Water heater requirements
South Australia has water heater requirements that may affect the type of water heater you can install in a home and the water efficiency of showers serviced by the water heater. The requirements are designed to improve the energy efficiency of homes and lower greenhouse gas emissions.
The requirements mean that for most homes:
- low greenhouse gas emission (low emission) water heaters are installed, such as high efficiency gas, solar or electric heat pump water heaters
- shower outlets connected to the installed water heater must have a water efficient shower head or flow restrictor.
The requirements apply to installing new water heaters or replacing old water heaters. Working water heaters do not need to be replaced.
South Australia’s water heater installation requirements have been in place since 2008 and were last reviewed and updated in 2014. The review was informed by technical research and economic modelling, as well as consultation with a range of stakeholders. See the final report: Review of South Australia's Water Heater Installation Requirements .
For more information about the review, please email email@example.com.
Installing a water heater
Only licensed plumbing contractors or registered plumbing workers can install water heaters. You can check that your installer has a license to do plumbing work via the licensing public register.
Installing an eligible solar or electric heat pump water heater entitles you to small-scale technology certificates (STCs). See Assistance with purchase costs for more information. The number of STCs a system is entitled to create depends on its installation and geographic location. South Australia falls into geographic zones 3 and 4.
Find out which water heater can be installed
Work through the decision maker below to find out which water heater can be installed at a home under the requirements. Visit the Australian Government’s YourHome website if you’d like to know more about different types of water heaters – including electrical, gas and solar hot water systems – and how they work.
If you are repairing an existing water heater, replacing a single faulty component in an existing solar or heat pump water heater, or replacing a water heater under warranty, these requirements don’t apply.
Class 1A: Single detached dwelling or two or more attached dwellings separated by a fire-resistant wall, including a maisonette, row house, townhouse, and single-storey flats or units.
Class 1B: Boarding/guest house or hostel not exceeding 300m2 with no more than 12 residents.
Class 2: Multi-storey building containing two or more sole-occupancy units, where each is a separate dwelling.
The Office of the Technical Regulator may grant exemptions from the requirements on a case-by-case basis where extreme technical difficulties are shown.
Low emission water heaters
|Type of water heater||Requirements|
Solar – electric boosted
Electric heat pump
You can install a water heater that meets either of these zone requirements anywhere in the state:
220 litres or less rated hot water delivery:
220 litres and less than 400 litres rated hot water delivery:
400 litres or more and less than 700 litres rated hot water delivery:
Gas instantaneous or storage – bottled or mains
Must have an energy rating of at least 5 stars.
A gas water heater installed entirely within a fully enclosed roof space, room or attached garage of an established home must have an energy rating of 3 stars or more. This option is not available for water heaters installed as part of building work that requires development approval.
Solar – gas boosted
Eligible for 1 or more STC.
Solar – wood boosted
Any water heater can be installed.
Any water heater can be installed.
How to determine if an electric boosted solar or heat pump water heater meets the requirements
Find out the number of STCs for a particular brand and model in zones 3 and 4 by:
- searching the Clean Energy Regulator's register for solar and electric heat pump water heaters
- checking with the water heater manufacturer.
Check the table above to find out the minimum number of STCs a water heater needs, based on tank volume, in Zone 3 and in Zone 4. You can then compare the water heater's STCs for Zone 3 and for Zone 4 with the minimum requirements. Only one of the two zone requirements needs to be met, ie either the Zone 3 or the Zone 4 requirement. It doesn’t matter which zone the water heater is installed in.
Question: does a 300-litre electric heat pump water heater that is eligible for 26 STCs in Zone 3 and 26 STCs in Zone 4 meet the requirements in this table?
Answer: while the electric heat pump water heater does not meet the Zone 3 requirement (27 STCs or more) it does meet the Zone 4 requirement (26 STCs or more) and can be installed anywhere in the state.
Water flow rate requirements
When installing a new or replacement water heater in a home, any shower outlets connected to the water heater must have a flow rate of nine litres per minute or less. This means you may also need to install water efficient shower heads or flow restrictors that have no less than a three star rating under the water efficiency labelling and standards (WELS) scheme.
If you already have shower outlets with three star rated shower heads, no change is needed.
Most new water heaters are compatible with water efficient shower heads, but check with the manufacturer if you are unsure.
Gravity fed water heaters meet the water flow rate requirements, meaning water efficient shower heads or flow restrictor don’t need to be installed.
These water flow rate requirements do not apply if your water heater installation is exempt from the water heater requirements.
Where to find detailed technical requirements
Details of the requirements for new homes, alterations and additions are in the National Construction Code Volume Three – Plumbing Code of Australia.
Details of requirements for established homes are in the South Australian water heater installation requirements .
Plumbers can contact the plumbers' water heater information line on 1300 883 019 (Monday to Friday, 9am–5pm) for assistance.
Householders can ask their licensed plumber or building contractor for assistance with code requirements or contact the Energy Advisory Service for more information.