PT104738B - WATER SAVING SYSTEM FOR USE IN ESQUENTADORES OR IN HOT WATER SUPPLY BOILERS - Google Patents

Abstract

The present invention relates to a water storage system for use in water heaters or boilers, comprising two water selector systems (24) and (25) and an accumulation tank (1), which allows to save water IN ESQUENTADORES OR IN HOT WATER SUPPLY BOILERS. THE SYSTEM AUTOMATICALLY OPERATES WITHOUT PRESSURE AND WATER TEMPERATURE AT CERTAIN SYSTEM POINTS. THE MAIN OBJECTIVE OF THE SYSTEM IS TO ENSURE THAT, IN NORMAL CONDITIONS OF THE ESQUENTOR OR THE HOT WATER SUPPLY BOILER, ONLY WILL WATER WATER IF THEY ARE AT A HIGHER OR EQUIVALENT TEMPERATURE. IF, IN THE INITIAL PHASE OF THE ESQUINTER OR BOILER OPERATION, THERE IS NO HOT WATER AT YOUR EXIT, OUTPUT WATER CURRENT IS FORWARDED TO THE ACCUMULATION RESERVOIR. The water thus accumulated under pressure is subsequently used as feedstock water of the hot water supplying boiler or extinguisher. The present invention is incorporated in the construction industry of hot water heaters or boilers, which can be used for household purposes or other purposes, where water heating can be done by burning of fuels, the use of hot gases , OR BY ELECTRICAL RESISTANCE.

Description

DESCRIPTION

WATER SAVING SYSTEM TO BE USED IN HEATERS OR HOT WATER BOILERS

Technical field of the invention

The present invention relates to a water saving system to be installed in water heaters or hot water boilers, which allows to save water in domestic or industrial installations, consisting of two water selector systems and a water reservoir. accumulation of water under pressure. The system operates automatically as a function of water pressure and temperature at some points in the system.

The present invention relates to the hot water boiler or boiler construction industry which can be used for domestic or other purposes, where water heating can be done by burning fuels, using hot gases. , or by means of electrical resistors.

Background of the invention

The usual water heaters or boilers have the problem that during the initial operation they do not provide hot water at their outlet. Therefore, water reaching the valves or points of use does not meet the user's temperature requirements, and this drinking water is usually discharged directly into the sewer.

If water heaters or hot water boilers incorporate the proposed system, their outlet to the hot water points will only provide hot water, thus promoting the proposed system to save drinking water in domestic or other installations. .

In the initial phase of operation of the water heater or hot water boiler, where it is initially cold or partially cold and filled with cold or partially cold water, and while there is no hot water at its outlet, cold or partially cold water existing at its outlet is sent to an accumulation reservoir, where it is accumulated under pressure, and is therefore not released into the sewage.

The water thus accumulated under pressure is subsequently used as feed water for the water heater or hot water boiler, and is therefore water to be reused to feed the system which caused it to accumulate.

The length of time required for hot water to escape from the water heater or hot water boiler when it is started depends on the mass of the system, the amount of water it may contain, the flow rate. water flow through it, and the available heating power, thus varying from case to case but essentially a well-defined feature for each type of water heater or hot water boiler. The size or capacity of the accumulation system is therefore dependent on the amount of cold or partially cold water that would be discharged into the sewer if the proposed system is not used.

There is therefore an opportunity for water-saving systems to be incorporated in water heaters or hot-water boilers, which have auxiliary water-saving means available for later use as drinking water, the cooler drinking water that for some time comes out of the water heaters or boilers and is usually discharged into the sewer.

Additionally, there is also the opportunity for water saving systems to be used in conjunction with valves or hot water utilization systems in case hot water is not ensured at the inlet of such systems. However, the nature of such systems differs from the proposal, which applies to ensure that only hot water at the outlet of the water heater or boiler in which the system is installed is sufficiently high to supply the valves or hot water points, thus meeting user requirements.

