Comparing Hot Water Running Costs In Victoria

Rinnai Infinity 32 gas hot water system

When it comes to hot water systems in Australia there are a few different options.

Heat pumps have gained popularity over the last few years, however there are a few things to consider before changing your current hot water system.

The most common types of hot water systems in Australia are:

  • Gas or Electric storage tank
  • Gas or Electric instantaneous
  • Solar gas boosted
  • Solar electric boosted
  • Electric heat pump

The best option for your household will depend on a few factors including:

  • The number of people in your household
  • How you use hot water
  • Your energy tariffs
  • Climate where you live
  • Efficiency of the system
Rinnai Heatpump

According to data released from Sustainability Victoria in January this year, a high efficiency solar with gas booster hot water system is the most economical to run. It also has the added advantage of having the lowest Greenhouse Gas emissions over a 10-year period compared to any of the other options listed above.  

Sustainability Victoria have calculated estimated annual energy costs and 10-year greenhouse gas emissions for the various types of hot water systems for 1 person to 4 person households. They have compared high efficiency models with standard for each hot water system type as well as for peak and off-peak tariff options. If you’re unsure which system is going to be best for your household, Immerge Group can help.

Rinnai solar hot water panels

High efficiency heat pumps come in second according to Sustainability Victoria, however reviewing your current tariff from your electricity retailer will enable you to make an informed decision about the likely savings you could expect.  Electric heat pumps use significantly less electricity than an electric storage or electric instant hot water system. So, if gas is not available at your property, upgrading to an electric heat pump could save you money on your electricity bill. 

Rinnai offers high efficiency electric heat pumps ranging in size from 180l to 315l, so there will be an option to suit you. To learn more about Rinnai’s heat pumps click here.

If you’re planning or currently building a new home, opting for a solar gas boosted system is likely going to be your most cost-effective choice in the long run. The upfront price is higher compared to some of the other options, but the long-term savings on your energy bills and lower Greenhouse Gas emissions make it a great option when building a new home.


The Victorian government offers rebates through its Solar Victoria program. If you’re eligible, changing over from your existing inefficient hot water system to a new system from their approved products list could save you \$1,000 on the installation cost. To find out more information and check your eligibility click here.

Rinnai Gas boosted hot water system

If price is a concern, or you don’t have suitable roof space for solar panels, an instantaneous gas system is a great option. If you have an existing instantaneous gas hot water system, replacing it with the latest model is a simple and quick process. Rinnai has many different high efficiency modes on offer at various price points. To find out more about how they work click here

Immerge Group can help you make an informed decision when it comes time to replace your current hot water system. We will advise the most suitable type and size hot water system for your household based on your needs. We can supply and install all Rinnai hot water systems at competitive prices, and we are an authorised retailer for the Solar Victoria program.  

Give us a call on 03 9796 3725 and speak to one of our knowledgeable team members to compare your options today.

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