Heat pump water heater

There's a grant available to help with the cost of installing a heat-pump water heater.

In 2009 we tested 6 heat-pump water heaters and found large differences in performance. After our test, the government energy agency EECA ran a pilot scheme where 127 heat-pump water heaters were installed in people’s homes and then performance-monitored.

The pilot scheme results line up remarkably well with our test findings. The Econergy system we recommended was significantly better than the others. It managed on average – over all the country’s climate zones – to produce savings of 60 percent on the water-heating bill in the houses where it was installed. Savings for other models were less.

As a result of lab testing and the in-home monitoring, EECA is now offering a $575 grant towards buying a heat-pump water heater. To be eligible for the grant you must meet the following criteria:

  • You have to choose from a list of eligible systems.
  • The system must be installed in the house you live in most of the time (not a business or holiday home).
  • It must have a building consent if that’s required in your area.
  • A licensed plumber must install the system.
  • The system must be installed before 30 June 2013.
  • Cash-back grants can only be paid to homeowners – not landlords, builders, or developers.
  • The installed system must be new and not second-hand or reconditioned.
  • No other EECA grant can be paid for a water-heating system at the same property.

We say
Take advantage of this offer while it’s available. In our 2009 test we recommended the Econergy HP4000 LT.

More information

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Member Comments


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@ Anna Kramer Posted by: Consumer Staff 13 Jun 2011 2:22pm

We disagree with your comments. We are also well aware of the EECA website.

There have been no significant changes in technology since our test, and the Econergy models remain the only ones to use that particular technology. We also know the Econergy model is suitable for South Island and Central Plateau use because we have test results taken at a temperature of 2 degrees that show the unit performs well at these low temperatures.

We would like to do a new HPWH test - to include any models that are on the market that were not available originally – but for a number of reasons this has not yet been possible.
Hamish Wilson
Research and Testing Manager

Heat pump water heaters. Posted by: Anna Kramer 12 May 2011 7:58pm

Your comments are biased and based on a test that was done 2 years ago.
WE SAY Is not relevant today.

You have not taken into account any of the other brands of the 127 units that was tested under the EECA pilot scheme. All that test information is available at EECA.


I need to inform you that after looking at the EECA website the Econergy unit is not suitable for use in the south island or central platuea, with out a boost element. That energy is not included in the energy savings. The econergy units are a C class. There are A class units in the list that are not as higher energy savings as the econergy unit but they also don't require a boost element and can be installed anywhere in New Zealand.

You need to advise your members or even better do an up to date article on HPWHs. It appears to be very lazy on your part, not looking at the eligable products list on the EECA website and seeing the difference between an A Class and a C Class HPWH

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