A water heater system includes a water heater having a first water outlet and a second water outlet. The water heater system further includes a flow detection device coupled to the first water outlet to detect a water flow through the first water outlet. The water heater system also includes a flow control valve fluidly coupled to the second water outlet. The flow control valve is configured to control a flow of water through the second water outlet based on whether the water flow through the first water outlet is detected by the flow detection device.

Disclosed is an air heating apparatus including a burner configured to cause a combustion reaction, a main passage, through which water flows while circulating, a heat exchanging device configured to receive heat from combustion gas generated by the combustion reaction and heat the water flowing along the main passage, a heating heat exchanger configured to receive the water heated by the heat exchanging device and exchange heat with the air for heating, a fan configured to send the air to the heating heat exchanger, and a hot water discharge port connected to the main passage such that the water heated by the heat exchanging device is discharged to an outside of the main passage.

Disclosed is an air heating apparatus including a burner that causes a combustion reaction, a main passage, through which water flows while circulating, a heat exchanging device that receives heat from combustion gas generated by the combustion reaction and heats the water flowing along the main passage, a heating heat exchanger that receives the water heated by the heat exchanging device and exchanges heat with the air for heating, a fan that blows the air to the heating heat exchanger, and an expansion tank disposed in the main passage to accommodate a change in a volume of the water and having an expansion opening opened to an outside.

A flow sensor of a domestic appliance has an axle that is substantially perpendicular in the installed state to the flow direction of a fluid channel of the domestic appliance. The bearing component is designed as a single part and has at least two interconnected limbs, each limb having an axle mount for one end of the axle of the flow sensor, wherein the two axle mounts are mutually spaced apart in such a way that they correspond in a relaxed condition of the bearing component to an extension of the axle of the flow sensor. The two limbs are designed to be elastic such that the spacing between the axle mounts can be increased in order to insert the flow sensor between the axle mounts.

The water heater may be configured to execute a normal operation in which a heating means is continuously operated in an ON state in a case where a required heat quantity is greater than or equal to a minimum heat quantity. The water heater may be configured to execute an intermittent operation in which the heating means is alternately and repeatedly operated in the ON state and an OFF state repeatedly in a case where the required heat quantity is less than the minimum heat quantity. The water heater may be configured to change a distribution ratio of a flow control mechanism in the normal operation and in the intermittent operation. An operating speed of the flow control mechanism in the intermittent operation may be faster than an operating speed of the flow control mechanism in the normal operation.

A heating and hot-water supply apparatus shortens the time taken for hot-water supply to stabilize at a set temperature in response to a request for a hot-water supply operation during a heating operation. The apparatus performs, using a common heating medium heated by a heater, a heating operation by circulating the heating medium through a heating terminal, and a hot-water supply operation of heating service water through heat exchange with the heating medium circulated through a hot-water supply heat exchanger and supplying hot water. A distribution unit (three-way valve) changes a distribution ratio of the heating medium between the heating terminal and the hot-water supply heat exchanger. A controller controls an amount of heat generated by the heater for the heating operation or the hot-water supply operation, and stops heating with the heater when the temperature of the heating medium reaches a predetermined upper-limit temperature.

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 including a water entry path, a heat exchanger, and a hot water output path and an outer path bypassing the hot water supply faucet, as being combined. A controller stores as an actual flow rate value for each immediate hot water supply operation mode, a flow rate detection value by a flow rate sensor at predetermined timing, and calculates a flow rate learning value based on a plurality of stored actual flow rate values. When the flow rate detection value becomes larger than a criterion value set in accordance with the flow rate learning value, use of the hot water supply faucet is detected and the circulation pump is deactivated.

A water heater including an inflow terminal for connecting a tankless water heater to a cold water supply and an outflow terminal for connecting the tankless water heater to a tap. A fluid channel proves a fluid connection from the inflow terminal to the outflow terminal. A heat element arrangement is arranged at or within at least a section of the fluid channel for transferring heat to fluid present within the fluid channel. An electronic controller is configured to control a heating power provided to the heat element arrangement. A flow sensor is arranged at or within the fluid channel downstream the heat element arrangement. The electronic controller is further configured to detect the presence of air bubbles within the fluid channel based on a change of a flow signal provided by the flow sensor and to adapt the heating power provided to the heat element arrangement in reaction to the determination of air bubbles.

An aircraft water supply system supplies water to a water discharge port in an aircraft. A cold water flow path supplies cold water to the water discharge port. A hot water flow path supplies hot water to the water discharge port. A first control valve adjusts the flow rate of cold water flowing through the cold water flow path. A second control valve adjusts the flow rate of hot water flowing through the hot water flow path. A flow sensor detects the flow rate of water at any point up to the water discharge port. A flow control unit controls the opening/closing state of the first control valve and the second control valve based on the water temperature detected by the flow sensor so that the amount of the water discharged from the water discharge port reaches a predetermined target flow rate.

A hot-water supply device includes a hot-water dispenser supplying hot-water, a hot-water supply path supplying the hot-water to a hot-water supply tap, a circulation path carrying out instant hot-water operation which circulates and heats the hot-water remaining in the hot-water supply path, a first clock repeatedly measuring unit times in which a pattern of hot-water usage of a user makes a round, and a flow rate sensor detecting the supply of the hot-water from the hot-water supply tap. The control portion detects, for each of the unit times and based on detection signals of the flow rate sensor, a time zone in which hot-water supply operation is carried out, and reserves, based on a time zone in a first unit time in which the hot-water supply operation is carried out, a time zone in a second unit time following the first unit time for carrying out the instant hot-water operation.