JP5786135B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump hot water heating apparatus capable of heating by heating a heat medium such as water or antifreeze.

  Conventionally, this type of heat pump hot water heating device has a compressor, a water refrigerant heat exchanger, a decompression means, and a refrigeration circuit in which an evaporator, which is an evaporator, is connected in an annular shape, and receives heat from the refrigerant circuit to exchange heat. A water-refrigerant heat exchanger that heats a heat medium such as low-temperature water or antifreeze liquid using hot water, and a heat medium such as water or antifreeze liquid heated by this water-refrigerant heat exchanger And a cistern tank for storing a heating medium such as heated water or antifreeze. The cistern tank and the circulation pump are mounted on a heat pump device.

  FIG. 11 shows a top view and a front view of a conventional heat pump hot water heating device 00. The top view is a replenishment of a heat medium such as water or antifreeze and a buffer for a heat medium such as expanded water or antifreeze. A cistern tank 101 serving as a role and a circulation pump 102 for supplying hot water to an external radiator (floor heating, fan convector, etc.) installed at a remote location are provided, and the outer periphery 103 covers them all around, and a heat pump device 104 Is placed above the upper and lower partitions by the upper and lower partition plates 105.

  Similarly, the heat medium return port 106 and the heat medium return port 107 having a plurality of connection ports for connecting an external radiator and piping are also above the horizontal partition plate 105, and the plurality of connection ports are in the horizontal direction and rearward. It is arranged facing. Further, a pipe cover 108 for storing a power supply line or the like is provided on the right side of the heat pump device 104 (see, for example, Patent Document 1).

JP 2010-144986 A

  However, in the configuration of Patent Document 1, the cistern tank 101 that stores water and the circulation pump 102 that conveys water are located above the heat pump device when water expanded from the cistern tank 101 overflows and leaks, or When leaking from the piping junction of the circulation pump 102, the heat flows into the heat pump device 100 and may enter the heat pump device 100.

  In order to prevent this, it is necessary to take measures such as installing a weir around the cistern tank 101 above the heat pump device. However, this increases the number of parts, which in turn leads to an increase in cost. Have.

  This invention solves the said subject, and it aims at providing the heat pump hot water heating apparatus which implement | achieved the improvement of usability at low cost.

In order to solve the conventional problems, a heat pump hot water heating apparatus of the present invention is heated by a refrigerant circuit connected to a compressor, a water refrigerant heat exchanger, a decompressor, and an evaporator, and the water refrigerant heat exchanger. A circulating pump that circulates the heated heat medium to an external radiator, an exterior body that has a rear exterior body that protrudes outward, and in which the water-refrigerant heat exchanger is installed, and the exterior body and the external radiator A heat medium return port connected by piping, a heat medium return port, and a cistern tank for storing the heat medium, and the heat medium return port and the heat medium return port are disposed on the side of the exterior body. In addition, the cistern tank and the circulation pump are disposed in the rear exterior body, and the bottom portion of the rear exterior body is configured to be substantially at the same position as the upper portion of the water refrigerant heat exchanger. It is what.

  As a result, it is possible to secure and route a space for routing the heat medium pipes with a maximum of 4 connections (eight) directly under the rear exterior body, and the heat medium pipes are routed to the left of the heat pump hot water heater. At the same time, the vertical movement of the heat medium pipe is regulated at the bottom of the rear exterior body, and the heat medium pipe of the evaporator is accommodated near the height of the water-refrigerant heat exchanger disposed in the exterior body. Ventilation obstruction due to airflow can be prevented and performance degradation can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the heat pump hot water heating apparatus which implement | achieved the improvement of usability at low cost can be provided.

The refrigerant circuit and water circuit diagram of the heat pump hot water heating device in Embodiment 1 of the present invention Front internal perspective view of the heat pump hot water heater Rear internal perspective view of the heat pump hot water heater External perspective view of the heat pump hot water heater Rear external perspective view of the heat pump hot water heater Fixing bracket mounting configuration diagram of the heat pump hot water heater Right side view of the heat pump hot water heater Detailed perspective view of the outer box of the heat pump hot water heater Detailed perspective view of fixing bracket of the heat pump hot water heater Construction drawing of the heat pump hot water heater Piping construction perspective view of the heat pump hot water heater (A) Interior view of a conventional heat pump hot water heater (b) Front view of a conventional heat pump hot water heater (A) Perspective view of main part of air-conditioning air conditioner with hot water heating function provided with conventional radiator (b) Front view of air-conditioning air conditioner with hot water heating function equipped with conventional radiator

