WO2025186730A1

WO2025186730A1 - Modular device for the distribution of hot water in a room and system equipped with such a device

Info

Publication number: WO2025186730A1
Application number: PCT/IB2025/052371
Authority: WO
Inventors: Giuseppe Fugazza
Original assignee: FUGAS SpA
Current assignee: FUGAS SpA
Priority date: 2024-03-08
Filing date: 2025-03-05
Publication date: 2025-09-12
Anticipated expiration: 2026-09-08
Also published as: WO2025186730A8

Abstract

A modular device for distributing hot water in a room, said water being stored and heated in a remote tank (8) and being used for the production of domestic water and/or for flow in a heating system of said room, said device receiving said water from said tank (8) and comprising a heat exchanger (2) and valve members (15, 90; 42) which allow, even simultaneously, both the production of domestic hot water in said room and the flow of hot water in the heating system, said valve members (15, 90; 42) being motorized and controlled by a control unit (200) so that they can be activated independently of each other. A hot water and/or heating system is also claimed.

Description

MODULAR DEVICE FOR THE DI STRIBUTION OF HOT WATER IN A ROOM

AND SYSTEM EQUIPPED WITH SUCH A DEVICE

The ob j ect of the present invention is a modular device for distributing hot water in a room, according to the preamble of the ma j or claim . Also, an ob j ect of the invention is a system for the distribution of hot water to users within a living environment and/or for the production of hot water for domestic use within said environment using said modular device , according to the preamble of the corresponding ma j or claim .

The invention, in particular, refers to a modular device suitable to be used in systems for the production of hot water for room heating and/or for domestic hot water production in which the ' production ' of the heating fluid can also take place apart from the heated environment and where domestic hot water is used .

Such systems , such as the one known as ' districtheating ' , involve the remote production of the heating fluid by means of the most dif ferent techniques such as the one involving actual heating of water in tanks that are decentralized with respect to the environment s where this hot water is used . The heating can be obtained by means of heat pumps , gas burners , geothermal energy, photovoltaic systems or similar .

Devices are known which allow the use of such remotely produced hot water for heating an environment or for domestic use . In general , such devices comprise various component s including a heat exchanger to which hot water is supplied and in which the fluid to be heated ( for domestic or heating use ) also flows . Such a device also includes valve members suitable for regulating the flow of the heating fluid so as to control and regulate the temperature of the domestic water and use it in the environment .

In hydraulic systems where said device is used, various autonomous component s are present , such as flow regulators and electrically operated valves or in any case operated by external bodies ( such as a thermostat ) , electrically controlled . In such systems , said device is inserted within a box-shaped structure having piping suitable to receive the heating fluid remotely and send it back to the system producing such fluid, at least one pump, one or more safety valves and the neces sary component s for controlling the delivery of the water to radiators or taps in said environment . These component s are as sembled within the boxshaped structure according to the needs , an operation which entails an increase of the time required to build the plumbing system in the environment where the structure is to be used .

Moreover, the known solutions are still complex .

In addition to the above , the known devices do not provide the pos sibility of allowing hot water for domestic use and hot water for heating the environment to be generated simultaneously in the system where they are used . In other words , the systems which are using known devices do not allow that , while hot water is being supplied from a tap, hot water is simultaneously sent to room heating devices so that both domestic hot water and hot water for room heating can be generated at the same time .

For example , EP 1847781 describes a hydraulic circuit to supply an environment with water for heating and for domestic use . The circuit comprises a modular as sembly connected to flow and return water pipes connected in turn to a centralized hot water production system . Such modular as sembly comprises a flow part connected to the above- mentioned flow conduit and a return part connected to the above-mentioned return circuit . Such flow and return part s are connected to a heat exchanger .

The flow as sembly comprises a routing device or diverting device presenting a motorized three-way valve and connected to the flow conduit of the centralized system via a mixing valve , which is also motorized . Such diverting device receives the hot water from a mixing valve and direct s it to the heat exchanger or to a room heating system .

