0420 102 198
Hot Water System Replacement Cost in Melbourne (2026): Gas, Electric, Solar & Heat Pump Compared
A simple guide to hot water system replacement costs in Melbourne for 2026, comparing gas, electric, solar and heat pump systems for local homes.
Given the current cost-of-living, we know that costs are always top of mind when it comes to household plumbing. If you’ve been wondering how much it might cost to get a hot water system replaced in Melbourne, we’re here to help.
Whether you’ve just moved into a new home or need to replace an older unit, this blog will provide a little guidance and advice.
When Should I Get My Hot Water System Replaced?
Already decided to move on from an older hot water unit? If so, feel free to skip ahead. If not, here are some of the signs it just might be time to get the ball rolling:
- > System is 8–12+ years old
- > Inconsistent hot water supply
- > Hot water running out too quickly
- > Leaks around the unit
- > Strange noises coming from the system
- > Rusty or discoloured water
- > Consistently high energy bills
- > Transitioning from gas to electric
Of course, not all of these examples call for a complete system replacement. In many cases, reaching out to the pros to organise hot water servicing and repairs is more than enough to keep everything running smoothly.
What Influences the Cost of Replacing a Hot Water System?
Before comparing different systems, it’s important to understand what influences the final price.
Some of the biggest factors include:
- > System type (electric, gas, solar, heat pump)
- > Brand and energy star rating
- > System size and household demand
- > Installation complexity and accessibility
- > Plumbing or electrical requirements
- > Energy efficiency requirements and compliance
- > Government rebates and incentives
With these factors in mind, let’s break down each of the options available.
What Are the Best Options Available?
Electric Hot Water Systems
Electric hot water systems remain one of the most affordable and widely used options in Melbourne. They’re simple, reliable, and quick to replace in most homes.
According to HiPages’ 2026 pricing guide, electric hot water systems generally cost between $1,000 and $2,000 to install.
Leading brands include:
Rheem, Dux, Bosch
Pros:
- > Lowest upfront replacement cost
- > Simple installation process
- > Suitable for apartments and small homes
- > Wide range of sizes available
Cons:
- > Higher ongoing running costs
- > Less energy efficient than newer systems
- > Fully dependent on electricity prices
Electric systems remain a practical choice for homeowners looking for a straightforward, budget-friendly replacement.
Gas Hot Water Systems
Gas hot water systems are still common across Melbourne, particularly in homes already connected to natural gas. Instantaneous gas units are popular for their ability to deliver continuous hot water on demand.
HiPages estimates gas hot water system replacement costs typically range between $1,500 and $3,000 installed.
Leading brands include:
Rinnai, Rheem, Bosch
Pros:
- > Continuous hot water supply
- > Strong performance in cold weather
- > Lower running costs than standard electric systems
- > Well suited to larger households
Cons:
- > Requires an existing gas connection
- > Installation can be more complex
- > Less future-focused compared to electric alternatives
- > Ongoing gas usage costs
Gas systems remain a solid option where infrastructure already exists and demand is high.
Solar Hot Water Systems
Solar hot water systems are among the highest upfront investment options, but they can deliver significant long-term energy savings. This all depends on the complexity of your roof line and the booster backup option selected.
According to HiPages, solar hot water systems generally cost between $3,000 and $7,000 to install, depending on configuration and booster requirements.
Leading brands include:
Rheem, Dux, Stiebel Eltron
Pros:
- > Very low ongoing running costs
- > Environmentally friendly
- > Can significantly reduce energy bills
- > Eligible for government incentives in many cases
Cons:
- > Higher upfront investment
- > Requires suitable roof space and orientation
- > Performance depends on sunlight availability
- > Often requires a booster system
Solar is best suited to homeowners planning long-term occupancy and prioritising sustainability.
Heat Pump Hot Water Systems
Heat pump systems have grown rapidly in popularity across Victoria due to their energy efficiency and strong rebate eligibility.
HiPages reports heat pump hot water systems typically cost between $2,500 and $5,500 installed, depending on system size and installation conditions.