  A first invention is a refrigerant circuit in which a compressor, a water refrigerant heat exchanger, a decompressor, and an evaporator are connected, and a circulation pump that circulates a heat medium heated by the water refrigerant heat exchanger to an external radiator. And an exterior body having a rear exterior body projecting outward and having the water-refrigerant heat exchanger installed therein, a heating medium return port for connecting the exterior body and the external radiator with a pipe, and a heating medium return port And a cistern tank that stores the heat medium, the heat medium return port and the heat medium return port are disposed on the side of the exterior body, and the cistern tank in the rear exterior body, The heat pump hot water heater is characterized in that a circulation pump is disposed and a bottom portion of the rear exterior body is arranged at substantially the same position as an upper portion of the water-refrigerant heat exchanger.

As a result, it is possible to secure and route a space for routing the heat medium pipes with a maximum of 4 connections (eight) directly under the rear exterior body, and the heat medium pipes are routed to the left of the heat pump hot water heater. At the same time, the vertical movement of the heat medium pipe is regulated at the bottom of the rear exterior body, and the heat medium pipe of the evaporator is accommodated near the height of the water-refrigerant heat exchanger disposed in the exterior body. Ventilation obstruction due to airflow can be prevented and performance degradation can be prevented.

  The second invention is characterized in that the water supply port of the sister tank disposed in the rear exterior body is configured to protrude from the rear exterior body, and it is easy to remove and remove the exterior body. Water supply work can be performed and maintainability can be improved.

  Also, in the unlikely event that water overflows during the water supply operation, since the exterior body is covered except for the water supply port, water can be prevented from entering the device and safety can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigerant circuit and water circuit diagram of a heat pump hot water heating apparatus according to a first embodiment of the present invention.

  Reference numeral 1 denotes an outdoor unit of a heat pump hot water heating apparatus for heating a circulating heat medium such as water or antifreeze, and 2 denotes an external radiator connected to the outdoor unit 1 of the heat pump hot water heating apparatus by a heat medium pipe 3. In the figure, a panel-like external radiator such as floor heating is used. However, a panel heater or a fan convector equipped with a blower fan may be used.

  The hot water generated by the outdoor unit 1 passes through the heat medium pipe 3 and is sent to the external radiator 2 to heat the living room where the external radiator 2 is installed. Is the heat source.

  The components incorporated in the outdoor unit 1 of this heat pump heat source unit are as follows.

  The heat pump hot water heating device includes a compressor 4 that compresses and circulates a refrigerant, a water refrigerant heat exchanger 5 that is composed of a copper tube having high thermal conductivity and performs heat exchange between the heat medium such as water or antifreeze and the refrigerant, There is an expansion valve 6 as a decompression means and an evaporator 7 as an air refrigerant heat exchanger, and a closed circuit is formed by sequentially connecting the compressor 4, the water refrigerant heat exchanger 5, the decompression means 6 and the evaporator 7 in an annular shape. Thus, a refrigerant circuit 8 for circulating the refrigerant is configured.

  The water-refrigerant heat exchanger 5 is composed of a copper pipe, and is a double-pipe structure heat exchanger in which the refrigerant pipe 5a is arranged on the outside and the water pipe 5b is arranged on the inside, and the refrigerant circulates outside. The heat medium such as water or antifreeze liquid is circulated in the direction opposite to the flow of the refrigerant to exchange heat and heat the heat medium such as water or antifreeze liquid.

  Reference numeral 9 denotes a blower fan that conveys air to the evaporator 7 that is an evaporator, and promotes the heat exchange capability of the evaporator 7.

  10 is a condensing temperature sensor brazed to the water refrigerant heat exchanger 5 in the refrigerant circuit 8, 11 is a compressor outlet temperature sensor provided in the compressor discharge pipe 12 of the compressor 4, and 13 is It is an air heat exchange outlet temperature sensor provided in the air heat exchange outlet pipe 14 of the evaporator 7.

