The present invention describes a water recirculation system intended for recycling of water or discarding of water not suitable to recycle, said water recirculation system (1) comprising a flow path for recirculation (50), at least one water treating unit (6), and a sensor unit (7) arranged for measurement of at least water quality, and wherein the sensor unit (7) is connected to a control unit which decides if water should be recycled or discarded in a point of separation (30) based on the measurement of the water quality, said water recirculation system (1) also comprises a first heating source (00), and wherein the water recirculation system (1) also comprises a second heating source (200).

The present disclosure provides a method for operating the hydronic system, which includes monitoring, by a control unit, a volume of hot water in a hot storage tank via a first set of flowmeters and a volume of chilled water in a cold storage tank via a set of second flowmeters. A first outlet temperature of the hot water is monitored by the control unit, via a first temperature sensor and a second outlet temperature of the chilled water via a second temperature sensor. A heat pump unit is operated by control unit, for recharging the hot water and the chilled water within the hot storage tank and the cold storage tank respectively. The heat pump unit is operated when a respective predetermined limit reaches for at least one of the volume of the hot water, the volume of the chilled water, the first outlet temperature and second outlet temperature.

The concepts relate to reducing energy loss associated with hot water systems. One example can monitor hot water use in a system. Upon completion of the hot water use, the example can recover some of the hot water from hot water lines into a water heater that heated the hot water. The method can also deliver the recovered hot water to the water heater in a manner that affects operation of a heating element of the water heater.

A liquid heating appliance for heating water or other liquids, suitably to a target temperature of from 55 C. to around boiling point, includes a primary heat chamber or body (heat source chamber) that is thermally insulated and which in use contains a high thermal density heat storing liquid or solid; and a secondary chamber alongside the primary chamber through which a liquid to be heated is passed in use. The appliance has a heat transfer feature to selectively transfer thermal energy from the heat-storing liquid or solid to the liquid to be heated in the secondary chamber. The secondary chamber is preferably a conduit through which the liquid to be heated is able to flow and the thus heated liquid can be delivered to a tap as hot water for a range of uses. Water may also be heated for a central heating system for space heating.

A fluid heating system may be installed for residential and commercial use, and may deliver fluid at consistent high temperatures for cooking, sterilizing tools or utensils, hot beverages and the like, without a limit on the number of consecutive discharges of fluid. The fluid heating system is installed with a tankless fluid heating device that includes an inlet port, an outlet port, at least one heat source connected with the inlet port, and a valve connecting the at least one heat source to the outlet port. A temperature sensor is downstream of the at least one heat source and connected to the valve. Another temperature sensor is on the heat source to enable it to be kept at an elevated temperature. The valve is operated so that an entire volume of a fluid discharge from the fluid heating system is delivered at a user-specified temperature on demand, for every demand.

A water dispensing apparatus includes a hot water module configured to heat supplied water using an induction heating method, a water supply pipe configured to supply water to the hot water module, a flow rate control valve provided on the water supply pipe to control a flow rate of water supplied to the hot water module, a flow rate sensing device provided on the water supply pipe to sense the flow rate of water supplied to the hot water module, and a controller configured to increase an opening speed of the flow rate control valve when the flow rate of supplied water sensed through the flow rate sensing device is equal to or less than a set flow rate.

A fluid heating system including a heating chamber that receives fluid and heats the fluid to provide heated fluid, a dispensing device that dispenses the heated fluid, the dispensing device encompassing the heating chamber, a thermostatic control device that regulates a power supply to the heating chamber, an energy recovery device that harvests mechanical energy provided by a flow of the heated fluid from the heating chamber to the dispensing device and generates electrical energy to power the thermostatic control device, a pressure regulating valve, wherein in a closed position, passage for the heated fluid is prevented between the heating chamber and the drain when a pressure in the heating chamber is below a predetermined pressure threshold and passage for the heated fluid is provided between the heating chamber and the drain when the pressure in the heating chamber is above the predetermined pressure threshold.

An intelligent water purifying system includes a water purifying module, a heating module, a raw water inlet port, and a pure water outlet port. An inlet end of the water purifying module is connected and in communication with a raw water inlet port, a water outlet end of the water purifying module is connected and in communication with an inlet port of the heating module, and an outlet port of the heating module is connected and in communication with a hot water output pipe. The heating module includes: a heating tank for storing water, and a heating module controller used to control heating of pure water in the heating tank to a preset temperature. The intelligent water purifying system is able to provide water purifying and heating functions at the same time.

A controlled system and method for operating a lower resistive heating element of an electric water heater is described to kill bacteria in a lower portion of a water holding tank of an electric water heater. A controller having a timer circuit operates the lower resistive heating element bypassing the control of the thermostat associated with the upper and lower resistive heating element to maintain the lower resistive heating element active during a predetermined sanitizing time period whereby the temperature in the lower portion of the tank is maintained at a predetermined temperature sufficient to kill bacteria. The controller is programmed to override a load shedding function during the predetermined sanitizing time operiod.

Plumbing systems utilizing a single pipe with individual heating elements located in close proximity to individual plumbing fixtures. These provide users with the ability to control the temperature of water at the site of the individual fixture without need to mix hot and cold water to obtain a desired temperature.