Patent ID: 7971796

Claim:
A control device for conserving energy for heating water contained in a storage tank and more particularly in a tank ( 2 ) of a water heater ( 30 ) comprising a cold water inlet ( 6 ) and a hot water outlet ( 7 ), said control device comprising: an electronic detection device ( 21 ) for measuring the quantity of hot water remaining in the tank ( 2 ), the electronic detection device ( 21 ) providing a continuous reading of the quantity of hot water remaining in the tank ( 2 ), said electronic detection device ( 21 ) comprising a capillary tube ( 10 ) containing a heat transfer fluid and an amplification device ( 15 ) placed outside the tank ( 2 ) of the water heater ( 30 ) and connected to an electronic control card ( 26 ), said amplification device ( 15 ) being suitable for transmitting a variation in resistance to the electronic control card ( 26 ) under the effect of the expansion of the fluid contained in the capillary tube ( 10 ), and control means ( 50 ) connected to the electronic control card ( 26 ) for determining the hot water consumption profile of the users in order to control the period or periods of resumption of the heating of the water in the tank ( 2 ) of said water heater ( 30 ).