A hot-water supply system heats up water by power generated by power generation means. The hot water supply system includes a compressor and a water heat-up unit. In the hot-water supply system, the compressor compresses refrigerant and circulates the refrigerant through a refrigerant circuit. The water heat-up unit heats up water by changing, in accordance with the generated power, a rotation rate of an electric motor for driving the compressor.

Disclosed herein are WIFI and could enabled temperature control systems. The temperature control systems are configured to receive user temperature settings and preferences, and control a water heater based on the user temperature settings and preferences. The temperature control systems include two or more sampling rates for enabling a higher efficiency of operation compared to conventional water heaters.

An energy meter apparatus includes a sensing unit including a first temperature sensor configured to measure temperature of the fluid at a first boundary of the system and a processing-reporting unit comprising a second temperature sensor configured to measure temperature of the fluid at a second boundary of the system. One or both of a flow sensor and a pressure sensor is included in one of the sensing unit and the processing-reporting unit, and the pressure sensor is included in one of the sensing units and the processing-reporting unit. The processing-reporting unit is configured to establish and maintain a first wireless communication channel for communication with the sensing unit. The sensing unit is configured to report sensor measurements to the processing-reporting unit via the wireless communication channel.

An energy meter apparatus includes a sensing unit including a first temperature sensor configured to measure temperature of the fluid at a first boundary of the system and a processing-reporting unit comprising a second temperature sensor configured to measure temperature of the fluid at a second boundary of the system. One or both of a flow sensor and a pressure sensor is included in one of the sensing unit and the processing-reporting unit, and the pressure sensor is included in one of the sensing units and the processing-reporting unit. The processing-reporting unit is configured to establish and maintain a first wireless communication channel for communication with the sensing unit. The sensing unit is configured to report sensor measurements to the processing-reporting unit via the wireless communication channel.

Disclosed herein are WIFI and could enabled temperature control systems. The temperature control systems are configured to receive user temperature settings and preferences, and control a water heater based on the user temperature settings and preferences. The temperature control systems include two or more sampling rates for enabling a higher efficiency of operation compared to conventional water heaters.

An aspect of some embodiments of the current invention relates to an integrated system for heat distribution among a plurality of users. In some embodiments, the system includes a separate automatic control of heat distribution to each user and/or separate billing to each user. For example, a system may supply hot fluid to a plurality of apartments in a building and/or in multiple buildings. Optionally, each apartment has separate remote controlled valves controlling flow of heated fluid to the apartment and/or a sensor sensing how much heat enters and leaves the apartment in the hot fluid. In some embodiments, a processor controls the valve and/or receives data from sensors. The processor optionally controls devices that generate and/or store and/or dissipate heat. Optionally the processor predicts energy availability, costs and needs controls valves and/or devices to provide for predicted and/or unexpected needs while reduce cost of the energy.

A system and related method to analyze operation of a heating system of a building based on fuel consumption and fuel demand of the building. The system includes a database of information about the heating system of the building, a first sensor set arranged to gather fuel consumption information and a second sensor set arranged to gather fuel demand information within the building. The system includes a fuel usage and demand analysis function configured to analyze data from the first sensor set and from the second sensor set to output a determination of operation of the heating system based on consumption information and demand information.

An indicator generating method for generating an indicator which is suitable for maintenance prediction of a water heating system is proposed. A power state indication device generates a high power consumption signal if a heating device of the water heating system is activated. The time duration of the activation is such an indicator, if no water flow is present. Furthermore, the time interval between subsequent activations is such an indicator. A predictive maintenance method processes these condition-based indicators and determines a remaining useful lifetime according to a predictive maintenance model. The predictive maintenance device outputs a maintenance signal indicating required maintenance, if the remaining useful lifetime drops below a predetermined threshold. The methods may be performed by water heating systems or beverage makers.

The present disclosure relate to a controller system and method for use in storage-style water heating systems that offers significant opportunities for energy saving. The controller system can adjust the water heating system in response to energy demand patterns of user fixtures. The controller system can detect quantity of heated water usage and produce a heated water usage profile. The controller system can determine the quantity or volume of the used heated water without a mechanical flow meter. The controller system can include a cost-effective, accurate, and easy-to-install water temperature sensors that provide measurements of the differentials between water temperatures without direct contact with the water. The water temperature sensors can be cost-effective and easy-to-install sensors that are attached to the water pipes through a strap or other attachment methods.

An electric water heater tank adapted for connection to a controller, the tank including one or more electrical heating elements temperature sensing means mounted on the exterior of the tank wall and adapted to obtain a measurement of the temperature of the water in the tank, the temperature sensing means and each heating element being connected to an externally accessible connection means. The tank can include one or more heating element control means each connected to a corresponding one of the heating elements. The element control means can be connected to the externally accessible connection means.