The return unit is connected to a water network and it regulates the water flow rate flowing in the system through a splitter valve connected to the heating system and the heat exchanger . A flow meter in the return unit connected to the water network and the heat exchanger allows hot water to be sent to the room taps .

Such prior art describes that two hot water flows can alternatively flow out of the flow unit , one leading to the heating system or alternatively to the heat exchanger .

Thus , in the system covered by the prior art , the simultaneous use of hot water from the centralized system both as domestic hot water and for heating is not provided .

EP2 642170 describes a (hydraulically operating) flow regulator and a hydraulic unit into which that regulator is inserted . The hydraulic unit comprises , in particular, a heat exchanger to which this flow regulator is connected and a connecting member to which a heated water conduit and a conduit for trans ferring hot water to a room heating system are connected . The water is heated by a remote water heating system . The connecting member is also connected to the heat exchanger .

Such prior art does also not provide for the simultaneous use of domestic hot water and hot water for room heating . The prior art clearly describes that as long as there is a demand for domest ic water, there is no pos sibility of using hot water, produced by the remote water heating system, for heating the room, and vice versa .

No control of the system water temperature is described .

EP 3361182 describes a hydraulic as sembly for a heating system . The hydraulic unit is connected to a primary heat exchanger such as a gas boiler and to two heating circuit s , a first one comprising radiators and a second one comprising underfloor heating . Such as sembly is also suitable for producing water for domestic use .

The hydraulic as sembly comprises motorized mixing and switching valves for hot water flow in the two room heating circuit s (with radiators and underfloor heating) . However, the prior art de scribes that the motors of the two valves must never be operated at the same time .

No water temperature controller is described .

Thus , known solutions such as those in the above- mentioned prior art document s do not envisage or exclude that domestic hot water is supplied at the same time as hot water flow in the heating system .

An aim of the present invention is to of fer a modular device for the distribution of hot water in a room, water which is used for the production of domestic hot water and which can also be used as a low-, medium- or high-temperature heating fluid, which is improved with respect to the known solutions and which is readily available for installation within that room .

In particular, an aim of the present invention is to of fer a modular device that also allows the simultaneous use of hot water for domestic use and for heating the room, thus avoiding the interruption of this room heating when domestic water is used .

Another aim of the present invention is to of fer a modular device of the above-mentioned kind that can be rapidly set up to produce simultaneously hot water for domestic use and for heating of a room, at low and/or medium temperatures , or alternatively to produce hot water for domestic use and for heating at high temperatures this room .

A further aim of the present invention is to of fer a device of the kind mentioned that is reliable in use and that of fers a high level of safety in all it s forms of use .

Another aim of the present invention is to of fer a hydraulic system to produce hot water for domestic use and to obtain the low/medium or high temperature heating of a room, said production also being simultaneous , the modular device mentioned above being used in said system, said system being simple and rapid to realize depending on the desired use of hot water .

These and other purposes that will be obvious to the one skilled in the art are achieved by a modular device and a system that uses this device according to the appended claims .

For a better understanding of the present invention, the following drawings are attached by way of illustration only, not to be intended as a limitation :

Figure 1 shows an exploded frontal perspective view of a first embodiment of a modular device according to the invention ;

Figure 2 shows an illustrative view of a hydraulic system realized using the device in Figure 1 and used for the production of domestic hot water and to heat a room at low/medium temperature , with high temperature disconnection ;

Figure 3 shows a perspective view of a dif ferent embodiment of the device in Figure 1 ;

Figure 4 shows an illustrative view of a hydraulic system for the production of domestic hot water and for high- temperature heating of a room, using the device in Figure . With reference to the above-mentioned figures , and initially in particular to Figures 1 and 2 , a hydraulic device 1 is suitable for the modulated distribution of centralized hot water to a hot water system at low/medium temperature for the heating of a room and suitable for using this centralized hot water to produce domestic hot water, advantageously at a preset temperature of e . g . 45 ° C .

The distribution of water to the heating system can also be simultaneous for domestic water production .

