Heat pump water heater

A heat pump water heater comprising:

• a tank including an input port, through which water is input to an interior cavity of the tank, and an output port, through which water is discharged from the interior cavity;
• a first condenser configured to heat an upper portion of the interior cavity, wherein the first condenser includes first and second ports;
• a second condenser configured to heat a lower portion of the interior cavity, wherein the second condenser includes a first port, and a second port, which is fluidically coupled to the second port of the first condenser;
• a heat pump configured to drive a fluid in a heated state through a heat pump output and receive the fluid through a heat pump input;
• valving having a first valve setting, in which the heat pump output is fluidically coupled to the first port of the first condenser and is fluidically disconnected from the first port of the second condenser, and the heat pump input is fluidically coupled to the first port of the second condenser, and a second valve setting, in which the heat pump output is fluidically coupled to the first port of the second condenser and is fluidically disconnected from the first port of the first condenser, and the heat pump input is fluidically connected to the first port of the first condenser;
• and
• a controller configured to selectively direct the valving to the first or second valve setting,
• wherein:
• when the valving is in the first valve setting the fluid is driven from the heat pump output to the first port of the first condenser, from the first port of the first condenser through the first condenser to the second port of the first condenser, from the second port of the first condenser to the second port of the second condenser, from the second port of the second condenser through the second condenser to the first port of the second condenser, and from the first port of the second condenser to the heat pump input;
• and
• when the valving is in the second valve setting the fluid is driven from the heat pump output to the first port of the second condenser, from the first port of the second condenser through the second condenser to the second port of the second condenser, from the second port of the second condenser to the second port of the first condenser, from the second port of the first condenser through the first condenser to the first port of the first condenser, and from the first port of the first condenser to the heat pump input.