  On the other hand, the hot water circuit 15 circulates a heat medium such as water or an antifreeze liquid in the water refrigerant heat exchanger 5 to exchange heat with the refrigerant. Reference numeral 16 denotes a circulation pump that forcibly circulates a heat medium such as water or antifreeze in the hot water circuit 15, and is disposed upstream of the water-refrigerant heat exchanger 5.

  Reference numeral 17 denotes a cistern tank that serves as a replenishment of a heat medium such as water or antifreeze disposed upstream of the circulation pump 16 and a buffer for the heat medium such as expanded water or antifreeze. A cap 18 that opens to replenish a heat medium such as water or antifreeze, and a water level sensor 19 that detects the water level in the cistern tank 17 are provided.

  Reference numeral 20 denotes a thermal valve provided at the distal end of the warm water circuit 15 for sending warm water heated by the water-refrigerant heat exchanger 5 to the external radiator 2. Accordingly, opening and closing operations are performed, and control is performed so that hot water is supplied only to the necessary external radiator 2.

  Reference numeral 21 denotes a heat medium forward port integrated with the thermal valve provided at the end of the heat valve 20, and the heat medium pipe 3 is connected to the heat medium forward port 21. When all the external radiators 2 are not used, the thermal valve 20 is closed. In the drawing, four thermal valves 20 are provided, but this may be one or may be a plurality of four or more.

  22 is a forward header pipe connecting the hot water circuit 15 integrated with the thermal valve and the thermal valve 20, and one place of the hot water circuit 15 is moved to a plurality of locations according to the quantity of the thermal valve 20. Branch off.

  Reference numeral 23 denotes a heat medium return port that is radiated by the external heat radiator 2 and returns to the hot water circuit 15 when the hot water whose temperature has been reduced. The number of heat medium return ports is the same as that of the heat valve 20. In FIG. 1, there are four locations.

  The heating medium return port 23 has a return header 24 that joins the hot water returned from the plurality of external radiators to the hot water circuit 15 inside the device.

  25 is a water refrigerant heat exchanger inlet temperature sensor that measures the temperature of hot water entering the water refrigerant heat exchanger 5, and 26 is a temperature of a heat medium such as water or antifreeze liquid on the outlet side of the water refrigerant heat exchanger 5. This is a water refrigerant heat exchanger outlet temperature sensor.

  27 is an electronic control device that controls various actuators and sensors of the heat pump hot water heating device, and 28 is a remote controller that operates the device and performs various settings.

  A heat pump hot water heating apparatus in which the components shown in the refrigerant circuit and the hot water circuit diagram of the heat pump hot water heating apparatus of FIG. 1 are laid out will be described with reference to FIGS. 2, 3, and 4.

  There is a substrate 29 at the lowermost part of the heat pump hot water heating apparatus, the refrigerant circuit 8 in which the compressor 4 and the expansion valve 6 which is a decompression means are connected in an annular shape with a refrigerant pipe across the soundproof plate 34 at the upper part of the substrate; On the other hand, a blower circuit including the evaporator 7, a blower fan 9 that promotes heat exchange between air and refrigerant, and a motor 32 that drives the blower fan 9 is formed.

  The water-refrigerant heat exchanger 5 is a heat exchanger having a double tube structure in which a refrigerant tube 5a is disposed outside and a water tube 5b disposed inside, and a double tube formed in a spiral shape is laminated. (The number of stacked layers is not particularly limited.) The flow of fluid in the double pipe is a counter flow between a refrigerant and water or antifreeze, and performs heat exchange.

  The refrigerant pipe 5 a constituting the water refrigerant heat exchanger 5 forms part of the refrigerant circuit 8, and high-temperature refrigerant generated by the compressor 4 is connected to the water refrigerant heat exchanger 5 through the discharge pipe 12. Heat exchange with water or antifreeze to produce hot water.

On the other hand, the water circulating through the water pipe 5b is heated from the lowermost layer of the stacked double pipes to the upper part.
The heat medium pipe connecting the water refrigerant heat exchanger 5 and the heat valve 20 or the heat medium return port 23 passes through the front surface of the compressor 4.

  As shown in FIG. 2, the water refrigerant heat exchanger 5 is covered with a heat insulating material upper 30 a and a heat insulating material lower 30 b such as polystyrene foam in order to improve heat insulation, and the heat insulating material lower 30 b is a plane of the substrate 29. It is installed on the substrate 29 so as to engage with the concavo-convex shape.

