Water heater apparatus includes a tank for storing water; a heat exchanger associated with the tank and being operative to receive refrigerant and transfer heat therefrom to the tank, the heat exchanger representatively being a heat conductive tube externally wrapped around the tank in heat conductive contact therewith; air conditioning apparatus operative to utilize refrigerant flowing through a refrigerant circuit portion of the air conditioning apparatus, the refrigerant circuit portion being in fluid communication with the heat exchanger; and a control system operative to selectively cause a portion of the flowing refrigerant to pass through the heat exchanger, or cause essentially the entire flow of the refrigerant to bypass the heat exchanger.

A system for conditioning air circulated from an interior of a building includes a refrigerant path, an air-cooled condenser in the refrigerant path, a water-cooled condenser in the refrigerant path that transfers heat from refrigerant in the refrigerant path to the building water, an evaporator in the refrigerant path, and a control system. The control system moves the system between operation of the air-cooled condenser and the water-cooled condenser based upon predetermined system conditions.

A hot water unit fluid supply control system for a hot water unit is disclosed. The hot water unit has a heating system that is operable in a heating cycle to heat up water in at least a first region of the water unit, and a sensor arrangement for sensing a temperature of water of the hot water unit. The control system comprises a control unit configured to: receive operational data relating to an operation of the heating system; receive temperature data from the sensor arrangement; and allow for a volume of water from the first region to be released from the hot water unit as treated water or usable water based on: the operational data, and the temperature data from the sensor arrangement.

A system includes a heat pump including a system for conveying a refrigerant fluid between two heat exchangers, the refrigerant fluid circulating through a closed circuit; at least two heat exchangers, at least one of the first and second heat exchangers including a plurality of energy storage devices collecting a portion of the energy of the refrigerant fluid or of a secondary fluid; a system for conveying the refrigerant fluid intended to receive or transmit a given amount of energy through the plurality of energy storage devices, and a system for conveying a secondary fluid intended to receive or transmit a given amount of energy through the plurality of energy storage devices.

The present disclosure provides a computer-implemented method of defrosting a heat pump of a water provision system installed in a building, the water provision system comprising the heat pump configured to transfer thermal energy from outside the building to a thermal energy storage medium inside the building and a control module configured to control operation of the heat pump, the water provision system being configured to provide water heated by the thermal energy storage medium to an occupant of the building at one or more water outlets, the method being performed by the control module and comprising: determining, based on performance of the heat pump, an expected start time of a next defrost cycle; and preparing the water provision system before the expected start time of the next defrost cycle.

A system for regulating a thermo-hydraulic circuit has a thermal machine, a heat exchange terminal, a carrier fluid circulation system having a delivery duct, a return duct, and a three-way valve. The system has a pump, a first temperature sensor measuring post-valve delivery temperature of the carrier fluid downstream of the three-way valve, a second temperature sensor measuring pre-valve delivery temperature of the carrier fluid, and a third temperature sensor measuring temperature of the carrier fluid downstream of the heat exchange terminal. A flow or flow rate sensor measures a mass or volumetric flow rate of the carrier fluid. An electronic control unit has a storage device in which a model function of the thermo-hydraulic circuit is stored. A processing unit calculates values of a valve control signal and a pump control signal as function of a mass or volumetric flow rate error and a carrier fluid delivery temperature error.

A controller of a heat pump water heating system drives circulation pumps, and uses a heat pump unit to increase a temperature of tank water within a hot water storage tank via a plate heat exchanger if the temperature of the tank water detected from a temperature sensor is lower than a heat source switch tank temperature, and the controller stops one of the circulation pump, drives other circulation pumps, and uses a boiler to increase the temperature of the tank water within the hot water storage tank via the plate heat exchanger in a shorter time than that of a case in which the heat pump unit is used to increase the temperature if the temperature of the tank water detected from the temperature sensor is equal to or higher than the heat source switch tank temperature.

A hot water supply apparatus includes a hot water supply channel. The hot water supply channel includes a heating section configured to heat water and a tank configured to store the water heated by the heating section. The hot water supply channel is configured to execute a first hot water supply operation in a hot water storage state in which a low-temperature layer, a medium-temperature layer, and a high-temperature layer are formed in the tank. The first hot water supply operation includes heating water in the medium-temperature layer to a first temperature by the heating section and supplying the water heated to a hot water supply target.

An apparatus for heating water has a tank for storing water and an air conditioning system that defines a refrigerant flow path through which refrigerant flows. The refrigerant flow path passes through the heat exchanger so that refrigerant heat is contributed to the tank. A control system controls operation of the water heating apparatus.

A heat pump water heater appliance includes a tank that defines an interior volume. A drain pan is positioned below an evaporator of a sealed system. A liquid monitoring sensor has a voltage divider with a pair of probes. The probes of the pair of probes extend into the drain pan. A related method for operating a heat pump water heater appliance is also provided.