A water heating system includes a first heating chamber arranged in parallel with a second heating chamber; a first temperature sensor positioned to sense a first temperature in the first heating chamber; a second temperature sensor positioned to sense a second temperature in the second heating chamber; and a controller configured to: determine a first temperature value based on a first sensor signal from the first temperature sensor, determine a second temperature value based on a second sensor signal from the second temperature sensor, compute a differential between the first temperature value and the second temperature value, determine that scale buildup is indicated in response to the differential exceeding a first threshold, and initiate a corrective action in response to determining that scale buildup is indicated.

A water heating system includes a first heating chamber arranged in parallel with a second heating chamber; a first temperature sensor positioned to sense a first temperature in the first heating chamber; a second temperature sensor positioned to sense a second temperature in the second heating chamber; and a controller configured to: determine a first temperature value based on a first sensor signal from the first temperature sensor, determine a second temperature value based on a second sensor signal from the second temperature sensor, compute a differential between the first temperature value and the second temperature value, determine that scale buildup is indicated in response to the differential exceeding a first threshold, and initiate a corrective action in response to determining that scale buildup is indicated.

A modular heat pump water tank is provided. The modular heat pump water tank comprises a tank unit including a tank for containing heated water; a heat pump unit including a heat pump for providing heat to the tank; and a heat exchanger arranged externally to the tank for transferring heat from the heat pump to water from the tank. The tank unit and the heat pump unit are adapted for mounting to one another to form an integrated heat pump water tank.

A modular heat pump water tank is provided. The modular heat pump water tank comprises a tank unit including a tank for containing heated water; a heat pump unit including a heat pump for providing heat to the tank; and a heat exchanger arranged externally to the tank for transferring heat from the heat pump to water from the tank. The tank unit and the heat pump unit are adapted for mounting to one another to form an integrated heat pump water tank.

A method of determining calcification of at least a portion of a water heating assembly in a home appliance having a treating chamber. The method includes supplying heated water to the treating chamber via the water heating assembly. The water heating assembly includes a heating element that is selectively energized. A number of thermostat trips are sensed during at least a portion of a cycle of operation. A water temperature value indicative of a water temperature can be sensed. A calcification level of the heating element or the at least a portion of the water heating assembly can be determined based on the number of thermostat trips and the water temperature value.

A method of determining calcification of at least a portion of a water heating assembly in a home appliance having a treating chamber. The method includes supplying heated water to the treating chamber via the water heating assembly. The water heating assembly includes a heating element that is selectively energized. A number of thermostat trips are sensed during at least a portion of a cycle of operation. A water temperature value indicative of a water temperature can be sensed. A calcification level of the heating element or the at least a portion of the water heating assembly can be determined based on the number of thermostat trips and the water temperature value.

A method of determining calcification of at least a portion of a water heating assembly in a home appliance having a treating chamber. The method includes supplying heated water to the treating chamber via the water heating assembly. The water heating assembly includes a heating element that is selectively energized. A number of thermostat trips are sensed during at least a portion of a cycle of operation. A water temperature value indicative of a water temperature can be sensed. A calcification level of the heating element or the at least a portion of the water heating assembly can be determined based on the number of thermostat trips and the water temperature value.

A method of determining calcification of at least a portion of a water heating assembly in a home appliance having a treating chamber. The method includes supplying heated water to the treating chamber via the water heating assembly. The water heating assembly includes a heating element that is selectively energized. A number of thermostat trips are sensed during at least a portion of a cycle of operation. A water temperature value indicative of a water temperature can be sensed. A calcification level of the heating element or the at least a portion of the water heating assembly can be determined based on the number of thermostat trips and the water temperature value.

A method for generating a scale service alert for a water heater includes calculating an initial bypass mixing percentage of water flowing through a bypass line, associating the calculated initial bypass mixing percentage of water with a detected position of a mixing valve to obtain a baseline feedback measurement, periodically comparing current measurements of the bypass mixing percentage of water and/or a current position of the mixing valve to the baseline feedback measurement, detecting blockages and triggering the scale service alert when the current position of the mixing valve changes by a pre-determined amount from the associated baseline position of the mixing valve to achieve the same bypass mixing percentage of water or when the current measurements of the bypass mixing percentage of water deviates from the initial bypass mixing percentage of water by a pre-determined factor.

A method for generating a scale service alert for a water heater includes calculating an initial bypass mixing percentage of water flowing through a bypass line, associating the calculated initial bypass mixing percentage of water with a detected position of a mixing valve to obtain a baseline feedback measurement, periodically comparing current measurements of the bypass mixing percentage of water and/or a current position of the mixing valve to the baseline feedback measurement, detecting blockages and triggering the scale service alert when the current position of the mixing valve changes by a pre-determined amount from the associated baseline position of the mixing valve to achieve the same bypass mixing percentage of water or when the current measurements of the bypass mixing percentage of water deviates from the initial bypass mixing percentage of water by a pre-determined factor.