Provided is a heat source device including a control unit (51) which, in response to a predetermined request for heating, sets switching valve (21) to first circulation mode to communicate port (21a) and (21c), whereas to cut off communication between port (21b) and (21c), and performs heating operation by actuating burner (11) and circulation pump (22). In response to a predetermined request for hot water supply, the control unit (51) sets the switching valve (21) to second circulation mode to communicate ports (21b) and (21c), whereas to cut off communication between ports (21a) and (21c), and performs hot water supply operation, by actuating burner (11) and circulation pump (22). A hot water supply stop alarm unit (52) issues a hot water supply stop alarm that urges a user to stop using hot water when the request for heating is continued for a first predetermined time or more.

A heat recovery system arranged to heat water includes at least one heat exchanger (9) arranged to heat water by heat exchange with waste heat. A storage reservoir (11) is arranged to store water heated by the heat exchanger (9). The heat exchanger (9) is switchable between a first mode of operation in which water is circulated by a pump (12) in a circuit that includes the storage reservoir (11) and the heat exchanger (9), and a second mode of operation in which water is circulated by the pump (12) in a circuit that by-passes the heat exchanger (9). Heated water of at least a desired minimum temperature can be supplied to at least one outlet during both the first and second modes of operation.

A control system for a heating system, including a blending valve configured to be connected to a heat source and a heating circuit conduit. The blending valve is configured to mix a heating water supply with the return flow from the heating circuit and supply the mixed water to the heating circuit. The blending valve has a first temperature threshold corresponding to the desired operating temperature of the heating circuit and a second temperature threshold that is substantially lower than the return temperature. An actuator is provided the switches the blending valve to the first temperature threshold to activate the heating circuit and to the second temperature circuit to deactivate the heating circuit. The actuator is connected to the pump and operates the pump when activating the heating circuit.

A hot-water heat pump that is capable of reducing installation costs and installation space and also reducing the heating time of a hot-water route, and a method of controlling the same are provided. The hot-water heat pump (1) is provided with a hot-water-heat-pump main unit (2) that includes a thermal output heat exchanger that absorbs heat from a heat-source route and outputs heat; hot-water route (5 and 6) that receive heat outputted from the thermal output heat exchanger; a three-way valve (4) provided in the outlet-side hot-water route (6); and a controller that controls the hot-water-heat-pump main unit (2) and the three-way valve (4), wherein the controller controls the size of openings of the three-way valve (4) so that a portion of the outlet-side hot-water route (6) leading out of the thermal output heat exchanger is guided to an upstream side of the thermal output heat exchanger.

The present disclosure provides a water heater including a bypass conduit to allow flow of cold water from an inlet pipe to an outlet pipe, and an outlet temperature sensor coupled to the outlet pipe downstream of an outlet of the bypass conduit, to sense temperature of mixture of hot water and cold water in the outlet pipe. An electronic mixing valve is disposed along the inlet pipe to receive temperature data of water mixture from the outlet temperature sensor and compare temperature of the water mixture with a predefined temperature value. In response to determining that the water mixture is flowing through the outlet pipe, the electronic mixing valve regulates the flow of cold water through at least one of the bypass conduit and the inlet pipe until the temperature of the water mixture is within a predetermined range of the predefined temperature value.

Disclosed is a valve including a valve housing having an empty space therein, an opening/closing part provided in the valve housing and configured to be movable in an upward/downward direction H, a shaft part fixedly coupled to the opening/closing part and configured to be movable in the upward/downward direction H together with the opening/closing part, a drive part configured to move the shaft part in the upward/downward direction H, and a seating part protruding inward from an inner surface of the valve housing and configured to interfere with the opening/closing part when the opening/closing part moves in the upward/downward direction H by a predetermined distance.

Temperature control device (1) has a hot water inlet (12), a cold water inlet (14) and an outlet (16) for tempered water. A diffuser (18) is provided in the device (1) to disrupt the flow of hot water after it enters the device (1). The disrupted hot water emerges from the diffuser (18) into a chamber (20) in which it is melded with cold water that is able to enter the chamber (20) from the inlet (14) when a piston (22) is spaced from a seat (24). The melded hot and cold water result in tempered water that is discharged from the outlet (16). A temperature sensitive device (26) is provided, which is responsive to changes in ambient temperature. A temperature setting mechanism (52) is provided which is operatively associated with the temperature sensitive device (26) and permits the maximum temperature of the discharged tempered water to be adjusted.

A system includes: a heat generator obtaining heat from a heat source and having a generator outlet port and a generator return port; a central heating circuit having a heating feed port and a heating return port; a tank having a top portion and a bottom portion, the tank containing a heat storing medium; a first tapping coil immersed in the heat storing medium in the bottom portion of the tank; and a second tapping coil immersed in the heat storing medium in the top portion of the tank The heat generator, second tapping coil, central heating circuit, and first tapping coil are fluidly connected in series to allow fluid to flow from the heat generator via at least one of the second tapping coil, the central heating circuit, and the first tapping coil back to the heat generator The system includes first, second and third three-way valves.