The present invention relates to a water system with a warm water line (3) for supplying at least one first consumer (4, 4a, 4b) connected thereto with warm water and a continuous flow heater (1), in which cold water introduced into the latter is heatable, connected to said warm water line (3). In case warm water remains in the continuous flow heater, because it is only partially consumed, limescale deposit can reduce the performance and the service life of the continuous flow heater. Limescale deposit is particularly likely to happen in stagnant warm water. The present invention aims to solve aforesaid problem in that a flushing station (2) connected to said warm water line (3) is provided, by way of which stagnant water in said warm water line can be drained in a chronological sequence until the water contained in said continuous flow heater (1) is below a predetermined setpoint temperature.

A system containing a device mounted to the flange of a tank style water heater while being connected to a AC power-source and thereby treating and heating the water, within a passage between electrodes in a core, simultaneously delivering bacteria free warm or hot improved water without limescale issues and being 20% to 30% more energy efficient. Furthermore, a method is describe using a pump to deliver the water to the device in connection with a control solution.

In an immediate hot water supply operation mode in which a circulation pump is activated while a hot water supply faucet is closed, a water heating apparatus forms an immediate hot water supply circulation path by an inner path and an outer path as being combined, the inner path including a heating mechanism including a combustion mechanism and a heat exchanger, the outer path bypassing the hot water supply faucet outside the water heating apparatus. The outer path includes a crossover valve. In the immediate hot water supply operation mode, a controller introduces intermittent combustion to control a detection temperature detected by the temperature sensor to a set temperature. In intermittent combustion, a minimum combustion state and a combustion stop state are alternately provided. In the minimum combustion state, a quantity of heat output from the combustion mechanism is reduced to a minimum value.

A drinking water supply system includes a drinking water line system, a plurality of drinking water withdrawal points connected to the drinking water line system, at least one sensor which is designed to determine measuring values, and a central control device which is designed to receive and evaluate the measuring values determined by the at least one sensor. The system also includes a presence detector designed to determine information about the presence of a person, or an acoustic sensor designed to measure measuring values for the volume. The central control device is designed to control the drinking water supply system as a function of the information about the presence of a person or as a function of the measured values for the volume. A method for controlling such a drinking water supply system and a computer program that causes the method to be carried out are also provided.

An electric water heater is described and wherein the bottom portion of the water holding tank is provided with various forms of electric heating elements to heat the water in the lowermost region of the tank adjacent the dome-shaped bottom wall to a temperature sufficient to prevent the proliferation of bacteria growth such as the Legionella bacteria in such lowermost region. The insulating foam support base of the water heater also provides a thermal barrier to the heating elements while biasing the heating element on the dome-shaped bottom wall in a region to insure excellent heat transfer to the cavitated zone surrounding the dome-shaped bottom wall where sedimentary deposits occur to create a culture medium for bacteria growth.

The present invention describes a combined water heater and water treatment device 1, said combined water heater and water treatment device comprising a water treatment unit 2 being embedded by a single container 3 of the combined water heater and water treatment device 1, and said combined water heater and water treatment device 1 also comprising a heater element 4 arranged on the outside of the single container 3 of the combined water heater and water treatment device.

An electric water heater having a water holding tank defined by a cylindrical side wall, a top wall and a dome-shaped bottom wall. A cold water inlet is disposed for releasing water under pressure in a lower portion of the tank. Two or more resistive heating elements heat water in an upper and lower region of the tank. The lower portion of the cylindrical side wall and the outer circumferential portion of the dome-shape bottom wall form a circumferential cavitated area inside the tank in which sediments deposit forming a bed in which bacteria can proliferate. A conduit is secured about at least a substantial circumferential portion of an outer surface of the cylindrical side wall adjacent the cavitated area. A resistive heating wire is disposed in the conduit and has connection leads extending out of a free open end of the conduit to an access area to provide connection to power terminals and a control for controlling the supply of power to the resistive heating wire.

An electric water heater is described and wherein a bottom resistive heating element extends in at least a portion of the cavitated circumferential area defined inside the tank between the tank side wall and the dome-shaped bottom wall and wherein deposits accumulate to create a culture medium for bacteria growth. The bottom resistive heating element heats water in this cavitated area to a temperature sufficient to sanitize a lower region of said water holding tank and to kill bacteria such as the Legionella bacteria.

The present invention describes a water distribution and water treating architecture system comprising a light grey water tank, said light grey water tank being connected to a fresh water inlet, said light grey water tank further being connected to a heater so that both cold and hot water may be fed to a water treating and distributing unit from the light grey water tank, said water treating and distributing unit comprising a water treating unit, wherein the water distribution and water treating architecture system also comprises a user unit with a user outlet and a sensor unit tank, which sensor unit tank comprises at least one sensor directed to measuring water quality and sending information to a control unit, wherein the water distribution and water treating architecture system comprises a user water recirculation loop enabling recirculation of water from the sensor unit tank 9 into the water treating and distributing unit and water treating unit and further to the user outlet, said sensor unit tank also being connected to a grey water outlet unit; and wherein the water distribution and water treating architecture system also comprises a water feeding recirculation loop enabling recirculation of water from the light grey water tank into the water treating and distributing unit and water treating unit and back to the light grey water tank.

A water holding tank for electric water heaters is described and particularly an improvement to the bottom end construction of the tank to prevent bacteria proliferation and the elimination of the cavitated circumferential area where sediments deposit to form a culture bed for bacteria to proliferate. Instead of modifying the shape of the bottom wall the improvement is a simple solution in that a filler material is set in at least a lowermost portion, and preferably a major portion, of the cavitated circumferential area to isolate that area from the interior of the water holding tank and form smooth flat surface areas which are planar to cause sediments to disperse and not form beds for bacteria to proliferate.