Heat Pump Hot Water Services In NZ

There are no regulations that require the energy efficiency of heat pump hot water systems sold in New Zealand and Australia to be tested to a common standard, to carry labels indicating their energy efficiency or other key aspects of performance or to meet any minimum prescribed levels of energy efficiency or performance.

To provide a comparison, Australia does have a Government tested and allocated STC rating, the STC is a rated saving that a hot water system has been granted after testing and approved by the  Australian Clean Energy Regulator,  the number of STC’s that are issued refers to one megawatt hour (1 MWh) of avoided energy consumption over the heat pump hot water system’s deemed life expectancy of a hot water system,  being 10 years.

S =  R – T  where: S: STC count  R: Reference conventional system’s energy consumption (MWh over ten years) T: Tested system’s estimated energy consumption (MWh over ten years).