What's the Average Hot Water Bill in Melbourne in 2026?
The average hot water bill in Melbourne depends on more than the amount of water a household uses. The type of hot water system, household size, energy tariff, system efficiency and access to rooftop solar can all affect the final cost. This guide examines typical water-heating energy costs, explains the factors that influence household expenses and outlines practical ways to reduce the average hot water bill in Melbourne.
What's the Average Hot Water Bill in Melbourne in 2026?
The average hot water bill in Melbourne depends on more than the amount of water a household uses. The type of hot water system, household size, energy tariff, system efficiency and access to rooftop solar can all affect the final cost. This guide examines typical water-heating energy costs, explains the factors that influence household expenses and outlines practical ways to reduce the average hot water bill in Melbourne.
What’s the Average Hot Water Bill in Melbourne?
There is no single average figure that applies to every household. A two-person home using an efficient heat pump on an off-peak tariff may spend considerably less on water heating than a larger household using an electric storage system on a general electricity tariff.
The following figures are based on the latest available official water-heating cost modelling for a two-person Melbourne household using approximately 90 litres of hot water per day.
Hot Water System | System and Tariff | Estimated Annual Energy Cost |
Electric storage | General electricity tariff | Around A$670 |
Electric storage | Off-peak tariff | Around A$535 |
Electric instantaneous | General electricity tariff | Around A$595 |
Natural gas storage | 5-star system | Around A$545 |
Natural gas instantaneous | 5-star system | Around A$430 |
Natural gas instantaneous | 7-star equivalent | Around A$350 |
Heat pump | Higher-efficiency system on an off-peak tariff | Around A$135 |
Heat pump | Higher-efficiency system on a general tariff, without solar PV | Around A$185 |
Solar hot water | Higher-efficiency gas-boosted system | Around A$140 |
Solar hot water | Higher-efficiency electric-boosted system on an off-peak tariff | Around A$155 |
Source: Sustainability Victoria’s water-heating running cost comparison, last updated in July 2025.
* These figures are a guide rather than a guaranteed 2026 bill. They estimate the energy used to heat water and do not include water usage charges, annual electricity or gas supply charges, equipment purchase costs, installation or maintenance.
Energy tariffs may also have changed since the modelling was published. Households should check their current retailer rates before estimating the average hot water bill in Melbourne for their property.
What Makes Up Your Hot Water Costs?
Understanding the difference between running costs and total ownership costs makes it easier to compare hot water systems accurately.
1. Water usage charges
Households pay their local water retailer for the water they consume. Melbourne water retailers include Yarra Valley Water, South East Water and Greater Western Water, and prices can differ between service areas.
Using less hot water can reduce both the volume of water charged and the energy required to heat it.
2. Electricity or gas costs
The energy used to heat water is usually the largest ongoing expense. For electric hot water systems, running costs depend on the system’s energy efficiency, the electricity rate and when the system operates. Depending on the household setup, the system may use electricity charged at a general, controlled-load, off-peak or time-of-use rate. Homes with rooftop solar may further reduce grid electricity use by scheduling a compatible system to run during periods of strong solar generation.
For gas hot water systems, running costs depend on the heater’s energy efficiency, the household’s gas tariff and whether the unit stores heated water or heats it on demand.
3. Electricity or gas supply charges
Official running cost comparisons may exclude daily supply charges. These fixed charges are important when comparing an all-electric home with a home that retains gas only for hot water.
Replacing a gas hot water service will not remove the gas supply charge if the household continues to use gas for cooking or space heating.
4. Purchase and installation costs
The total cost of a new hot water system depends on its capacity, technology and installation requirements. Additional plumbing, electrical upgrades, switchboard work, removal of an old unit or changes to gas connections can increase the final price.
Homeowners should obtain itemised quotes from licensed tradespeople rather than relying on a broad installation estimate.
5. Maintenance and repairs
Maintenance requirements vary by system. Storage tanks, pressure-relief valves, anodes, heat pump components and solar collectors may require different servicing.
Households should follow the manufacturer’s maintenance schedule and use a licensed plumber or qualified technician for work involving plumbing, gas or electrical components.
What Affects the Average Hot Water Bill in Melbourne?
Several factors can influence how much households pay for hot water in Melbourne. Understanding these factors can help homeowners better identify why their bills change over time.
1. Household Size and Hot Water Usage
The number of people living in a home is one of the main factors affecting hot water consumption. Larger households usually require more hot water for showers, laundry, dishwashing, and other daily tasks. As hot water demand increases, the energy required to heat that water also rises, which can lead to higher monthly costs.
2. Energy Prices and Tariffs
Changes in electricity and gas prices can directly affect hot water expenses, especially for households using energy-powered water heaters. Different energy plans and tariff structures may also change the final cost. For example, households using electricity during higher-rate periods may see increased expenses compared with those that manage their usage around available pricing options. Reviewing an Origin hot water bill or energy statement can help households understand how energy usage, tariffs, and hot water consumption contribute to overall hot water costs.
3. Hot Water System Efficiency
The efficiency of your hot water system and household fixtures can affect how much energy is needed to heat and deliver hot water. Older showerheads, taps, poorly insulated pipes, or inefficient systems may increase energy use by requiring more hot water or causing heat loss. Water-efficient fixtures and proper insulation can help reduce unnecessary hot water consumption and improve overall efficiency.
4. Seasonal Changes
Seasonal conditions can affect hot water demand throughout the year. During colder months, households often need more hot water because incoming water temperatures are lower and people may take longer or hotter showers. In warmer seasons, hot water usage may decrease as daily heating needs change.
