Heat pump hot water systems run on electricity but are around three times more efficient than a conventional electric water heater. They sit on the ground so don’t require roof space.
Heat pumps can operate in most climates but are most efficient in hot and humid conditions and least effective in very cold climates. They make a low humming sound similar to an air conditioner which should be taken into account when deciding on their location.
Research your requirements
- Find out the best type of hot water system for your household - either a solar, gas or heat pump hot water system. Consider your household size, available energy sources, your climate, space and access, and your existing system.
- You should also consider purchase and installation costs, as well as running costs for different systems. Don’t forget to include potential long term energy savings and reduced greenhouse gas emissions in your decision making.
- Make sure that you understand what electricity tariff will apply to your new hot water service.
- If you decide on a heat pump hot water system, it’s important to choose the most appropriate one for your needs as there are different types available.
- Consider whether your system needs an electric booster.
- Talk to your installer or supplier about Small-scale Technology Certificates (STCs). An STC is a measure of renewable energy which can be traded for cash or a discount on the purchase price of solar or heat pump hot water systems.
- If you are looking at particular systems or models, you will often be able to research them online.
- For further details and resources about the different types of systems available and how they work, see ‘Further information’ below.
Contact installers
- Seek expert advice about your options and get several written quotes to make sure you get the best system for your needs at the best price. You can speak to installers, building information centres, designers or retailers for advice.
- Check your installer is accredited. Qualified installers will be aware of safety issues and will install systems correctly.
- Ask installers about any additional costs that may not be included in the quote.
- If you are in a frost-prone climate, make sure your system is appropriate for the conditions.
- Ask about the warranty and after-sales service and what help you'll get if you have questions about your installation in the future.
Install your heat pump hot water system
- Be aware that installation can take a day or two to complete. Installers may need access to your roof and will need to turn off water, gas and electricity during the installation.
- Talk to your installer about the best place to locate your system. Installing it in a warm location is important for efficient operation, particularly in cooler climates. Position it as close to laundries and bathrooms if possible to minimise pipe work and heat loss.
- Make sure your pipes are insulated.
- If you have a booster control, make sure it’s in an accessible location and has an indicator light you can see from inside to remind you to turn it off when not needed.
- If your system has an electric booster, the person doing the electrical work must be licensed to undertake this work.
- While your installer is on site, make sure you have all the information and paperwork necessary to lodge an application for any rebates you may be eligible for and renewable energy certificates.
- Request a Certificate of Compliance from your installer so you can be confident your new water heater meets all regulatory requirements.
Operate and maintain your system
- Before your installer leaves, make sure you have clear instructions on how to operate your system and what maintenance is required. Follow the manufacturer’s maintenance recommendations.
- Talk to your installer about having your hot water system regularly inspected and serviced.
- Set the temperature of the storage tank to at least 60°C to kill bacteria. Don’t overheat the water as this wastes energy.
- If you have a booster, make sure you turn it off when going on holidays. Consider turning off the booster during summer if conditions are favourable.