The proposed system operates automatically, depending on the temperature and water pressure at certain points in the system, and its operation does not therefore require human intervention. During the initial operation of the water heater or hot water boiler, when cold or partially cold water is being routed to the accumulation system, there is no water outflow from the system as a whole but only an internal circulation. from the inlet to the accumulation reservoir.

The proposed system may be implemented from scratch in the water heaters or boilers, or may be installed without difficulty in pre-existing water heaters or boilers.

To date, several systems have been proposed, with the same fundamental objective of saving drinking water during the initial period of operation of the systems, when there is no hot water available, in domestic or other installations, for example. and in chronological order:

Systems that provide for the use of an electrically powered recirculating water pump which forwards outgoing water that is cold or partially cold to the inlet of the water heater or boiler. While such systems are well-suited to the potable water saving function, they require the use of a recirculating water pump and its power supply.

US4737615 discloses an energy saving system for an electrically powered hot water boiler, the proposed system consisting essentially of alternatives for controlling and controlling the electric heating elements.

Another possibility is the use of electrically powered auxiliary heating systems which are called upon to intervene during the initial period when there is no hot water at the exit of the water heater or boiler to provide additional heating of water that does not was achieved by the water heater or boiler itself.

The systems proposed in national patent applications PT104037 and PT104138 have the same basic purpose as the system proposed in the present invention, which is the saving of drinking water in the initial operating periods when no hot water is available yet. However, these systems are to be used in mixing valves using hot water from water heaters or hot water boilers, and the system is now proposed to be incorporated into the water heater or hot water boiler to ensure that the stream of water coming out of it is in the temperature conditions required for its intended use. Purely mechanical systems are not known, and do not require additional auxiliary energy sources, such as that proposed in the present invention, to promote the saving of drinking water in water heaters or hot water boilers.

Description of the figures

Figure 1 and Figure 1a - Schematic representations of the proposed system, where the indicated numbers represent:

- Accumulation reservoir

- Non-return valve

- Heating zone of water heater or hot water boiler

- Plunger

- Spring

- Perforated disc to be traversed by the element (7)

- Mechanical abutment element of rod (9), spring (10) and piston (4)

- Expandable bulb (receiving signal from expandable bulb (12))

- Expandable bulb stem (8)

- Spring

- Information transfer channel between bulbs (12) and (8)

- Expandable bulb

- Expandable bulb

- Sprouting bulb stem (13)

- Perforated plunger

- Connection rod for perforated piston (15) and piston (17)

- Plunger

- Spring

- Plunger

- Spring

- Non-return valve

- Mains cold water inlet current to the water heater or hot water boiler

- Water flow from the water heater or hot water boiler

- Water selector system

- Water selector system

The accumulation system shown schematically in Figs. 1a and 1b may be housed in the most convenient location and shall be in the vicinity as close as possible to the heating zone (3) of the water heater or the hot water boiler.

The proposed system can be implemented smoothly in pre-existing water heaters or boilers by simply replacing the water inlet on the water heater or boiler with the water selector system (24) and the water outlet from the water heater or boiler by the system. water selector (25).

General Description of the Invention The system object of the present invention, which is installed in water heaters or hot water boilers, consists of two water selector systems 24 and 25, and a water storage reservoir under pressure (1).

The water selector system (25) comprises the swelling bulb (13), the rod (14) that moves to the right when the swiveling bulb (13) swells, the perforated plunger (15), the plunger (17), the rod (16) connecting pistons (15) and (17), and by spring (18). This water selector system (25) further comprises the outlet pressure sensing device (23) and is comprised of the piston (19), spring (20) and non-return valve (21). The expandable bulb (12), although installed in the water selector system (25) will effect its expansion action on the expandable bulb (8) of the water selector system (24), the signal of the bulb (12) being transmitted. through the transfer channel (11), in the form of an increase or decrease in volume of the fluid contained in the swelling bulb, which fluid also fills the transfer channel (11), which is reflected in the form of an increase or decrease. volume, respectively, in the expandable bulb (8).

water selector system (25) evaluates the temperature of the water leaving the heating zone (3) of the water heater or boiler, the expansion bulb (13) making this assessment, as well as the pressure of the accumulator (1), and directs water to the water heater or boiler outlet (23) if the outlet temperature is at or above the desired value as the assembly formed by the plungers (15) and (17) and the rod (16) moves to to the right, or if the pressure of the accumulator is such that it indicates that the accumulator (1) is already charged with water, or otherwise directs the water to the accumulator (1).