  Further, the water / refrigerant heat exchanger 5 housed in the heat insulating materials 30a and 30b is covered on the front, rear, left, and right upper surfaces by a cover 31 whose upper portion is located at a height of 123 mm from the bottom of the substrate 29 (in FIG. 4, The radiator heat insulating materials 30a and 30b and a part of the cover body 31 are cut so that the water-refrigerant heat exchanger 5 can be seen, but it is not actually cut in this way.

  A blower fan 9 and a blower motor 32 that drives the blower fan 9 are held by a motor base 33 at the top of the water-refrigerant heat exchanger 5, and the motor base 33 is fixed to the upper surface of the cover body 31. ing. An evaporator 7 which is an L-shaped evaporator is installed on the substrate 29 on the back surface thereof, and the air is forced to pass through the blower fan 9 to promote heat exchange between the air and the refrigerant. It has become.

  The electronic control device 27 is disposed on the top of the soundproof plate 34, and a power line connection terminal 35a and a remote control connection terminal 35b are taken out from the electronic control device 27 on the right side.

  As mentioned above, the various components described so far are accommodated in the exterior body 36 of the outdoor unit 1 of the heat pump hot water heater. As shown in the external perspective view of FIG. 4, the exterior body 36 includes a front plate 37 that covers the front, a right plate 38 that covers the right side and the right rear, and a left plate 39 that covers the left side, which are attached to the substrate 29. There is a top plate 40 that is placed on the front plate 37, the right side plate 38, and the left side plate 39 and covers the upper side. Further, a pipe cover 53 is attached to the right side plate 28 side.

  2 and 3, the thermal valve 20 and the heat medium return port 23 are mounted in parallel to each other on a mounting bracket 41 disposed adjacent to the outside of the right side plate 38 that forms the right side of the exterior body 36. ing.

  At this time, the heat valve and the heat medium return port projecting to the right side of the exterior body 36 are configured so that the periphery is covered with the mounting bracket 41 and the cover 42 except for the pipe connection port.

  Further, a pipe cover 53 is arranged on the outer periphery thereof to prevent water from entering the heat valve 20 and the heat medium return port 23 fixed to the power line connection terminal 35a, the remote control connection terminal 35b, and the mounting bracket 41 from the outside. .

  Reference numeral 22 denotes a forward header pipe connected to the thermal valve 20. The thermal header pipe 43 connects the forward header pipe 22 and the water pipe 5 b of the water-refrigerant heat exchanger 5. In addition, a water / refrigerant heat exchanger outlet temperature sensor 26 is attached to the heat valve piping 43.

  Reference numeral 17 denotes a cistern tank disposed on the back side of the right side plate 38 of the exterior body 36. A return port heat medium pipe 44 connected to a return header pipe 24 integrated with the heat medium return port 23 is connected to the lower surface of the cistern tank 17. A heat medium such as water or antifreeze is led to the cistern tank 17.

Further, a cap 18 for replenishing a heat medium such as water or an antifreeze is provided above the cistern tank 17, and a part of the cap 18 is notched so that the increased pressure in the cistern tank 17 can be released.

  Further, when a heat medium such as water or antifreeze liquid exceeding the specified amount is put into the cistern tank 17, the heat medium such as water or antifreeze liquid expanded from the cap 18 overflows, and the heat medium is allowed to escape to the outside. .

  Reference numeral 19 denotes a water level sensor provided in the cistern tank 17, which detects the water level in the cistern tank 17 and notifies the user of a warning when the water level drops, and displays it on the remote controller 28, so that water or antifreeze can be obtained. Encourage the user to replenish the heating medium.

  The circulation pump 16 is mounted directly below the cistern tank 17 and is disposed at a position protruding rearward from the rear side of the refrigerant circuit side of the exterior body 36 in the same manner as the cistern tank 17.

  The circulation pump 16 operates so that the hot water is circulated in the hot water circuit 15 forcibly. The circulation pump 16 is connected to a pipe b of the water refrigerant heat exchanger 5 by a pump outlet pipe 46, and the pump outlet pipe 46 measures water refrigerant heat for measuring the temperature of hot water entering the water refrigerant heat exchanger 5. An exchanger inlet temperature sensor 25 is attached.

