For Victorian homeowners comparing heat pump vs gas hot water, running cost is often the biggest difference.
A well-sized heat pump uses less energy than gas hot water in many homes. It can save even more when you have rooftop solar. The benefit may also grow if hot water is your last gas appliance.
Upfront cost still matters. A heat pump may cost more to install before rebates. Electrical work, plumbing changes and the installation area can all affect the quote.
A fair heat pump vs gas hot water comparison should include:
Timing matters too. From 1 March 2027, most failed gas hot water systems in existing Victorian homes must be replaced with an efficient electric option if they can’t be repaired.
Planning early gives you more time to compare quotes, check rebates and choose the right location.
This table gives you a quick heat pump vs gas hot water comparison.
| Factor | Heat pump hot water | Gas storage | Continuous-flow gas |
| Energy source | Electricity | Gas | Gas |
| Estimated yearly energy cost for four people | About $275 to $435 without solar | About $740 to $820 | About $555 to $685 |
| Cost with rooftop solar | About $35 to $115 with daytime use | No solar benefit | No solar benefit |
| Upfront cost | Often higher before rebates | Can be lower for a simple replacement | Depends on the unit and gas supply |
| Hot water supply | Stored in a tank | Stored in a tank | Heated when needed |
| Space needed | Tank and compressor | Storage tank | Usually wall mounted |
| Fixed gas charge | May be removed if no gas appliances remain | Remains | Remains |
| Main checks | Tank size, power, noise, airflow and drainage | Flue, gas supply and ventilation | Gas pressure, flow rate and demand |
| 2027 replacement rules | Suitable electric option | Restricted for most failed systems | Restricted for most failed systems |
The figures give you a useful starting point, but every home is different. A tailored heat pump vs gas hot water assessment should also check your tariffs, current appliance, household demand and installation needs.
Your result will depend on your tariff, water use, climate and chosen system.
The main heat pump vs gas hot water difference is how each system creates heat.
A heat pump hot water system moves heat from the surrounding air into a storage tank.
It works in a similar way to a reverse-cycle air conditioner. Instead of heating a room, it heats water.
A heat pump transfers existing heat. It doesn’t create all its heat through an electric element. This helps it use less power than a standard electric storage system.
Victorian Government guidance says heat pumps can use around 60% to 75% less electricity than conventional electric hot water systems.
Two main types are available:
The right type depends on space, airflow, noise and pipe length.
A gas storage system uses a burner to heat water in a tank.
The burner turns on when the water cools or new cold water enters. Energy is also used to keep the stored water hot.
Heat can escape from the tank and pipes. These losses add to the running cost.
A continuous-flow unit heats water when you open a tap.
It doesn’t store water, so there is no tank heat loss. However, its performance depends on flow rate and demand.
A unit may handle one shower well but struggle when several outlets run at once.
The upfront heat pump vs gas hot water price depends on the home and installation.
A heat pump job may need:
A simple gas replacement may cost less when the existing pipes, flue and base can be reused.
That isn’t always possible. Gas pressure, ventilation and compliance work can raise the cost.
Avoid comparing a full heat pump quote with the shelf price of a gas appliance. Compare the complete installed cost for each option.
Ask for a written quote that shows:
A clear heat pump vs gas hot water quote makes it easier to compare installers.
In many Victorian homes, yes. Government modelling estimates that a four-person household may spend $275 to $435 a year running a heat pump without solar. Gas storage may cost $740 to $820. Continuous-flow gas may cost $555 to $685.
These are modelled figures, not quotes.
They assume four people in Melbourne using around 150 litres of hot water each day. They don’t include the daily gas supply charge.
Your heat pump vs gas hot water running cost will depend on:
The Victorian Energy Upgrades program says an eligible gas-to-heat-pump upgrade may save around $400 a year. Actual savings can differ.
Consider a Melbourne family of four.
The modelled yearly costs are:
Over ten years, the estimated energy savings are:
These figures don’t include the purchase price.
Suppose the heat pump costs $2,000 more after rebates. The simple payback may be:
This heat pump vs gas hot water example is a guide only. Your quote, tariff and water use will change the result.
A gas bill includes the gas you use and a daily supply charge.
Replacing gas hot water won’t remove this fee if you still use gas for heating or cooking.
The saving becomes larger when hot water is your final gas appliance. Closing the gas account may avoid about $350 to $400 a year in supply charges.
Gas connection removal fees may apply. Check these costs with your retailer and distributor.
Use this simple heat pump vs gas hot water calculation:
Installed price after rebates
+ energy costs over five or ten years
+ gas supply charges
+ servicing costs
+ connection or disconnection fees
This gives you a better answer than the appliance price alone.
Rooftop solar can improve the heat pump result.
Many heat pumps include a timer. You can set the unit to heat water during the day when your solar panels are producing power.
The tank then stores hot water for later use.
This can reduce the amount of electricity bought from the grid. It may also provide more value than exporting solar at a low feed-in rate.
