Power management controls for electric appliances

A power management system for controlling the electrical power to a tankless hot water heater having a plurality of on demand heating elements in a building, the power management system comprising;

• a microprocessor;
• at least one current flow sensor in electrical communication with the microprocessor, the at least one current flow sensor adapted to measure the amount of electrical current available to the building as well as the actual current flowing through the building;
• an inlet water temperature sensor, an outlet water temperature sensor and a flow sensor in electrical communication with the microprocessor, the inlet water temperature sensor, the outlet water temperature sensor and the flow sensor adapted to measure the load requirements of the tankless hot water heater;
• or more triacs in electrical communication with the microprocessor, the one or more triacs adapted to control the power flowing to the plurality of heating elements of the tankless hot water heater;
• the microprocessor maintaining a record of the information from the inlet water temperature sensor, the outlet water temperature sensor, the flow sensor and the one or more current sensors, the microprocessor having predetermined a electrical maximum limit and a continuous load limit which is 80% of the electrical maximum limit for the building, the microprocessor using the one or more triacs to average a continuous load over three hours which is less than the continuous load limit for said building while never exceeding the electrical maximum limit for said building.