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Control unit for controlling the temperature of a domestic water supply

  • US 5,556,564 A
  • Filed: 05/02/1995
  • Issued: 09/17/1996
  • Est. Priority Date: 05/02/1994
  • Status: Expired due to Fees
First Claim
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1. A control unit for controlling the temperature of a domestic water supply, the control unit comprising:

  • an electrical immersion heater for inserting into a water tank so as to heat substantially all the water therein;

    a set means accessible to a user of the domestic water supply for setting a desired water temperature and producing a corresponding set signal;

    a source of electrical power for supplying electricity to the immersion heater; and

    a controllable switch connected between the source of electrical power and the electrical immersion heater, and being responsive to a sensor signal and to the set signal for closing if the actual water temperature is lower than the desired water temperature and for opening if the actual water temperature is greater than the desired water temperature;

    wherein;

    at least two temperature sensors are provided for inserting into the water tank at different predetermined heights thereof so as to produce corresponding sensor signals each representative of actual water temperature of a corresponding fractional volume of water in the tank, anda display is coupled to each temperature sensor and is responsive to the corresponding sensor signal produced thereby for displaying a representation of the actual water temperature of the corresponding fractional volume of water in the tank.

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