Heat Pump

How they work

Heat pumps work by extracting heat from the air outside and transferring it into a hot water tank. Then a compressor/condenser/evaporator raises the water temperature using a process that's like a refrigerator working in reverse.

Keep in mind

Although heat pumps are promoted as efficient they have a high purchase and install cost – usually $5 - $6k. It’s a long term investment.
Most heat pump water heaters work best in areas with average air temperatures above 7°C. They can lose efficiency as the temperature outside gets lower, so they are less efficient in winter. A cold day could mean the heat pump needs to run almost continuously to produce any heat.

Hot water heat pumps can be noisy. Make sure to install the external unit away from bedrooms (yours – and your neighbour’s).

A heat pump has many moving parts. A useful lifetime might be expected to be in the range of 5 to 6 to years and maintenance may be required sooner.

In some cases you will need a building consent to install a heat pump water heater. Check with your council.

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