Heat pump water heater and control method

A heat pump water heater, comprising a head assembly and a water tank assembly including an electric heating device, the head assembly including:

• a fan;
• a housing having a first vent and a second vent, the first vent being formed in a top wall of the housing;
• a heat pump device including a heat exchanger and a compressor that are disposed in the housing, a first air duct being formed between the first vent and the heat exchanger, and a second air duct being formed between the second vent and the heat exchanger;
• and a control assembly including a second control device, the second control device being disposed in the first air duct and at least partially located directly below the first vent, the second control device being configured to control the electric heating device, and the control assembly being configured to control the fan;
• wherein:
• the fan is configured to form a first airflow flowing from one of the first air duct and the second air duct, through the heat exchanger, to the other one of the first air duct and the second air duct;
• and the control assembly is configured to, based on an operation of the electric heating device, operate the fan.