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.
Definitions
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.
At URL provided, select the '2022 Electric storage water heaters sales and efficiency data' Excel file.
This spreadsheet was reformatted for easier processing.
From the dataset Energy Savings Under The E3 Programme: Electric storage water heaters 2022, this data was extracted:
Sheet: Energy savings
Range: C3:E22
Provided: 60 data points
Dataset originally released on:
November 23, 2022
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.