A dishwashing appliance includes a tub defining a wash chamber therein for receipt of articles for washing, a heating element, a sump positioned at a bottom of the wash chamber for receiving fluid from the wash chamber, a drain pump in communication with the sump, and a temperature sensor. Methods of operating the dishwashing appliance may include filling the sump with a liquid and heating the liquid by activating the heating element. Such methods also may include measuring a temperature of a liquid in the sump with the temperature sensor and comparing the measured temperature of the liquid to a minimum drain temperature threshold. Such methods may include draining the liquid from the sump after the measured temperature is equal to or greater than the minimum drain temperature threshold, such as immediately after heating the liquid.

A method for cleaning dishes in a warewasher is provided: It may include filling a sump with hot water, dispensing detergent into the sump, running a wash cycle, draining the used hot water and detergent from the sump after the wash cycle, flushing the sump, filling the sump with the aqueous ozone solution, and running a rinse cycle with the aqueous ozone solution. A warewasher is provided: It may include a timer, a wash chamber, a sump, a hot water fill solenoid configured to direct hot water into the sump, a chemical dispenser, at least one spray arm, a circulation pump, an ozone generator assembly configured to provide aqueous ozone solution to the sump, and a drain assembly. The timer may control the hot water fill solenoid, the chemical dispenser, the circulation pump, the ozone generator assembly, and the drain assembly to effectuate a cleaning sequence.

An impeller for a pump for a dishwasher having a base with an axis of rotation, and at least one fin protruding from the base. The impeller also has a cap removably coupled to the impeller and at least one blade integrally formed with the cap.

A method for cleaning dishes in a warewasher is provided: It may include filling a sump with hot water, dispensing detergent into the sump, running a wash cycle, draining the used hot water and detergent from the sump after the wash cycle, flushing the sump, filling the sump with the aqueous ozone solution, and running a rinse cycle with the aqueous ozone solution. A warewasher is provided: It may include a timer, a wash chamber, a sump, a hot water fill solenoid configured to direct hot water into the sump, a chemical dispenser, at least one spray arm, a circulation pump, an ozone generator assembly configured to provide aqueous ozone solution to the sump, and a drain assembly. The timer may control the hot water fill solenoid, the chemical dispenser, the circulation pump, the ozone generator assembly, and the drain assembly to effectuate a cleaning sequence.

A method for operating a recirculating chemical-sanitizing dishwasher includes filling a wash tank of the dishwasher with water, and performing a first cycle of washing by circulating the water through a wash chamber of the dishwasher. A partial drain is performed of a first amount of water from the wash tank, and new water (for example, rinse water) is added to the wash tank for a second amount of water approximately equal to the first amount. A second cycle of washing is performed by circulating the water through the wash chamber of the dishwasher.

An impeller for a pump for a dishwasher having a base with an axis of rotation, and at least one fin protruding from the base. The impeller also has a cap removably coupled to the impeller and at least one blade integrally formed with the cap.

A dishwasher comprising a chassis, a tub supported by the chassis and at least partially defining a treating chamber, and a pump that circulates wash liquid in the treating chamber. The pump has an impeller that has a cover, a base with an axis of rotation, and at least one fin protruding from the base. The impeller also has a cap removably coupled to the impeller and at least one blade integrally formed with the cap.

A method for cleaning dishes in a warewasher is provided: It may include filling a sump with hot water, dispensing detergent into the sump, running a wash cycle, draining the used hot water and detergent from the sump after the wash cycle, flushing the sump, filling the sump with the aqueous ozone solution, and running a rinse cycle with the aqueous ozone solution. A warewasher is provided: It may include a timer, a wash chamber, a sump, a hot water fill solenoid configured to direct hot water into the sump, a chemical dispenser, at least one spray arm, a circulation pump, an ozone generator assembly configured to provide aqueous ozone solution to the sump, and a drain assembly. The timer may control the hot water fill solenoid, the chemical dispenser, the circulation pump, the ozone generator assembly, and the drain assembly to effectuate a cleaning sequence.

A dishwashing appliance includes a tub defining a wash chamber therein for receipt of articles for washing, a heating element, a sump positioned at a bottom of the wash chamber for receiving fluid from the wash chamber, a drain pump in communication with the sump, and a temperature sensor. Methods of operating the dishwashing appliance may include filling the sump with a liquid and heating the liquid by activating the heating element. Such methods also may include measuring a temperature of a liquid in the sump with the temperature sensor and comparing the measured temperature of the liquid to a minimum drain temperature threshold. Such methods may include draining the liquid from the sump after the measured temperature is equal to or greater than the minimum drain temperature threshold, such as immediately after heating the liquid.

A dishwasher comprising a chassis, a tub supported by the chassis and at least partially defining a treating chamber, and a pump that circulates wash liquid in the treating chamber. The pump has an impeller that has a cover, a base with an axis of rotation, and at least one fin protruding from the base. The impeller also has a cap removably coupled to the impeller and at least one blade integrally formed with the cap.