A water heating system is disclosed. The system may include a water heater connected with a utility energy source via one or more circuit breakers. The system may further include a battery and a detection unit. The battery may provide energy to the water heater, and the detection unit may detect water demand associated with the system. The system may additionally include a controller configured to activate the water heater in a first operation mode when the water demand is less than a predefined threshold. The water heater may heat water by using energy drawn from the utility energy source in the first operation mode. The controller may further activate the water heater in a second operation mode when the water demand is greater than the predefined threshold. The water heater may draw energy from the utility energy source and the battery in the second operation mode.

A water heating system is disclosed. The system may include a water heater connected with a utility energy source via one or more circuit breakers. The system may further include a battery and a detection unit. The battery may provide energy to the water heater, and the detection unit may detect water demand associated with the system. The system may additionally include a controller configured to activate the water heater in a first operation mode when the water demand is less than a predefined threshold. The water heater may heat water by using energy drawn from the utility energy source in the first operation mode. The controller may further activate the water heater in a second operation mode when the water demand is greater than the predefined threshold. The water heater may draw energy from the utility energy source and the battery in the second operation mode.

A method for controlling the operation of a gas furnace equipped with one or more secondary electrical power sources is disclosed. The method comprises the steps of switching the gas furnace to a secondary power mode in an event of loss of a primary electrical power source associated with the gas furnace, wherein the gas furnace alternately switches between an ON state for a first prolonged time, and an OFF state for a second prolonged time, at a frequency of an optimized number of cycles per hour.

A method for controlling the operation of a gas furnace equipped with one or more secondary electrical power sources is disclosed. The method comprises the steps of switching the gas furnace to a secondary power mode in an event of loss of a primary electrical power source associated with the gas furnace, wherein the gas furnace alternately switches between an ON state for a first prolonged time, and an OFF state for a second prolonged time, at a frequency of an optimized number of cycles per hour.

An electrical water heater that receives a load shedding request signal uses a temperature sensor that is positioned so as to measure a water temperature in a lower area of a tank of the water heater. A controller continuously determines a salubrity index of the water heater as a function of the temperature measured by the sensor and a time measurement The controller decides to interrupt an electrical power supply of the water heater through a switch so as to interrupt or not interrupt an operation of the water heater upon receipt of the load shedding request signal and only if the salubrity index meets a preestablished criterion.

An electrical water heater that receives a load shedding request signal uses a temperature sensor that is positioned so as to measure a water temperature in a lower area of a tank of the water heater. A controller continuously determines a salubrity index of the water heater as a function of the temperature measured by the sensor and a time measurement The controller decides to interrupt an electrical power supply of the water heater through a switch so as to interrupt or not interrupt an operation of the water heater upon receipt of the load shedding request signal and only if the salubrity index meets a preestablished criterion.

A water heater includes power distribution circuitry receiving primary power and secondary power. The water heater includes a heat exchange system including at least one component powered via the primary power and configured to transfer heat between a refrigerant and water. The water heater includes at least one heater operably coupled with and configured to heat at least one portion of the heat exchange system. The water heater includes switching circuitry electrically interposing the power distribution circuitry and the at least one heater to selectively power the at least one heater via the primary power in a first condition of the switching circuitry and via the secondary power when the primary power is unavailable in a second condition of the switching circuitry.

A water heater includes power distribution circuitry receiving primary power and secondary power. The water heater includes a heat exchange system including at least one component powered via the primary power and configured to transfer heat between a refrigerant and water. The water heater includes at least one heater operably coupled with and configured to heat at least one portion of the heat exchange system. The water heater includes switching circuitry electrically interposing the power distribution circuitry and the at least one heater to selectively power the at least one heater via the primary power in a first condition of the switching circuitry and via the secondary power when the primary power is unavailable in a second condition of the switching circuitry.

A heating medium circulation apparatus promptly detects an overheating abnormality of a heating medium caused by insufficient circulation. The heating medium is pumped by a pump in a predetermined direction in a closed-loop circuit connecting a heater and a heat dissipator. An outgoing temperature and a return temperature of the heating medium flowing out of and into the heater are detected. When a heat dissipation-based operation starts, the pump is activated, and heating is started. Heating is temporarily stopped when the outgoing temperature reaches a heating stop temperature. Heating is resumed when the outgoing temperature falls below a heating resumption temperature. An additional condition that the difference between the outgoing and return temperatures is less than a determination value can be added to the condition for resuming heating. An overheating abnormality is detected when the additional condition remains unsatisfied until a determination time elapses after heating is stopped.

A heating medium circulation apparatus promptly detects an overheating abnormality of a heating medium caused by insufficient circulation. The heating medium is pumped by a pump in a predetermined direction in a closed-loop circuit connecting a heater and a heat dissipator. An outgoing temperature and a return temperature of the heating medium flowing out of and into the heater are detected. When a heat dissipation-based operation starts, the pump is activated, and heating is started. Heating is temporarily stopped when the outgoing temperature reaches a heating stop temperature. Heating is resumed when the outgoing temperature falls below a heating resumption temperature. An additional condition that the difference between the outgoing and return temperatures is less than a determination value can be added to the condition for resuming heating. An overheating abnormality is detected when the additional condition remains unsatisfied until a determination time elapses after heating is stopped.