The water selector system (25) further includes a water pressure detector at the outlet (23), and if there is a high pressure there it means that the outlet (23) is closed, that there is no hot water demand from the devices using hot water, and in that case no water is sent to the storage tank (1).

The water selector system (24) comprises the swelling bulb (8), the piston (4), the spring (5), the perforated disc (6), the stem (9), the spring (10) and the mechanical element. of connection (7).

The water selector system 24, by means of the expansion bulbs 12 and 8, which are connected by the signal transfer channel 11, evaluates the temperature of the water leaving the heating zone (3) of the heater or boiler, as well as the pressure of the accumulator (1), and opens the cold water inlet from the mains (22) if the water at the outlet of the heating zone (3) is not hot enough or if the pressure of the accumulator ( 1) indicates that it is not fully charged. Conversely, if the water at the outlet of the heating zone (3) is sufficiently hot and if the pressure of the accumulator (1) indicates that it is fully charged, the water selector system (24) acts to close the inlet of the cold water from the mains (22) and allow the pressurized water in the accumulator (1) to be brought into the heating zone (3) of the water heater or the hot water boiler.

The various modes of operation of the water selector system (25) can be described as:

1. When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is not fully charged with water and the outlet (23) is open so that the pressure exerted the water from the outlet (23) over the piston (19) does not cause it to close the passage to the accumulator (1), the water leaving the heating zone (3) is directed to the accumulator (1).

2. When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is not fully charged with water, and the outlet (23) is closed, meaning no requests hot water by the users, so that the pressure exerted by the water seeking the outlet (23) on the piston (19) causes it to close the passage to the accumulator (1), there is no water leaving the outlet (23) as well as there is no water flow to the accumulator (1), so there is no water flow from the heating zone (3).

3. When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is fully charged with water and the outlet (23) is open so that the pressure exerted by the water from the outlet (23) over the piston (19) does not cause it to close the passage to the accumulator (1), cold or partially cold water leaving the heating zone (3) is not directed to the accumulator (1) but to the outlet (23) since the pressure in the accumulator acts on the piston (17) and forces it to move to the right, as does the perforated piston (15), thus

leaving free the passage of Water from the exit of the zone in heating (3) to the exit (23). In these conditions, The temperature gives water at the outlet (23) Can be bottom The intended by users but in this situation O

The accumulator (1) is already fully charged with water and does not allow more water to accumulate inside it.

4. When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is fully charged with water, and the outlet (23) is closed, meaning that there are no requests for hot water by the users, so that the pressure exerted by the water seeking the outlet (23) on the plunger (19) causes it to close the passage to the accumulator (1), there is no water leaving the outlet ( 23) and there is no water flow to the accumulator (1), so there is no water flowing from the heating zone (3).

5. When the water temperature outside the heating zone (3) is sufficiently high, the expandable bulb (13) moves the rod (14) to the right, and it pushes the perforated piston (15) to the right so as to to allow the passage of water from the heating zone (3) towards the outlet (23). If the outlet (23) is open, hot water from the heating zone (3) proceeds to the outlet (23) and thereafter for the intended uses.

6. When the water temperature at the exit of the heating zone (3) is sufficiently high, the expandable bulb (13) moves the rod (14) to the right, and it pushes the perforated plunger (15) to the right so as to to allow the passage of water from the heating zone (3) towards the outlet (23). If the outlet (23) is closed, there is no water flowing from the heating zone (3) to the outlet (23), and in this case there is also no water to the accumulator as the pressure at the outlet (23) is such that the piston (19) closes any hot water from the heating zone outlet (3) to the accumulator (1).

