Abstract: A heat pump that uses solar heat as an evaporation heat source of a refrigerant. The heat pump includes a solar heat collector, a compressor to compress a refrigerant, a first heat exchanger to condense the refrigerant compressed by the compressor and to perform heat exchange between the condensed refrigerant and water, a second heat exchanger to perform heat exchange between the refrigerant having passed through the first heat exchanger and heat collected by the solar heat collector, a third heat exchanger to perform heat exchange between the refrigerant having passed through the first heat exchanger and external air, and a first flow channel switching valve to allow the refrigerant having passed through the first heat exchanger to selectively flow to the second heat exchanger or the third heat exchanger therethrough.

Abstract: Disclosed are a heat pump boiler and a control method for the same. The heat pump boiler includes an outdoor unit having an outdoor-unit heat-exchanger, a water pipe including a water-feed pipe and a water-return pipe connected to the outdoor unit to feed water to the outdoor unit or to return low-temperature or medium-temperature water produced in the outdoor unit to an external location, heat exchangers connected to the water pipe to produce medium-temperature or high-temperature water, a variable-capacity compressor connected to the heat exchangers, a buffer tank connected to the water pipe, and an externally-wound heat exchanger to collect waste heat radiated from the compressor. A temperature of water stored in the buffer tank is raised using the collected waste heat, and, during a defrosting operation, the water stored in the buffer tank is fed to the outdoor-unit heat-exchanger to defrost an evaporator of the outdoor unit.