A good heat pump vs gas hot water solar assessment should review:
A timer can’t fix a tank that’s too small. The system must meet peak household demand first.
Household size is only a starting point.
Four people taking short showers may use less hot water than two people with long showers and a large bath.
Teenagers, visitors and shift workers can also change demand.
An installer should ask about:
A tank that’s too small may run out of water. It may also use the electric booster more often.
A tank that’s too large can cost more to buy and keep hot.
Correct sizing can decide whether your heat pump vs gas hot water upgrade works well in daily use.
A suitable system still needs a suitable location.
The compressor makes sound while the heat pump runs. The noise level varies between models.
Avoid placing it beside:
Check the published sound rating for the exact model.
A heat pump needs a suitable power supply.
Some homes need a dedicated circuit. Older homes may also need switchboard work.
Your quote should state whether this work is included.
The compressor needs clear airflow.
Installers also need space to fit and service the unit. An old gas tank location may not meet the new clearance or drainage needs.
Victorian winters don’t rule out a heat pump.
However, models perform differently in cold weather. Check the minimum operating temperature before buying.
A model used in Melbourne may not suit a colder regional town.
The installer should explain how each heat pump vs gas hot water option will perform in winter.
Water heating can account for 15% to 30% of household energy use. It can also produce up to 25% of emissions from an average Australian home.
Sustainability Victoria’s four-person model estimates ten-year emissions of:
The heat pump vs gas hot water emissions gap may grow when the heat pump uses rooftop solar.
A heat pump still has manufacturing and refrigerant impacts. It shouldn’t be described as emission-free.
Eligible households may combine the Solar Homes rebate with a Victorian Energy Upgrades discount.
As at 22 July 2026, the Solar Homes rebate covers up to 50% of the eligible product price after other discounts.
The caps are:
The current VEU discount for replacing gas hot water with a heat pump is up to $560.
This creates a combined gas-replacement maximum of:
Higher combined figures may apply when an inefficient electric system is replaced. They aren’t the standard gas-replacement amounts.
Your heat pump vs gas hot water quote should show the exact rebate and discount applied.
You may qualify when:
The income cap changed from $210,000 to $150,000 on 1 July 2026.
VEU has separate rules. Private rental properties may also qualify.
Rebates aren’t guaranteed. Government rules, product lists and certificate values can change.
For a planned job:
Don’t pay a non-refundable deposit before approval.
A different process may apply when the existing system has failed or become unsafe.
An authorised retailer may install an eligible unit before approval. You must apply as soon as possible after the work.
Approval isn’t guaranteed. You will pay the full price if the application fails.
A heat pump may suit your home when:
A gas replacement may still appear cheaper before 1 March 2027. This can happen when the existing setup is easy to reuse.
However, a new gas unit may keep you paying gas use and supply charges for years.
Get property-specific advice when:
Your final heat pump vs gas hot water choice should meet peak demand at the lowest practical ownership cost.
Smart Upgrades supplies and installs heat pump hot water systems for Victorian homeowners and landlords.
The team can assess your:
A property visit turns a general heat pump vs gas hot water comparison into a quote based on your home.
Smart Upgrades can prepare a property-based heat pump vs gas hot water comparison before you choose a replacement. This helps you compare the final installed price, likely running costs, rebate eligibility and practical site requirements.
Before accepting a quote, confirm the model, warranty, scope, rebates and final payment in writing.
In many homes, yes. Government modelling estimates yearly heat pump costs of $275 to $435 for four people without solar.
Gas storage may cost $740 to $820. Continuous-flow gas may cost $555 to $685.
The heat pump vs gas hot water saving can grow when you use rooftop solar or close the gas account.
A two-to-four-person household may spend about $185 to $435 a year on heat pump hot water.
A four-person home using rooftop solar and daytime controls may spend about $35 to $115.
Your tariff, water use and system settings will affect the result.
Yes. Eligible owner-occupiers may receive up to $1,000 through Solar Homes.
An eligible locally made product may receive up to $1,400.
An eligible gas replacement may also receive a VEU discount of up to $560. This gives a combined maximum of $1,560 or $1,960.
Payback depends on the extra installed cost and annual savings.
In the example above, a heat pump costing $2,000 more may recover the difference in about four years compared with gas storage.
The period may be about seven years compared with efficient continuous-flow gas. Rooftop solar can shorten the result.
Yes. A heat pump can still cost less to run without solar.
Solar improves the saving, but it isn’t required. Installation cost, household demand, tariffs and gas supply charges still matter.
Get a free, no-obligation heat pump vs gas hot water assessment before your current system fails.
Provide your postcode, existing hot water type, household size, solar details and preferred replacement date.
Smart Upgrades can inspect the property, explain possible incentives and prepare a tailored installation quote.
Call Smart Upgrades on 1300 998 769 or submit an upgrade request through the Smart Upgrades website.
