A heat pump water heater is like a reverse refrigerator. Here's a quick summary of what a heat pump water heater is, and how heat pump water heaters work.
There has been a noticeable hype around heat pumps. For instance, Elon Musk believes that heat pumps hold the key to a renewable energy-dominant future. Water heaters that use heat pumps (heat pump water heaters) have also witnessed sudden popularity. Here’s all the basics you need to know about them.
Heat pumps are devices that move heat. They use some energy (usually electricity) to move heat from one place to another.
Imagine two rooms. Room A is hot. Room B is cold. If there was a heat pump between the two units, it would move heat from Room A to Room B. Room A would become cooler, while Room B would become hotter.
Heat pump water heaters use heat pump technology to heat water.
Regular water heaters would generate heat: by combusting a fuel (natural gas/propane) to light a flame that heats cold water, or by making an electric resistance coil hot with electricity.
On the other hand, heat pump water heaters do not generate any heat. Instead, they move pre-existing heat from another source (like surrounding air) to cold water. Since they do not generate any heat, they typically use far lesser energy.
An air source heat pump water heater moves heat from surrounding air to cold water. As a result, the surrounding air gets cooler while the water gets hotter.
As mentioned earlier, heat pump water heaters move heat from one source to cold water. How is heat moved though? Let’s look at how an air source heat pump water heater works:
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