Outdoor unit and heating and ventilation apparatus

An outdoor unit, comprising:

• an outdoor unit housing having a fan chamber, a compressor chamber, and a water circuit chamber that are arranged sequentially in a left-right direction;
• an outdoor heat exchanger and an outdoor fan that are disposed in the fan chamber;
• a compressor assembly disposed in the compressor chamber and comprising a compressor;
• a water circuit heat exchange assembly comprising a water circuit heat exchanger and a water pump, wherein the water circuit heat exchanger has a water flow path and a refrigerant flow path that are capable of exchanging heat with each other, wherein at least the water circuit heat exchanger and the water pump of the water circuit heat exchange assembly are disposed in the water circuit chamber, and wherein the water pump is configured to drive water in the water flow path to flow;
• a first electrical control box part disposed between the fan chamber and the compressor chamber;
• and
• a second electrical control box part disposed in the water circuit chamber.