Water heater and method for controlling the same

A water heater connected to an outdoor unit through first and second refrigerant lines, the outdoor unit including an outdoor heat exchanger that exchanges heat with air, the water heater being connected to a hot water use place to supply hot water through first and second water lines, the water heater comprising:

• an electronic component unit provided with control components;
• a compressor configured to compress a refrigerant;
• a condenser provided on an outlet side of the compressor and configured to perform heat exchange between a refrigerant passage through which the refrigerant compressed in the compressor flows and a water passage through which water transferred from the hot water use place flows;
• a condenser outlet pipe extending from an outlet side of the condenser;
• a cooling pipe installed in the condenser outlet pipe and configured to supply the refrigerant so as to cool the electronic component unit;
• and
• an evaporator disposed on an outlet side of the cooling pipe and configured to perform heat exchange between a first refrigerant passage through which the refrigerant passing through the cooling pipe flows and a second refrigerant passage through which the refrigerant transferred from the outdoor unit flows.