Water heater and control method therefor
First Claim
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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Accused Products
Abstract
A water heater includes one or a plurality of heat pumps that heat tap water or return water from a hot water supply part, a circulation line that supplies hot water heated in the heat pumps to the hot water supply part, and introduces the return water from the hot water supply part to the heat pumps, an incoming water pipe that joins to between the hot water supply part in the circulation line and the heat pumps and supplies the tap water, a circulation pump that returns the return water to the heat pumps and circulates the return water through the circulation line, and a control unit that controls operation or stop of the circulation pump according to driving operation time or elapsed stop time by linking a combustion process of the heat pumps.
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Citations
11 Claims
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1. A water heater comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A water heating control method, comprising:
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heating tap water or return water by one or a plurality of heat exchangers with combustion heat generated by combustion of a burner, the return water being from a hot water supply part; supplying the tap water or the return water, which is heated by the heat exchangers, to the hot water supply part, and circulating the return water from the hot water supply part through the heat exchangers via a circulation line by a circulation pump; supplying the tap water to the circulation line by joining the tap water to the circulation line between the hot water supply part and the heat exchangers; and linking the combustion of the burner to operation of the circulation pump, calculating 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, starting 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 stopping the operation of the circulation pump and the combustion of the burner when a predetermined time of the thermal process has passed. - View Dependent Claims (9, 10, 11)
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Specification