flexible way by two additional functions: additional heating with thermostat function and/or control of return temperature to storage tank by a diverting valve (optional). To make it easy, hereafter scheme shows the model with active recycling, however it is also possible to configurate the same scheme without recycling.

elivery of HDW with recycling and
additional thermostat function
Delivery of HDW with recycling and
control of return temperature
Delivery of HDW with recycling,
additional thermostat function and
control of return temperature (*)

(*) Please note: in scheme 5, the controller considers 25°C as fixed temperature inside the storage tank to manage the deviation. In case you would need to read the temperature and process the value in the controllers, it is necessary to order separately a TT/S2 sensor and to wire it to sensor box.

Relay box
Sensor box
For a fast and easy connection of the temperature sensors, vannes or circulating pumps you do not have to handle the controller, it is enough to plug the cables in the automatic connectors of the sensor box.
Sensor box

Technical Features

Maximum allowed pressure
(without water hammer):
6 bar

Working temperature:
2 ÷ 95 °C

Headloss in the secondary circuit
at the flow of 20 l/min (50 kW model):
4 mH2O

Headloss in the secondary circuit
at the flow of 40 l/min (100 kW model):
5 mH2O

Headloss in the secondary circuit
at the flow of 40 l/min (125 kW model):
6 mH2O

Headloss in the recycling circuit
(at the flow 5 l/min)
0,3 mH2O

Minimum diameter size of the pipes: DN20 (Cu 22x1); DN15 for the recycling line

Peculiar diagram of the recycling
circulating pump (if present)

High efficiency synchronous circulating pump
The speed control is always variable by means of the selector; you can find the speeds corresponding to the 7 reference
marks along the selector scale.

A test report of the VFS is available. It shows the result of the tests made directly in the Grundfos Labs.
Pump unit assembled with optional ball valves kit

DANGER OF SCALDS: To avoid scalds to the user the supplied water must never be over 60°C. This temperature limit is preselected into the controller, anyway it can be reduced.

Calculation of the performances of the pump unit

  Click on the icon here at side and download an Excel file dedicated to the calculation of the performances of ModvFresh pump units. Starting from the installation data and taking into consideration the diagrams of the following section the supplied power, the supply time, the overall flow and the re-establishment time of the storage tank temperature are calculated. Changing the starting data you can simulate various and different utilization situations and do your remarks.

The buffer temperature must be almost 5 K higher than the desired temperature of the domestic water.
Bigger temperature differences allow to extend the tapping time.

The controller of the sole product ModvFresh with recycling line, in order to avoid the bacterial pollution in the HDW circuit, is equipped with a specific disinfection program that rises significantly the temperature in the recycling line, killing the eventual bacteria inside. Consequently, during this operation, also the hot water to the user reaches very high temperatures, causing the risk of instantaneous scalds. Therefore, it is raccomended to set the start of the disinfection’s program in a time when the water request from the user is low (f.i. during the night) and, however, to instal a security anti-scald device in the outlets considered dangerous.

Units without recycling:
Code 50 kW, 3/4”: 031400-50-20
Code 100 kW, 3/4”: 031400-100-40
Code 125 kW, 3/4”: 031400-125-40

Units with recycling:
Code 50 kW, 3/4”: 031415-50-20
Code 100 kW, 3/4”: 031415-100-40
Code 125 kW, 3/4”: 031415-125-40