Energy Efficiency - Electric storage water heaters sold by heat loss and nominal capacity 2002–2021

Energy Efficiency and Conservation Authority


Increase in heat loss over time is a result of an increase in the sales of products which do not meet NZ MEPS, but can be sold under the Trans-Tasman Mutal Recognition Agreement.


Heat loss: heat lost through the walls of the storage tank while water is being heated, given tank insulation.
Sales weighted: Average is weighted proportionally to the sales of units.

Data calculation/treatment

Annual energy consumption is based on assumed yearly usage.
The average is sales-weighted, which means it depends on the energy efficiency of units that were actually sold.

For more information

Data provided by

Energy Efficiency and Conservation Authority

Dataset name

Energy Savings Under The E3 Programme: Electric storage water heaters 2021


How to find the data

At URL provided, select the '2021 Electric storage water heaters sales and efficiency data' Excel file.
This spreadsheet was reformatted for easier processing.

Import & extraction details

File as imported: Energy Savings Under The E3 Programme: Electric storage water heaters 2021

From the dataset Energy Savings Under The E3 Programme: Electric storage water heaters 2021, this data was extracted:

  • Sheet: Energy savings
  • Range: C3:E21
  • Provided: 57 data points

Dataset originally released on:

October 01, 2021

About this dataset

Through the Equipment Energy Efficiency (E3) Programme, New Zealand and Australia develop common energy efficiency measures to regulate the energy performance of products in both countries.
Suppliers of products regulated under the E3 Programme provide Energy Efficiency and Conservation Authority with annual sales data for the period of 1 April to 31 March. This is used to help measure the shift in product efficiency over time and to calculate the energy savings to date from these improvements in energy efficiency.

Purpose of collection

The Equipment Energy Efficiency Programme is run by the Commonwealth state and territory and New Zealand governments working with industry to drive improvements in the energy efficiency of appliances and equipment to save households and businesses money on their energy bills reduce energy use and reduce emissions.

Method of collection/Data provider

The measures developed through the E3 Programme are minimum energy performance standards (MEPS) and the Energy Rating Label.