The various modes of operation of the water selector system (24) can be described as:

1. When the water temperature outside the heating zone (3) is not sufficiently high, the bulb (12) and therefore the bulb (8) do not expand, the spring (10) forces the element (7) to the left. which forces the plunger (4) to the left regardless of the pressure in the accumulator (1), thereby promoting the entry of cold water from the network (22) into the system.

2. When the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (12) and consequently the bulb (8) swell against the action of the spring (10), and the element (7) is forced to move to the right. Under these conditions, if the accumulator (1) is not fully charged, the spring (5) forces the plunger (4) to the left, thereby opening the cold water inlet of the network (22) into the system.

3. When the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (12) and consequently the bulb (8) swell against the action of the spring (10), and the element (7) is forced to move to the right. Under these conditions, if the accumulator is fully charged, the pressure of the accumulator causes the piston (4) to move to the right against the action of the spring (5), thereby promoting the closing of the cold water inlet ( 22) in the system. Under these conditions, as the accumulator (1) is charged, the water contained in the accumulator (1) is routed to the inlet of the heating zone (3), passing this water through the non-return valve (2). This is the phase of using the accumulated pressure water in the accumulator (1).

There are no conditions where the water from the accumulator (1) is feeding the inlet of the heating zone (3), and the water leaving the heating zone (3) is directed to the accumulator (1), because due to the existence The pressure drop associated with water runoff never returns to its original place of origin unless power is supplied to it, which is not the case.

As described, the system operates without human intervention, operating automatically based on the assessment of temperature and pressure values at some points of the system to achieve the desired water saving function.

As described, the proposed system does not require any additional power source, electrical, mechanical or otherwise, operating solely on the basis of temperature and pressure values at some points of the system in operation.

The capacity of the accumulator (1) of the proposed system is dictated by the volume of water that, in the absence of the proposed system, would be expelled by the water heater or the hot water boiler but not in the desired temperature conditions and would be released. in the sewer.

Detailed Description of the Invention

Referring to Figs. 1 and 1b, the preferred embodiment of the invention will now be described, in which the essential elements that make up the proposed system are represented.

The temperature sensing elements, which evaluate the temperature of the water stream leaving the heating zone (3), are the expansion bulbs (12) and (13). The expandable bulb (13) exerts its action directly on the stem (14), while the expandable bulb (12) communicates its expansion to the expandable bulb (8) through the transfer channel (11), the expandable bulb exerting (8) its action directly on the stem (9).

The water selector system (25) acts as follows: When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is not fully charged with water and the outlet (23) It is open so that the pressure exerted by the water from the outlet (23) on the piston (19) does not cause it to close the passage to the accumulator (1), the assembly being formed by the pistons (15) and (17). and by the rod (16) displaced to the left by the action of the spring (18), the water leaving the heating zone (3) is directed to the accumulator (1). This is the phase in which water is accumulating that would otherwise be discharged into the sewage as it does not meet the temperature conditions required by users.

When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is not fully charged with water, and the outlet (23) is closed, meaning no water demand by the user, so that the pressure exerted by the water seeking the outlet (23) on the plunger (19) causes it to close the passage to the accumulator (1), there is no water outlet through the outlet (23). ) and there is no water flow to the accumulator (1), so there is no water flowing from the heating zone (3).

When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is fully charged with water, and the outlet (23) is open so that the pressure exerted by the water from the outlet (23) on the plunger (19) does not cause it to close the passage to the accumulator (1), cold or partially cold water leaving the heating zone (3) is not directed to the accumulator (1) but outlet (23) as the pressure in the accumulator acts on the piston (17) and forces it to move to the right, as does the perforated piston (15), thus

leaving free the passage of Water leaving the zone in heating (3) to the exit (23). In this conditions, The temperature gives water at the outlet (23) may be inferior The

intended by the users, but in this situation the accumulator (1) is already fully charged with water and does not allow more water to accumulate inside it.