The system is generically indicated with 100 in Figure 2 .

Such device 1 comprises a heat exchanger 2 suitably dimensioned in terms of thermal length, number and type of plates . The plate heat exchanger 2 has a body 3 having, internally, usual paths for hot water, and water to be heated and for domestic use , indicated for the sake of simplicity by dashes 6 and 7 , respectively .

The hot water ( or ' technical water ' ) comes from a tank 8 where the water is heated by heating element s such as a heat pump 9 or a gas burner 10 , or a solar panel heating system 11 or by the combination of such heating element s . The tank 8 may receive remotely heated water via a districtheating circuit 12 , it self known . Such heating element s are known and will not be further described .

The hot water from the tank 8 may reach a first modulating valve member 15 which is fixed to the heat exchanger 2 of the device 1 through a conduit 1 6 which is connected to a first inlet 17 of said valve member 15 . The valve member 15 is of the type provided with a movable shutter 18 operated by an electric actuator 1 9 connected to and controlled by a control unit 200 which operates according to data recorded in the system 100 as will be described later . The movable shutter 18 has two valve interceptor elements 18A and 18B carried by a stem 18C actuated along its longitudinal axis of the electric actuator 19. Such interceptor elements are suitable for closing or opening corresponding openings 20 and 21 provided within the first valve member 15 so as to allow the hot water present in the conduit 16 to pass through the valve member 15 and to transit, in whole or in part, towards a first outlet 23 of said first modulating valve member 15 from which the fluid passes to the heat exchanger 2 (arrow K in Figure 1) . The water passes through a first inlet 24 provided in the body 3 of said heat exchanger 2 and connected to the (first) water path 6 present in the latter.

A second inlet 25 of the valve member 15 is connected to a return conduit 27 of a low-medium temperature heating system 28, and a second outlet 29 of said valve member 15 is connected to a conduit 33 of said low/medium temperature heating system 28.

Shutter 18 allows, in the position shown in Figure 2, the flow of hot water from the inlet 17 to the heat exchanger 2 (arrow K in Figures 1 and 2) in order to use it for the production of domestic hot water (as will be described) . Such shutter 18 also allows the simultaneous flow of (cold) water within the heating system at low to medium temperature (arrow F in Figure 2) . If the stem 18C is moved along its longitudinal axis by the electric actuator 19 (e.g. a stepper motor) , the opening 20 is opened and the opening 21 is closed: this allows the flow of at least part of the hot water, coming from the tank 8, also towards the low-medium temperature heating system 28 through the duct 33. If the stem 18C is partially moved, the interceptor elements 18A and 18B partialize the openings 20 and 21 in such a way that the hot water can mix with the colder water already present in the heating system and coming from the conduit 27 , and thus regulate the water temperature in the system 28 .

The position of the stem 18C and therefore of the interceptor element s 18A and 18B depends on data obtained from a usual temperature sensor 31 which detect s the temperature of the water in the conduit 33 of the low-medium temperature heating system 28 and connected to the control unit 200 : the temperature sensor 31 allows the temperature of the heating water to be maintained at a predetermined value . One or more thermostat s 210 ( only one shown in Figure 2 ) connected to the control unit 200 allow the room where the system 28 is located to be heated to the desired temperature . In fact , when there is the need to heat the room, the control unit 200 receives the signal emitted by the thermostat 210 and moves the shutter 18 in the valve member 15 so as to obtain the flow of hot water more or less mixed with colder water within the heating system 28 in order to obtain the desired temperature in the room .

The first valve member 15 is connected to the heat exchanger 2 with an inlet 34 thereof connected to an outlet 35 of the heat exchanger which is connected in turn to the ( second) path 7 of the water to be heated . The first valve member 15 has an outlet 38 from which such water coming from the path 7 of the heat exchanger is directed to a domestic hot water conduit 39 . There is a temperature sensor 40 on such conduit 39 connected to the control unit 200 and which detect s the temperature of the domestic hot water outgoing the exchanger and entering a usual domestic hot water hydraulic circuit 41 . Such hydraulic circuit includes a conduit 57 , at the inlet of the heat exchanger 2 , on which a flowmeter 59 , connected to the control unit 200 , is placed .