5. System Settings and Operating Times
An unnecessarily high storage temperature or poorly planned operating schedule may increase energy use. However, households should not lower water temperatures below safe levels without professional advice because stored hot water systems must meet Australian health and safety requirements.
A licensed plumber or qualified technician can check whether the system settings and operating schedule are appropriate.
How Can You Lower Your Hot Water Bill in Melbourne?
Reducing hot water costs does not always require major changes. By adjusting daily habits, improving water usage practices, and managing energy consumption more effectively, households can better control expenses while dealing with rising cost of living pressures.
1. Consider an Energy-Efficient Hot Water System
Older electric resistance or gas systems may use more energy than modern alternatives. Depending on the property, upgrading to a heat pump or solar hot water system can reduce long-term energy consumption.
A heat pump transfers heat from the surrounding air rather than generating all its heat directly through electric resistance. Its performance and savings depend on the climate, installation location, household demand and electricity tariff.
Solar hot water uses roof-mounted collectors to heat water, usually with an electric or gas booster for periods of limited sunlight. Roof orientation, shading, installation costs and available space should be assessed before choosing this option.
2. Use Rooftop Solar More Effectively
Households with rooftop solar may be able to schedule a compatible electric hot water system or heat pump to operate during the middle of the day. This allows more solar electricity to be used directly in the home instead of drawing power from the grid or exporting surplus generation at a lower feed-in rate.
Solar generation does not always align with household energy demand. A home energy storage solution can capture compatible solar input for use later, helping power household appliances after solar production falls or during a blackout. For example, the EcoFlow DELTA 3 Ultra Plus Portable Power Station combines a 3,072Wh battery with 3,600W rated AC output, making it suitable for storing energy and powering compatible plug-in appliances. Its app-based monitoring also allows households to track charging, battery levels and energy use.
For homes with greater energy and backup requirements, the EcoFlow DELTA Pro Ultra Whole-home Backup Battery offers 6kWh of capacity per battery, expandable storage and up to 6,900W AC output under compatible conditions. It combined with the EcoFlow Transfer Switch, can support whole-home backup needs and offer greater flexibility for managing household power requirements. When integrated with suitable solar and connection equipment, it can support broader household energy management and help households use stored energy outside peak solar production periods.
3. Check Available Rebates and Incentives
The Victorian Government provides various rebate programs to encourage households to adopt more energy-efficient hot water solutions. Eligible homeowners may also benefit from federal incentives such as Small-scale Technology Certificates (STCs) and other state-based rebates available in Victoria. These programs can help offset installation costs, making energy-saving upgrades more accessible. Homeowners can also check whether they are eligible for support programs such as the Victorian energy rebate when planning energy-efficient improvements.
4. Review Your Energy Tariff
The most suitable tariff depends on the type of hot water system and when it operates. Controlled-load or off-peak tariffs may suit some electric storage systems, while a time-of-use plan may benefit households that can avoid higher-priced periods.
A lower usage rate does not always mean a lower total bill because daily supply charges, solar feed-in tariffs and other conditions also matter. Compare the complete energy plan rather than focusing on one rate.
5. Maintain the System Regularly
Regular servicing can help a hot water system operate safely and efficiently. Depending on the system, a licensed professional may need to inspect pressure-relief valves, anodes, storage tanks, heat pump components or solar collectors.
Servicing should follow the manufacturer’s instructions. Homeowners should not attempt plumbing, gas or electrical maintenance that requires a licensed trade.
6. Reduce Everyday Hot Water Use
Shorter showers are one of the simplest ways to reduce both water and energy consumption. Installing water-efficient showerheads and taps can provide additional savings without requiring major changes to household routines.
Running dishwashers and washing machines only with full loads and selecting cold-water laundry cycles where appropriate can also reduce hot water demand.
7. Check for Leaks
A leaking hot water pipe, tap or system component can waste both heated water and energy. Some leaks are easy to see, while others may appear as unexplained increases in water or energy use.
If household consumption rises without a clear reason, ask a licensed plumber to inspect the system and check for concealed leaks.
Conclusion
Managing household energy expenses requires a clear understanding of where costs come from and how daily habits affect overall consumption. The average hot water bill in Melbourne can vary depending on household needs, water usage, and the type of hot water system used. By reviewing energy use, exploring available support programs, and considering suitable power solutions, homeowners can make better decisions to control long-term expenses while maintaining reliable hot water access.
FAQs
How much hot water is for 2 people?
For two people, a typical Australian household may use around 90 litres of hot water per day based on average usage estimates. However, actual consumption can vary depending on shower habits, appliance use, and the type of hot water system installed. Households with longer showers or higher hot water demand may need a larger system capacity, while efficient water use can help reduce energy costs.
Why is my water bill so high in Melbourne?
A high water bill in Melbourne can be caused by several factors, including increased household water usage, leaks, seasonal demand, and changes in daily habits. Larger families, frequent outdoor watering, and inefficient fixtures can all contribute to higher consumption. Reviewing your water usage patterns and checking for hidden leaks can help identify unnecessary water waste and reduce future expenses.
Can solar energy help reduce hot water expenses?
Yes, solar energy can help reduce hot water expenses by providing an alternative power source for household hot water systems. During the day, solar systems can generate electricity for daily needs, while excess energy can be stored for later use. By improving energy usage and reducing reliance on traditional power sources, solar solutions can help households better manage long-term hot water costs.