When the water temperature outside the heating zone (3) is not sufficiently high, the accumulator (1) is fully charged with water and the outlet (23) is closed, meaning no hot water is required. by the users, so that the pressure exerted by the water from the outlet (23) on the piston (19) causes it to close the passage to the accumulator (1), there is no water outlet through the outlet (23) and there is no water flow to the accumulator (1), so there is no water flowing from the heating zone (3).

When the temperature of the water leaving the heating zone (3) is sufficiently high, the expandable bulb (13) moves the rod (14) to the right and pushes the perforated plunger (15) to the right to leave The passage of water from the heating zone (3) towards the outlet (23) through the space to the left of the perforated piston (15) is available. If the outlet (23) is open, water from the heating zone (3) proceeds to the outlet (23) and thereafter for the intended uses. This corresponds to the normal use of the water heater or hot water boiler incorporating the proposed system.

When the temperature of the water leaving the heating zone (3) is sufficiently high, the expandable bulb (13) moves the rod (14) to the right and pushes the perforated plunger (15) to the right to leave The passage of water from the heating zone (3) towards the outlet (23) is available. If the outlet (23) is closed, there is no water flowing from the heating zone (3) to the outlet (23), and in this case there is also no water to the accumulator as the pressure at the outlet (23) is such that the piston (19) closes a possible passage of water from the outlet of the heating zone (3) to the accumulator (1).

The subsystem consisting of the piston (19) and the spring (20) acts to prevent water from leaving the heating zone (3) to the accumulator (1) if the outlet (23) is closed, and allowing water to flow from the heating zone outlet (3) to the accumulator (1) if the outlet (23) is open.

The non-return valve (21) ensures that the use of water accumulated in the reservoir (1) never occurs by direct discharge of water at the exit of the heating zone (3), but necessarily by discharge on the water selector system (24). .

The water selector system (24) acts as follows: When the water temperature outside the heating zone (3) is not sufficiently high, the bulb (12) and therefore the bulb (8) do not dilate, spring (10) forces element (7) to the left which forces piston (4) to the left regardless of the water pressure in the accumulator (1), thereby promoting cold water entering the network (22). ) in the system. Under these conditions it does not make sense for the heating water in the heating zone (3) to come from the storage tank (1), as the water leaving the heating zone (3) is not hot enough to be sent to the storage tank. (1), but due to pressure drops, water does not return to the place of provenance unless power is supplied to it, which is not the case.

When the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (13) and therefore the bulb (8) swell against the action of the spring (10), and the element (7) is forced to move to the right. Under these conditions, if the accumulator is not fully charged, the spring (5) forces the piston (4) to the left, thereby opening the cold water inlet of the network (22) in the system. Under these conditions it makes sense to use cold mains water (22) to power the system as the accumulator is not charged with water.

When the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (13) and therefore the bulb (8) swell against the action of the spring (10), and the element (7) is forced to move to the right. Under these conditions, if the accumulator is fully charged, the pressure of the accumulator causes the piston (4) to move to the right against the action of the spring (5), thereby promoting the closing of the cold water inlet ( 22) in the system. Under these conditions, as the accumulator (1) is charged, the water contained in the accumulator (1) is routed to the inlet of the heating zone (3), passing this water through the non-return valve (2). Under these operating conditions, the pressurized water contained in the accumulator (1) is being used, which was previously sent there when the water leaving the heating zone (3) did not meet the users' temperature requirements, It is therefore under these conditions that water conservation is being advocated under the proposed system.

The check valve (2) prevents cold water from the mains (22) from being routed directly to the accumulator (1), and the water that is eventually to be directed to the accumulator is only the water leaving the area. (3) which is not in the required temperature conditions.

The system operates without human intervention, operating automatically based on the assessment of temperature and pressure values at some points in the system. The temperatures thus evaluated trigger actions on the expansion bulbs (12), (8) and (13). In turn, the pressures thus evaluated trigger actions on the pistons (4), (17) and (19).