Leading brands include: Stiebel Eltron, Rheem, Dux
Pros:
- > Extremely energy efficient
- > Lower running costs compared to electric systems
- > Suitable for Melbourne’s climate
- > Eligible for various rebates and incentives
- > Environmentally friendly option
Cons:
- > Higher upfront cost than standard electric systems
- > May require more installation space
- > Some operational noise during heating cycles
Backed by generous state rebates and unmatched energy efficiency, heat pumps are now considered as the most balanced long-term solution for many Melbourne households looking to slash their running costs.
Which Hot Water System Offers the Best Value?
The best value option depends on your household size, budget, and long-term plans.
- > Electric: Best for lowest upfront cost
- > Gas: Best for high-demand homes with existing gas supply
- > Solar: Best for long-term energy savings and sustainability
- > Heat Pump: Best balance of efficiency, rebates, and running cost savings
A professional assessment from a licensed plumber like MCN Plumbing can help you choose the most cost-effective option for your home.
How Much Could You Save on Running Costs?
While installation costs are important, running costs often have a much greater impact over the life of the system.
A cheaper system may save you money upfront but can cost significantly more to operate over the next decade.
As a general guide:
- > Standard electric systems typically have the highest ongoing operating costs.
- > Gas systems often provide moderate running costs.
- > Heat pumps can use up to 60–75% less electricity than conventional electric storage systems.
- > Solar systems generally offer the lowest running costs when conditions are suitable.
When comparing replacement options, it’s worth considering total ownership costs rather than focusing solely on installation pricing.
Are Government Rebates Available in Victoria?
One of the biggest reasons heat pumps have surged in popularity is the availability of government incentives designed to encourage energy-efficient upgrades.
Depending on eligibility requirements and available programs, Victorian homeowners may be able to access rebates or discounts that reduce the upfront cost of installing an energy-efficient hot water system.
As rebate programs can change over time, it’s worth speaking with a qualified installer who can explain any current incentives available at the time of installation.
Hot Water Rebates
If you are upgrading to a heat pump or solar thermal system, you can massively offset your out-of-pocket installation expenses through government programs.
Solar Victoria Hot Water Rebate
As of mid-2026, Solar Victoria provides a direct rebate of up to $1,000 for eligible energy-efficient hot water products or up to $1,400 if you select a qualifying locally manufactured product.
Important Eligibility Update: To ensure cost-of-living relief is targeted to those who need it most, Solar Victoria introduced a new combined household income eligibility cap of $150,000 per year, down from the previous $210,000 cap.
The property must also be valued under $3 million, and you must not have previously received a hot water rebate under the program.
Victorian Energy Upgrades (VEU) & STCs
When upgrading from an inefficient electric tank or a gas unit to a high-efficiency heat pump, your installer can claim Victorian Energy Efficiency Certificates (VEECs) and federal Small-scale Technology Certificates (STCs).
These are typically applied as a direct, point-of-sale discount on your invoice, which can result in an additional $800 to $1,200+ discount off the total price. When properly stacked, these incentives can bring the net cost of a premium heat pump installation remarkably close to that of a standard, inefficient electric system.
Which Hot Water System Is Best for Your Home?
The ideal hot water system for your home depends on several factors, including your household size, energy goals, budget, and future plans.
Best for Lowest Upfront Cost
Electric Hot Water Systems
Ideal for homeowners looking for a simple and affordable replacement with minimal installation complexity and disruption.
Best for Larger Families
Gas Hot Water Systems
A great option for households with high hot water demand and existing gas infrastructure, a continuous-flow gas system remains a highly reliable option. Delivering an endless supply of hot water on demand without the need for expensive electrical switchboard upgrades.
Best for Sustainability
Solar Hot Water Systems
Perfect for homeowners looking to minimise energy consumption and reduce environmental impact.
Best Overall Value
Heat Pump Hot Water Systems
For many Melbourne households, heat pumps provide the best combination of energy efficiency, rebate eligibility, lower running costs, and long-term value.
Speak to MCN Plumbing Today
Replacing a hot water system is a significant household investment, but choosing the right system can deliver reliable hot water, lower energy bills, and improved efficiency for years to come.
If you’re unsure which system is right for your home, speak to MCN plumbing today. We can help you compare your options and identify the most cost-effective hot water system for your home.
Whether it’s a hot water service in Balaclava, Braeside or Doncaster, or you need a reliable plumber in Essendon, MCN Plumbing is here to help. Get in touch with us today on 0420 102 198 and we’ll help you find the right hot water system for your needs.