The control unit 200 , on the basis of the data coming from the flowmeter 59 , act s on a second valve member 42 , also connected to the heat exchanger 2 , and enables the flow of the incoming water within the heat exchanger and it s heating .

It should be noted that by moving the stem 18C along it s axis as described above , in order to open the opening 20 and to close the opening 21 , it is also pos sible to have a simultaneous hot water flow in the heating system 28 ( as described above ) and a simultaneous flow of domestic hot water in the hydraulic circuit 41 due to the water flowing through the heat exchanger 2 ; the water flowing along the path 6 of the heat exchanger controlled by the second valve member 42 implemented regardles s of the first valve member 15 ( see Figures 1 and 3 ) , allows the simultaneous heating of domestic hot water together with the use of the heating system . This is due to the fact that the valve members 15 and 42 are independent of each other, and they can be operated independently based on the request s of a user, or on the programming, or on the request for heating the room; consequently, it is also pos sible to have domestic hot water production and water flow in the heating system at the same time .

The second valve member will be referred to as a valve member for domest ic water flow or simply for domest ic water 42 .

It should be noted that the low- and medium-temperature heating system 28 also comprises a pump 45 for the water flow and the above-mentioned conduit 27 . A return conduit 46 , which terminates in the tank 8 , is also connected to the latter . The pump 45 is also controlled by the above-mentioned control unit 200 .

The return conduit 4 6 is also connected to a conduit 4 9 which is connected in turn to an outlet 50 of the domestic water valve member 42 . Water from the first path 6 inside the heat exchanger ( see arrow L in Figure 1 ) flows to said outlet 50 , this water has given up heat to the water which flows in the second path 7 and which exit s the heat exchanger via an outlet 51 . This outlet 51 is connected to an inlet 53 of the domestic water valve member 42 which is connected in turn to the outlet 50 of such member .

In the domestic water valve member 42 there is placed a movable plug 52 having a movable stem 54 bearing an interceptor element 55 suitable for cooperating with an opening 56 inside the valve member 42 connecting said inlet 53 with the outlet 50 of said valve member 42 . The shutter 52 is moved by an electric actuator, for example an electric stepper motor 58 controlled by the control unit 200 . The shutter 52 can open or close the connection between the inlet and the outlet 50 of the valve member 42 and thereby allow the heating of the domestic water flow in the hydraulic circuit 41 . As mentioned, on said circuit 41 there is a flowmeter 59 which, in the embodiment of the invention displayed in the figures , is as sociated with the valve member 42 . Obviously, the flowmeter 59 can also be an autonomous member placed on the circuit 41 .

The valve member 42 ( and in the case of the figure s , through the flowmeter 59 ) is connected through an inlet 63 of it s , to the water inlet conduit 57 of such hydraulic circuit 41 . The water flows inside an inlet 60 of the heat exchanger 2 ( arrow Y in Figure 1 ) from the inlet 63 , this heat exchanger being connected to the second path 7 of the water to be heated present in said heat exchanger .

Therefore , if there is a demand for domestic hot water detected by the f lowmeter 59 , the shutter 52 is actuated and the interceptor element 55 is moved away from the opening 56 . Hot water can then flow along the path 6 within the heat exchanger and can thus heat the water flowing in the domestic water hydraulic circuit 41 . It should be noted that the hot water coming from the tank 8 can flow through the first valve member 15 without being intercepted, the valve member 42 being the only one controlling and regulating the hot water flow through the heat exchanger .

When the flowmeter 59 , which is also controlled by the control unit 200 , detect s that the demand for domestic hot water has ceased, it interrupt s the generation of the signal detected by the control unit 200 , and the latter closes the opening 56 within the valve member 42 by means of the movement of the shutter 52 enabled by the actuator 58 also under the control of the control unit 200 .