The proposed system does not require any additional power source, electrical, mechanical or otherwise, operating solely on the basis of temperature and pressure values at some points of the system in operation.

The capacity of the accumulator (1) of the proposed system is dictated by the volume of cold or partially cold water which, in the absence of the proposed system, would be expelled by the hot water boiler or boiler but not in the desired temperature conditions, and which would therefore be subsequently sent to the sewer.

The proposed system can be implemented smoothly in new water heaters or boilers or pre-existing water heaters, where water can be heated by burning fuels, using hot gases, or by means of electrical resistors. In the case of implementing the system in pre-existing water heaters or boilers, simply replace the cold water inlet on the water heater or boiler with the water selector system (24) and the water outlet of the water heater or boiler by water selector system (25).

Lisbon, 9th December 2009

Claims (17)

1. Water-saving system for use in water heaters or hot-water boilers comprising a pressurized water storage tank and two water selector systems, comprising: - a water selector system (24) which assesses the temperature of the water leaving the heating zone (3) of the water heater or boiler and the pressure of the accumulator (1) by means of the expansion bulbs (12 and 8) connected between by the signal transfer channel (11) which opens the cold water inlet of the network (22) if the water at the outlet of the heating zone (3) is not hot enough or if the pressure of the accumulator (1) indicates that it is not fully charged, and when the water at the outlet of the heating zone (3) is sufficiently hot and if the pressure of the accumulator (1) indicates that it is fully charged, the water selector system (24) acts to close entering cold water from the mains (22) and allowing pressurized water in the accumulator (1) to be led into the heating zone (3) of the water heater or hot water boiler; - a water selector system (25) which evaluates the temperature of the water leaving the heating zone (3) of the water heater or boiler, as well as the pressure of the accumulator (1) through the expansion bulb (13) which directs the water to the outlet (23) of the water heater or boiler if the outlet temperature is equal to or above the desired value, or forwards the water to the accumulator (1) if the pressure of the accumulator (1) indicates that it is not present. loaded with water. System according to claim 1, characterized in 2 . the water selector system (24) comprises the swelling bulb (8), the plunger (4), the spring (5), the perforated disc (6), the stem (9), the spring (10), the mechanical connecting element (7), and the non-return valve (2), wherein the expansion bulb (8), installed in the water selector system (24), is fed by the signal emitted by the expansion bulb (12), which is installed in the water selector system (25). System according to Claim 1, characterized in that the water selector system (25) comprises the expansion bulb (13), the rod (14) which moves to the right when the expansion bulb (13) expands, perforated piston (15), piston (17), rod (16) connecting pistons (15) and (17), and spring (18), wherein the water selector system (25) further comprises the device outlet pressure sensor (23) consisting of the piston (19), spring (20) and non-return valve (21), and the expandable bulb (12) installed in the water selector system (25) to be its action on the expandable bulb (8) of the water selector system (24), the signal of the bulb (12) being transmitted through the transfer channel (11) in order to exert its action on the expandable bulb (8). System according to the preceding claim, characterized in that the bulb (12) transmits a signal through the transfer channel (11) in the form of an increase or decrease in the volume of the fluid contained in the expandable bulb, which fluid it also fills the transfer channel (11), which is reflected in the form of an increase or decrease in volume, respectively, in the expandable bulb (8). System according to the preceding claims, characterized in that the cold or partially cold water flowing from the heating zone (3) is directed to the accumulator (1) provided that it is not fully charged and capable of accumulating such cold water or Partly cold. System according to one of the preceding claims, characterized in that it operates automatically, depending on the temperatures and pressures at certain points in the system, and does not require any further intervention by the hot water operator / user. System according to the preceding claims, characterized in that it does not require any additional source of energy, electrical, mechanical or otherwise, operating solely on the basis of temperature and pressure values at some points of the system in operation. System according to Claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is not sufficiently high, the accumulator (1) is not completely loaded with water, and the exit (23) if find open so that the pressure exerted