  FIG. 5 is an external perspective view of the heat pump hot water heating apparatus showing the configuration of the rear exterior body 47 provided on the back surface of the exterior body 36. The circulation pump 16 and the cistern tank 17 are disposed inside a rear exterior body 47 protruding in a convex shape behind the right side plate 38 on the refrigerant circuit side rear surface of the exterior body 36, and the periphery thereof is covered by the rear exterior body 47. It has been broken.

  The rear exterior body 47 includes a bottom plate 48 that constitutes a lower portion of the rear exterior body 47, an outer box 49 that covers the periphery of the exterior body, and a top plate 50 that covers the upper surface.

  As shown in FIG. 6, the bottom plate 48 constituting the rear exterior body 47 is fastened and fixed with screws to the back surface side of the right side plate 38 forming the back surface of the exterior body 36 and the outer surface of the right side surface, and circulates in the upper part thereof. A pump 16 and a cistern tank 17 are arranged in a column.

  Further, fixing plates 51 and 52 for fastening and fixing the outer box 49 of the rear exterior body 47 are attached to the back side of the right side plate 38.

At this time, as shown in FIG. 7, the bottom plate 48 is fastened and fixed to the right side plate 38 at a position 111 mm above the leg of the base plate 29 corresponding to the lowermost surface of the exterior body 36. Subsequently, the outer case 49 and the top plate 50 are attached to the rear plate 48. An exterior body 47 is configured. In addition, the water / refrigerant heat exchanger 5 housed in the heat insulating materials 30a and 30b is covered with front and rear, right and left upper surfaces by a cover 31 whose upper portion is positioned 123 mm from the bottom of the substrate 29. As shown in FIG. 8, a bent surface 49 a is formed on the surface forming the evaporator 7 side of the box 49 toward the inside of the rear exterior body 47.

  On the other hand, as shown in FIG. 9, the fixed plate 52 is also provided with a bent surface 52a opposite to the outer box bent 49a, and the gap A between the fixed plate 52 and the bent surface 52a is the outer box bent surface 49a. When the outer box 49 is set from the upper part, and the outer box folding surface 49a is set to have a gap dimension A secured between the fixed plate 52 and the folding surface 52a. It is set and fixed at a predetermined position along.

The other fixing plate 51 is fastened and fixed to the outer box 49 with screws and covers the periphery of the rear exterior body 47. Further, the top plate 50 provided with a throttle shape 50a toward the right side of the main body and the periphery of the exposed cap 18 forming the upper surface of the rear exterior body 47 is set, and the water supply port of the cistern tank 17 is exposed to the outside as shown in FIG. A rear exterior body 47 is formed.

  The enforcement figure which connected the heat-medium piping 3 to the outdoor unit 1 of a heat pump hot water heating apparatus with the structure mentioned above is FIG.

  Normally, this type of unit uses a block 54 to appropriately treat the condensed water generated by heat exchange in the unit as drain water outside the equipment, and installs a heat pump hot water heating device above it, The construction state in which the distance between the heat pump hot water heater and the bottom of the heat pump hot water heater is 100 mm or more is common. The block 54 is generally commercially available and is made of concrete or resin.

  Reference numeral 3 denotes a heat medium pipe attached to the heat medium forward port 21 and the heat medium return port 23. The heat medium pipe is a crosslinked PE pipe inside, and a heat insulating material is provided as a covering material on the outside. Is provided. As the diameter of the crosslinked polyethylene pipe, φ10 is mainly used.

  And this heat-medium piping 3 is connected with the external radiator 2, and the heat medium such as water or antifreeze liquid heated by the outdoor unit 1 of the heat pump hot water heating apparatus is supplied from the heat-medium delivery port 21 to the heat-medium delivery piping 3a. The heat medium such as water or antifreeze liquid, which has been cooled by heat exchange therethrough, passes through the heat medium return pipe 3b and returns to the heat medium return port 23. Then, it is heated again in the outdoor unit 1 of the heat pump hot water heater, and this operation is repeated.

  The heating medium piping 3 is routed by drawing the heating medium piping 3 to the left passing through the back of the evaporator 7, and conversely, drawing it to the right when viewed from the front of the main body, and drawing it straight to the house as it is. However, in this figure, an example of construction by left-handed drawing that shows the influence on the performance degradation of the equipment and the most difficult workability is shown (there is also construction using a stand).

