An automatically flushing water heater maintenance system may be provided, the system including a water heater and a water heater controller. The water heater may include an inlet, an outlet, and a flush outlet having a first control valve in flow communication therewith. The first control valve may be configured to control a flow of water and sediment through the flush outlet out of the water heater. The water heater controller may be configured to communicate with the first control valve by transmitting a first control signal to the first control valve, the first control signal configured to cause the first control valve to open or close as part of an automatic flushing process. As a result of the flushing, the useful life of the water heater may be extended, and/or water heater leakage alleviated. Insurance discounts may be provided based upon using the automatic water heater flushing functionality.

An automated descaling system can be integrated into a tankless water heater or can be a separate system that is attached to a tankless water heater. The automatic descaling system comprises a cleaning media chamber and a four way valve with a motor. The descaling system can be set on an automatic cleaning schedule.

A scale adhesion prevention operation of a circulation pump operated in an instant hot water operation is efficiently and appropriately performed. An instant hot water circulation path is formed to bypass a hot water tap outside a hot water supply device and to pass through a heat exchanger inside the hot water supply device by operating a circulation pump when the hot water tap is closed. A controller performs a protection operation which operates the circulation pump when a first condition in which stop of the circulation pump is continued for a first time is satisfied and a second condition related to stop of a hot water supply operation is further satisfied.

A water heater flushing system includes a housing having an inlet configured to be coupled to a drain port of the water heater and receive water therefrom, and an outlet configured to discharge water from the housing. A series of filter elements are positioned and spaced apart within the housing transverse to a water flow path defined between the inlet and the outlet, the series of filter elements are configured to separate solid impurities from the water according to different particle sizes (e.g. progressively different or finer particle sizes) in the water flow path between the inlet and the outlet. A viewing feature, such as a transparent lid, is carried by the housing and configured to provide visual access to an interior of the housing for inspection of separated solid impurities at each of the filter elements. A sediment buster may be coupled to the inlet of the housing and configured to send a fluid into the drain port of the water heater. The sediment buster may include a fluid supply device, and shut-off valve between the fluid supply device and the inlet of the housing.

A method for constructing a water circulation device including a water circulation circuit that circulates water heat-exchanged with a refrigerant heated by a heat pump includes: installing a heater in the water circulation device in contact with the water; depositing scale from the water on the heater by heating the heater while circulating the water in the water circulation circuit; and removing the heater from the water circulation device after the depositing.

A tankless water heater including a water inlet, a water outlet, a conductivity sensor, a temperature sensor, and a heating chamber connected to the water inlet and the water outlet wherein the heating chamber is configured to heat a flow of water received from the water inlet and output the flow of water to the water outlet. The water heating system can further include a controller communicably coupled to the conductivity sensor and the temperature sensor, where the controller calculates an adjusted conductivity of a flow of water through the water heater.

A combustion gas supply system and method includes: a cyclonic air filter (or separator), a blower having an inlet and an outlet, and a combustible gas inlet, wherein the cyclonic air filter, the blower, and the combustible gas inlet are in fluid communication.

Improved steamblow commissioning of a steam plant with steam discharged to the condenser and increased use of permanent piping instead of temporary piping with quenching/desuperheating and providing a low back pressure environment to enable aggressive steam blow cleaning.

A method for removing a deposition of scale on a heating element may include turning on the heating element to heat the liquid in the heating space, determining a first value (Tv1) of temperature of the heating element and/or a first time period (tp1) during heating of the liquid. The method may further include turning off the heating element and turning on the heating element at a second value (Tv2) of temperature of the heating element and reheating the liquid in the heating space until temperature of the heating element reaches a third value (Tv3) related to the first value (Tv1) and/or until a second time period (tp2) related to the first time period (tp1) is reached. A household appliance may also be provided.

Provided is an instantaneous hot water circulation unit with a scale cleaning function which can easily perform pipe cleaning for removing scale. The instantaneous hot water circulation unit which includes a hot water supply inlet portion connected to a hot water discharge unit of a hot water supply device, a hot water supply outlet portion connected to an external hot water supply unit, a hot water returning unit, a hot water outgoing unit, a hot water supply pipe, a hot water pipe, and a circulation pump, and a bypass pipe, which drives the circulation pump to perform an instantaneous hot water circulation operation when stoping hot water supply, wherein a storage tank configured to store a cleaning agent used in a cleaning operation of cleaning an inside of the pipe of the hot water supply device is provided at the bypass pipe.