by the water Check-out (23) over the plunger (19) does not lead you to close the ticket to O accumulator (1 ), make the water that leave the zone in heating (3) is forwarded to the accumulator (1) 9. System in a deal with the claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is not sufficiently high, the accumulator (1) is not fully charged with water, and the outlet (23) closed, meaning that there are no hot water requests from users, so that the pressure exerted by the water seeking the outlet (23) on the piston (19) causes it to close the passage to the accumulator (1). ), there is no water coming out of the outlet (23) as well as no water passing to the accumulator (1), which means that no water flows from the heating zone (3). System according to Claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is not sufficiently high, the accumulator (1) is completely charged with water, and the outlet (23) is open so that the pressure exerted by the water from the outlet (23) on the plunger (19) does not close the passage to the accumulator (1), causing the cold water or partially cold leaving the heating zone (3) is not directed to the accumulator (1) but to the outlet (23), where the pressure in the accumulator acts on the piston (17) and forces it to move. to the right, as is the perforated plunger (15), as well as the leaving free the passage of Water leaving the zone in heating (3) to the exit (23), in this conditions, The temperature of water in exit (23) may be inferior The intended by the users, but in this situation the accumulator (1) is already fully charged with water and does not allow more water to accumulate inside it. System according to Claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is not sufficiently high, the accumulator (1) is completely charged with water, and the outlet (23) is closed, meaning that there are no hot water requests from the users, so that the pressure exerted by the water seeking the outlet (23) on the piston (19) causes it to close the passage to the accumulator (1), and to make sure that there is no water outflow from the outlet (23) as well as a passage of water to the accumulator (1), so that there is no water flowing from the area. heating (3). System according to Claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is sufficiently high, the expansion bulb (13) moves the stem (14) to the right, and it pushes the perforated plunger (15) to the right to allow water to flow from the heating zone (3) towards the outlet (23) and if the outlet (23) is open the hot water from the heating zone (3) to the outlet (23) and then to the intended use. System according to Claims 1 to 4, characterized in that the water selector system (25), when the temperature of the water leaving the heating zone (3) is sufficiently high, the expansion bulb (13) moves the stem (14) to the right, and it pushes the perforated plunger (15) to the right to allow water to flow from the heating zone (3) towards the outlet (23) and if the outlet (23) is when closed, there is no water flowing from the heating zone (3) to the outlet (23), and in this case there is also no water to the accumulator since the pressure at the outlet (23) is such that the piston (19) closes any hot water from the heating zone (3) to the accumulator (1). System according to Claims 1 to 4, characterized in that the water selector system (24) provides cold water to the system (22) when the temperature of the water leaving the heating zone (3) the bulb (12) and consequently the bulb (8) do not swell, the spring (10) forces the element (7) to the left which forces the piston (4) to the left regardless of pressure in the accumulator (1). System according to Claims 1 to 4, characterized in that the water selector system (24) promotes the opening of the cold water inlet of the network (22) in the system when the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (12) and consequently the bulb (8) expand against the action of the spring (10), and the element (7) is forced to move to the right, and under these conditions, If the accumulator (1) is not fully charged, the spring (5) forces the plunger (4) to the left. System according to Claims 1 to 4, characterized in that the water selector system (24), when the temperature of the water leaving the heating zone (3) is sufficiently high, the bulb (12) and consequently the bulb. (8) swell against the action of the spring (10), and the element (7) is forced to move to the right under these conditions if the accumulator is fully charged the pressure of the accumulator forces the piston (4) moving to the right against the action of the spring (5), thereby closing the cold water inlet of the network (22) in the system, and causing the accumulator (1) to direct the water contained therein to the inlet of the heating zone (3), passing this water through the non-return valve (2) thus promoting the use of the accumulated pressure water in the accumulator (1). Water heater comprising the water saving system according to claim 1. Boiler characterized in that it comprises the water saving system according to claim 1.