Heat pump-type heating device

A heat pump-type heating device comprising:

• a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, a motor-operated valve, and a target-side heat exchanger are provided;
• an outdoor fan which is provided for the heat-source-side heat exchanger;
• and
• a controller programmed to control the outdoor fan on the basis of signals obtained by temperature sensors respectively configured to measure a temperature of fluid supplied to the target-side heat exchanger from outside the device and an outside temperature,
• wherein the target-side heat exchanger is capable of heating, by a refrigerant, the fluid supplied from outside the device, and
• wherein the controller is programmed to carry out a rotation number reduction control on the outdoor fan when a difference between the temperature of the fluid supplied to the target-side heat exchanger and the outside temperature is equal to or larger than a predetermined temperature difference, a rotation number of the outdoor fan upon activation of the compressor being smaller than when the difference is smaller than the predetermined temperature difference under the rotation number reduction control.