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Water heater and control method therefor

  • US 9,182,159 B2
  • Filed: 10/14/2010
  • Issued: 11/10/2015
  • Est. Priority Date: 10/14/2010
  • Status: Active Grant
First Claim
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1. A water heater comprising:

  • one or a plurality of heat exchangers that heat tap water or return water with combustion heat generated by combustion of a burner, the return water being from a hot water supply part;

    a circulation line that supplies the tap water or the return water, which is heated by the heat exchangers, to the hot water supply part, and circulates the return water from the hot water supply part through the heat exchangers;

    an incoming water pipe that joins the circulation line between the hot water supply part and the heat exchangers, and supplies the tap water to the circulation line;

    a circulation pump that circulates the return water through the circulation line; and

    a control unit that links the combustion of the burner to operation of the circulation pump, calculates a flow rate for supplying the hot water required for a thermal process after a predetermined time has passed since hot water supply had been ended by shut-off of an opening and shutting faucet that is set on the circulation line, starts the operation of the circulation pump and the combustion of the burner, the combustion corresponding to a quantity of heat for making the return water, which flows at the flow rate, a predetermined temperature, and stops the operation of the circulation pump and the combustion of the burner when a predetermined time of the thermal process has passed.

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