The system includes: a heat pump unit; a hot water supply heat exchanger; heating heat exchangers; a pump; heat medium pipes that connect a discharge side of the pump, the heat pump unit, the hot water supply heat exchanger, the heating heat exchangers, and a suction side of the pump in order; a first bypass pipe that bypasses the hot water supply heat exchanger from the heat medium pipe; a second bypass pipe that bypasses the heating heat exchangers from the heat medium pipe; a four-way valve that regulates flow distribution of the heat medium between the hot water supply heat exchanger and the first bypass pipe 22, and between the heating heat exchangers and the second bypass pipe; and a control unit for controlling the four-way valve in accordance with a hot water supply request and a heating request.

Disclosed a control method for monitoring the efficiency status of the components of the primary circuit of a gas boiler, the components including the pump, the primary exchanger, and the secondary exchanger on the primary side. The method includes a first part method M.dhw suitable to signal that one of the components of the primary circuit is degraded, due to a drop in the flow rate Q circulating in the primary circuit. Said method further envisages a second part method M.hea (or, alternatively, method M.hea.bis), capable of indicating that the component of the primary circuit actually responsible for the degradation is either the secondary exchanger on the primary side or one of the pump and the primary exchanger.

A system produces domestic hot water and heat for central heating and includes: a heat generator for obtaining heat from a heat source, the heat generator having a generator outlet port and a generator return port; a central heating circuit having a heating feed port and a heating return port; and a tank having an inlet port, an upper port and a lower port, the tank containing a fluid which is a heat storing fluid, and the inlet port being configured to feed the heat storing fluid into the tank. The heat generator, the central heating circuit, and the tank are fluidly connected in series to allow the fluid to flow from the heat generator via at least one of the central heating circuit and the tank back to the heat generator The system further includes first, second and third three-way valves.

A valve includes a valve body having a groove and a fluid guiding element, wherein the fluid guiding element defines at least three channels and a cavity for receiving the valve body therewithin, so as to enable the communication among the channels to be adjusted by rotating the valve body.

A valve device includes: a case having a valve chamber and first to third water communication ports communicating with the valve chamber; first and second valve bodies disposed in the valve chamber; and a shaft body connected with the first valve body. The first valve body is rotated about a central axis of the shaft part. The second valve body is rotated about the central axis together with the first valve body. When rotated about the central axis in a first angle region, the first valve body changes a first flow rate, i.e., a flow rate of water between the first and third water communication ports, and a second flow rate, i.e., a flow rate of water between the second and third water communication ports. When the first valve body is rotated about the central axis in a second angle region, the second valve body changes the second flow rate.

In a method for operating a heating system, a heating circuit medium is guided in an overall heating circuit and in first and second sub-heating circuits connected to the overall heating circuit. A heating circuit medium volumetric flow through the sub-heating circuits is defined by a valve device and fed to the second sub-heating circuit via a first valve device connection and/or guided via a second valve device connection. The heating circuit medium volumetric flow is fed via a connection of the valve device connected to the overall heating circuit. If necessary, the heating circuit medium volumetric flow is fed to the first sub-heating circuit via the second connection of the valve device, and if necessary, the heating circuit medium volumetric flow is delivered via a bypass on the second sub-heating circuit. If necessary, the heating circuit volumetric flow is guided through a buffer store at the bypass.

A manifold has a frame and a plurality of valves supported by the frame, each valve having a cross gear that includes four semicircular recesses and four arms that terminate in pointed tips, and wherein the tips are non-jamming rubber tips. The manifold also has a screw drive and a splined rotatable shaft parallel to the screw drive. The manifold further includes a slider driven by the screw drive over the splined rotatable shaft. The slider includes an actuator that protrudes from the slider to engage one of the cross gears to actuate a respective one of the plurality of valves.

A heat pump system includes: a compressor for compressing refrigerant; a first heat exchanger for exchanging heat between the refrigerant compressed by the compressor and a heating medium; a second heat exchanger for exchanging heat between the refrigerant compressed by the compressor and the heating medium; a first pipe through which the refrigerant is fed from the compressor to the first heat exchanger; a second pipe through which the refrigerant returns from the first heat exchanger to the compressor; a third pipe through which the refrigerant is fed from the compressor to the second heat exchanger after returning from the first heat exchanger; and switching apparatus for switching a flow of the heating medium between a first mode and a second mode. The heating medium flows through the first heat exchanger and the second heat exchanger in series in the first mode. The heating medium flows through the first heat exchanger and the second heat exchanger in parallel in the second mode.

A heated water delivery system comprising: a system inlet and a system outlet, with a primary flow path and a secondary flow path in a parallel configuration in between; the primary flow path comprising a primary source of heated water; the secondary flow path comprising a secondary source of heated water; the system further comprising switching means comprising a valve disposed within the primary flow path, the switching means being arranged to deliver heated water from the primary source when a temperature of the water from the primary source is greater than a threshold temperature, and being arranged to selectively deliver heated water from the at least one secondary source when the temperature of the water from the primary source is less than a threshold temperature. The switching from one source to another is determined by the relative change in pressure drop of the flow paths.

A heating or cooling installation control valve includes a movable valve element which is arranged in a valve space (8), as well as at least two connection channels (24, 26) which each have a first end in fluidic connection with the valve space (8) and have an opposite second end (A, B) for connection to a fluid-leading component. A sealing element (18) is arranged in at least one of the connection channels (24, 26) at a first end thereof. The sealing element is in contact with the valve element (6). The at least one connection channel (24, 26), in which the sealing element (18) is arranged, in addition to the second end (A, B), includes an assembly opening, through which the sealing element (18) can be inserted into the connection channel (24) and removed from of the connection channel (24).