Thanks to the invention, by independently activating the shutters 18 and 52 of the first valve member 15 and of the second valve member 52 by means of the corresponding motors 19 and 58 , it is pos sible to bring such shutters , at the same time and period, to positions such as to allow the production of hot water for domestic use ( " dome stic hot water" ) and for the heating system . Obviously, by activating said motors 1 9 and 50 at dif ferent times , it is also pos sible to obtain only the production of domestic hot water or the flow of hot water in the heating system .

Figure 2 shows further arrows indicating the water flows in the various conduit s of system 100 and dashed conduit s of electrical interface .

It should be noted that a pump 65 is located on the conduit 1 6 and that from such conduit a conduit 66 branches of f and carries high-temperature water, coming directly from tank 8 , to any radiating element s 69 such as towel heaters present in the room .

It should be noted that the command and control of the pumps 45 and 65 by the control unit 200 allows to have a sufficient quantity of hot water in the tank 8 so that a user's request for domestic hot water leads to a substantially immediate delivery of such water due precisely to the hot water maintained at the appropriate temperature and volume in tank 8. This is on a similar basis of the instantaneous delivery of hot water in current systems equipped with gas burner boilers .

Thanks to the presence and control (by means of the motor 58) of the domestic water valve member 42, it is possible to appropriately regulate the flow of hot water in the heat exchanger in order to produce hot water for domestic use. Moreover, by means of the presence also of the first valve member 15, independently operated/ controlled by means of the motor 19, and due to its connections to the heat exchanger to the domestic water hydraulic circuit and to the low/medium temperature heating circuit, the modular device 1 allows the rapid realization of a hydraulic circuit 100 which is also capable of simultaneously supplying domestic hot water, medium/low temperature heating hot water as well as possibly high temperature hot water.

The device 1 is, as mentioned above, of the modular type. In fact, by replacing the first valve member 15 with another valve member, it is possible to prepare the device 1 also for the simultaneous generation of domestic hot water and of water for a high-temperature heating circuit (e.g. for heating a room by means of radiators) .

Figures 3 and 4 show a system 100A for the also simultaneous (when necessary) generation of domestic water and for the flow of high temperature hot water within radiators or heaters 170, e.g. wall radiators, for room heating. In the figures under consideration, the parts corresponding to those in the figures already described are indicated with the same reference numbers. The modular device 1 still has the valve member 42 for obtaining domestic water production in the hydraulic circuit 41 . However, the first valve member of Figures 1 and 2 is replaced by a third valve member 90 connected to the heat exchanger 2 and to a high-temperature heating system 28A presenting radiators 170 .

This third valve member 90 has an inlet 91 connected to the tank 8 , an internal shutter 93 having a movable stem 94 controlled by an electric actuator 95 connected to the control unit 200 . The stem carries only an interceptor element 96 (unlike the first valve member 15 ) suitable for closing and opening an opening or pas sage 97 . The position of said interceptor element 96 (moved by the electric motor 95 independently of the shutter 52 of the second valve member 42 ) and thus the opening or closing of the pas sage 97 can only allow the direct connection of the conduit 1 6 to an outlet 92 connected to the inlet 24 of the heat exchanger 20 ( shutter 93 closed) or allow the flowing of the hot water at high temperature also within a conduit 98 connecting, via an outlet 99 , said third valve member 90 to the radiators 170 and on which the temperature sensor 31 is present .

Also in this case , the valve member 42 control s the functioning of the domestic water system; the third valve member 90 control s the flow of water for the radiator heating system .

As in the case shown in Figures 1 and 2 , the two valve members 42 and 90 can also operate in such a way as to allow the simultaneous production of domestic hot water and for the heating system 28A .

Thanks to the invention, a modular device 1 is realized and that allows it self , with just a few modifications , to be used for the production of hot water for domestic use only, and/or also in addition to such production, to addres s water towards a medium/low-temperature heating system (where hot water at high temperature is mixed with colder water ) or to addres s high-temperature water into radiant element s of a room heating system .

