Water heater enabled to respond to grid conditions

Water heater powered by energy from a power grid, the water heater comprising:

• a vertical development storage having an upper portion and a bottom portion to which are associated respective upper temperature sensor and bottom temperature sensors and at least one respective upper heating element and bottom heating element, adapted to heat the liquid in the storage,
• an interface for selecting one of at least two heating modes (Comfort, I-memory, Green, Fast, I-memory green, I-memory fast) differing from each other by control logic of the heating elements and which are configured to reach a thermostating temperature Ttarget that is one of a user set temperature Tset, or a temperature threshold Thp of a heating element which is a condenser of a heat pump or an optimised temperature Tmem,
• a regulator of the heating elements, adapted to receive readings from the temperature sensors the selected heating mode (Comfort, I-memory, Green, Fast, I-memory green, I-memory fast) and to implement the control logic of the heating elements according to the selected heating mode,
• wherein the regulator is configured to modify the control parameters of the heating elements in response to a detected and/or estimated and/or expected condition of energy scarcity or surplus of the grid and the behaviour resulting from a response to a grid condition is a function of both the power grid condition and the heating mode selected by the user, the water heater characterised in that the regulator is further configured to modify the control parameters thereof according to a condition selected among one of scarcity or surplus condition of electrical energy and to the selected heating mode for at least some scarcity and abundance grid conditions so that at least some of the heating elements are still controlled at a thermostating temperature to be reached.