  About the heat pump hot water heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, a rear exterior body 47 formed in a convex shape is provided on the back surface of the exterior body 36 on the refrigerant circuit side, and the mounting position of the bottom plate 48 that constitutes the bottom of the rear exterior body 47 is set on the substrate 29 that is the installation surface of the exterior body 36. By securing 111 mm or more from the leg portion, a space corresponding to a projection area when the rear exterior body 47 is viewed from above is secured at the lower portion of the rear exterior body 47.

  In addition, a height dimension of 221 mm or more from the installation surface (ground) to the bottom of the rear exterior body 47 can be secured by adding up the height of 100 mm of the block 54 generally used at the time of construction.

  By securing this height dimension, as shown in FIG. 10 and FIG. 11, when the left side of the heating medium pipe 3 is passed through the back of the evaporator 7, bending is performed within a range that does not hinder long-term durability. Piping construction space can be secured.

  As described above, in the present embodiment, the positional relationship between the leg portion of the substrate 29, which is the installation surface of the exterior body 36 of the outdoor unit 1 of the heat pump hot water heater, the bottom of the rear exterior body, and the upper portion of the water refrigerant heat exchanger. By securing the space quantitatively, in the construction state, the heat transfer valve connected in parallel with the mounting plate on the right side of the exterior body and the heating medium piping connected to the heating medium return port, and evaporation The ventilation path in the vessel can be secured.

  At the same time, it is possible to prevent airflow obstruction caused by the heat medium pipe when the heat medium pipe is installed on the evaporator side, and to prevent a decrease in performance.

  In addition, the top plate is placed on the top plate by providing a bent surface on the outer box and the fixture for fixing the outer box that configure the left and right and rear directions of the rear exterior body that forms the convex portion of the present embodiment. When setting more, the folding surface constructed from the surface forming the evaporator side of the outer box toward the inside, the outer box to the predetermined position along the gap formed between the fixture and the folding surface Since it is guided and fixed at the same time, the work of removing the screw from the evaporator side can be abolished, injury due to the fins of the evaporator can be prevented, and safety during maintenance can be ensured.

  In addition, the water supply port of the sister tank built in the rear exterior body forming the convex portion of the present embodiment is configured to be exposed on the upper part of the rear exterior body, without removing the exterior body, Water supply work can be performed easily and maintainability can be improved.

  In addition, the top plate constituting the upper part of the rear exterior body that forms the convex portion of the present embodiment is provided with a throttle shape toward the periphery of the exposed water supply port and the right side surface of the main body, so that water overflowing during water supply work or The flow path of the antifreeze liquid can be regulated so as to be discharged in the right direction of the main body by the throttle shape, and damage to the outdoor wall of the house located on the back surface of the heat pump hot water heating apparatus can be prevented.

  As described above, the heat pump hot water heating apparatus according to the present invention improves performance and prevents deterioration of performance during installation, and at the same time improves maintenance work. Therefore, the equipment has a built-in hot water circuit and refrigerant circuit. It can also be applied to uses such as a water heater or a heating device.

DESCRIPTION OF SYMBOLS 1 Outdoor unit of heat pump hot water heating apparatus 2 External radiator 3 Heat medium piping 4 Compressor 5 Water refrigerant heat exchanger 7 Evaporator 8 Refrigerant circuit 15 Hot water circuit 16 Circulating pump 17 Systurn tank 21 Heat medium return port 23 Heat medium return port 36 exterior body 47 rear exterior body 53 piping cover

Claims (2)

A refrigerant circuit connecting a compressor, a water refrigerant heat exchanger, a decompressor, and an evaporator, a circulation pump that circulates a heat medium heated by the water refrigerant heat exchanger to an external radiator, and a protruding outward An exterior body having the rear exterior body and the water-refrigerant heat exchanger installed therein, a heat medium forward port for connecting the exterior body and the external radiator by piping, a heat medium return port, and the heat medium. A hot water storage cistern tank, the heat medium outlet port and the heat medium return port are disposed on the side of the exterior body, and the cistern tank and the circulation pump are disposed in the rear exterior body. In addition, the heat pump hot water heating apparatus is configured such that a bottom portion of the rear exterior body is located at substantially the same position as an upper portion of the water refrigerant heat exchanger. The heat pump hot water heating apparatus according to claim 1, wherein a water supply port of a sister tank disposed in the rear exterior body projects from the rear exterior body.