Depending on the use , the device 1 will always have the basic component s defined by the plate heat exchanger 2 and the valve member 42 to enable the production of hot water for domestic use ; depending on the ultimate use and on the system in which the device 1 is used, the first or third valve member 15 or 90 will then be connected to the plate heat exchanger 2 .

Device 1 is thus prepared by the manufacturer for the ultimate use already at the initial as sembly stage . Such device is fully tested in order to be immediately usable during the installation phase in the environment ( ' complete kit ' ) .

All in a rapid and easy way .

Various embodiment s of the invention have been described, but the es sential features of the invent ion are defined by the tenor of the following claims .

Claims

1. A modular device for the distribution of hot water in a room, said hot water being used for the production of hot water for domestic use in a hydraulic circuit for water for domestic use (41) and in a medium/low temperature (28) or high temperature (28A) room heating system, said modular device comprising a heat exchanger (2) functionally connected to a valve member (15, 90) which allows the delivery of hot water to the heating system (28, 28A) and to a second valve member (42) which allows the production of hot water for domestic use for said room, characterized in that both said valve members are motorized and they are controllable by a control unit (200) depending on the condition of the hydraulic circuit (41) for the domestic hot water and of the heating system (28, 28A) in such a way as to allow the use of said hot water simultaneously both for the production of domestic hot water and for flow in the heating system of the room.

2. The modular device according to claim 1, characterized in that said valve member enabling the delivery of hot water to the heating system is a first valve member (15) provided with a shutter (18) movable under the control of an actuator (19) and it has two interceptor elements (18A, 18B) placed, movable, on corresponding two openings (20, 21) located inside said first valve member (15) having a first inlet (17) to which hot water to be used in the room is delivered, a first outlet (23) connected to the heat exchanger (2) and a second outlet (29) connected to a conduit (33) of the low/medium temperature heating system (28) , said first valve member (15) comprising a second inlet (25) connected to a return conduit (27) of water from said heating system (28) , the position of said interceptor elements (18A, 18B) with respect to said corresponding openings (20 21) allowing to send hot water only to the heat exchanger (2) or to send at the same time a part of such hot water to the heat exchanger (2) and to the conduit (33) of the heating system, possibly mixed with the water flowing through the second inlet (25) of said first valve member (15) , in this second case being possible to have the simultaneous production of hot water for domestic use and the activation of such heating system.

3. The modular device according to claim 1, characterized in that the valve member allowing the delivery of hot water to the heating system is a third valve member (90) provided with an internal shutter (93) movable under the control of an actuator (95) and carrying a single interceptor element (96) suitable for cooperating with an internal opening (97) of said second valve member (90) , said third valve member (90) having an inlet (91) to which hot water to be used in the room is delivered, a first outlet (92) connected to the heat exchanger (2) and a second outlet (99) connected to a duct (98) of the high temperature heating system (28A) of the room, the position of said intercepting element (96) with respect to said internal opening (97) allowing the delivery of hot water to the heat exchanger (2) only, or the simultaneous delivery of part of said hot water to the heat exchanger (2) and to the duct (98) of the heating system, in this second case being possible to have the simultaneous production of hot water for domestic use and the activation of said heating system (28A) .

4. The modular device according to claims 2 or 3, characterized in that it further comprises said actuator (19, 95) which is an electric motor, preferably of the stepper type.

5. The modular device according to claims 2 or 3, characterized in that it further comprises said electric actuator (19, 95) which is connectable to the control unit (200) .

6. The modular device according to claim 1, characterized in that the heat exchanger is a plate heat exchanger.

7. The modular device according to claim 1, characterized in that said second valve member (42) comprises an inlet (63) connected to a conduit (57) of the hydraulic circuit for water for domestic use in which water to be heated flows, said second valve member (42) being connected to a first path (6) of the heat exchanger (2) in which hot water flows this water being suitable for heating water which flows along a second path (7) of the heat exchanger connected to the second valve member (42) and which receives said water to be heated, said second valve member internally comprising a movable shutter (52) presenting an interceptor element (55) suitable for cooperating with an opening (56) internal to said second valve member (42) , depending on its position on said opening (56) , said movable shutter (52) being moved by an electric actuator and said movable shutter (52) being capable of opening or closing a connection between an outlet (50) of said second valve member (42) and the first path (6) of the heat exchanger connected to said second valve member, so allowing or not the heating of the domestic water flowing in the respective hydraulic circuit (41) .

