Water heater with multiple condensers

A heat pump water heater comprising:

• a tank with an internal volume to contain heated water and water to be heated, the internal volume being at least partially bounded by a wall of the tank;
• a water inlet to deliver unheated water to the heat pump water heater and a water outlet to remove heated water from the heat pump water heater, the water inlet and the water outlet both being in fluid communication with the internal volume;
• a refrigerant system including a compressor, an expansion device, a low-pressure refrigerant flow path extending between an outlet of the expansion device and an inlet of the compressor, and a high pressure refrigerant flow path extending between an outlet of the compressor and an inlet of the expansion device;
• a first condenser arranged along the high pressure refrigerant flow path to transfer heat from refrigerant traveling the high pressure refrigerant flow path to a flow of water passing through the first condenser;
• and
• a second condenser arranged along the high pressure refrigerant flow path to transfer heat through the wall of the tank from refrigerant traveling the high pressure refrigerant flow path to water within the internal volume,
• wherein the first condenser and the second condenser are arranged in series along the high pressure refrigerant flow path so that all of the refrigerant travelling the high pressure refrigerant flow path passes through both the first condenser and the second condenser.