8. The modular device according to claim 7, characterized in that the first path (6) of the heat exchanger (2) is connected to the valve member (15, 90) connected to the room heating circuit and it receives hot water through said valve member .

9. A hydraulic system (100, 100A) for distributing hot water to a room, comprising a modular device according to claim 1 and a tank (8) , said hot water being contained in said tank (8) wherein, in use, it is heated, said tank (8) comprising an outlet conduit (16) for distributing said hot water to the room and connected to said modular device, said system (100, 100A) further comprising a circuit for water for domestic use (41) to allow at least the use of the hot water for the production of water for domestic use flowing in said domestic water circuit (41) , said system (100, 100A) further comprising a return conduit (46) , the water returning through said return conduit (46) to said tank (8) , characterized in that said outlet conduit (16) from said tank (8) is connected to a valve member (15, 90) of said modular device (1) which is replaceable and which is connected in turn to the heat exchanger (2) of said modular device (1) , the second valve member (42) of said modular device (1) being provided with a shutter (52) controllable by an actuator (58) which is controllable by a control unit (200) and being connected only to the domestic hot water circuit (41) and to the return conduit (46) , said replaceable valve member (15, 90) being suitable for being alternatively connected to a low/medium temperature heating system, to a high temperature heating system, or to the domestic hot water hydraulic circuit (41) , said replaceable valve member (15, 90) being provided with a shutter (18, 93) controllable by an actuator (19, 95) which is controllable by the control unit, said replaceable valve member (15, 90) being connected to said domestic hot water hydraulic circuit (41) even when during use, it is connected to a heating system and always allowing the heating of domestic water by means of the flow of the latter in the heat exchanger (2) , in said heat exchanger also flowing the hot water coming from the tank (8) which enters the heat exchanger (2) through said replaceable valve member (15, 90) and exits through said valve member (42) connected to the conduit (46) for the return of the water to the tank (8) , said control unit controlling the actuators (19, 95; 58) of said replaceable valve member (15, 90) and of said second valve member (42) in such a way as to allow only domestic water production, only hot water flow in the heating system (100, 100A) or simultaneous domestic water production and hot water flow in the heating system (100, 100A) .

10. The hydraulic system according to claim 9, comprising a low/medium temperature heating system (28) , characterized in that said replaceable valve member (15) is suitable for allowing water present in said low/medium temperature heating system (28) to be mixed with hot water coming from the tank, said replaceable valve member having a movable shutter (18) controllable by the actuator (19) which is controllable by the control unit (200) to which data related to the temperature of said mixed water detected by means of a temperature sensor (31) which detects the temperature of said water, and data related to the temperature of the room detected by means of a room thermostat (210) are received.

11. The hydraulic system according to claim 9, characterized in that it further comprises a conduit (66) , said modular device (1) being suitable for being bypassed by said conduit (66) which is suitable for supplying hot water which is coming directly from the tank (8) to radiating elements of the room.

12. The hydraulic system according to claim 10, characterized in that it is arranged in such a way that hot water coming from the tank (8) and hot water flowing in the low/medium temperature heating system (28) are mixed in the replaceable valve member (15) .

13. The hydraulic system according to claim 9, comprising a high temperature heating system (28A) , characterized in that it comprises the shutter (93) controllable by the actuator (95) which is controllable by the control unit (200) which detects the heating demand of the room by means of a thermostat (210) located in the room, where said heating system (28A) is present.

14. The hydraulic system according to claim 10, characterized in that the valve member (42) which is connected to the return conduit (46) of the water to the tank (8) and to the domestic hot water circuit (41) comprises a flow meter (59) .