The best hot water system for your home depends on household size, daily water use, available energy sources, installation space, and long-term running costs. For many Australian households, a heat pump is a strong all-round option because it uses considerably less electricity than conventional electric storage, while solar, gas, and electric systems can still suit particular homes and budgets.
Key Takeaways
- Heat pumps suit many households seeking lower energy use.
- Electric storage has a lower upfront cost but can cost more to run.
- Continuous-flow systems heat water only when required.
- Solar hot water can reduce purchased energy use but costs more upfront.
- Household size and usage should guide system sizing.
What Type of Hot Water System Is Best for Your Home?
A heat pump is the best all-round hot water system for many Australian homes, while the right choice ultimately depends on household size, energy supply, available space, and upfront versus long-term costs.
According to the Australian Government’s Energy Rating resource on water heating, water heating accounts for around one quarter of all energy use in Australian households, and choosing the right system can result in significant ongoing savings.
No single system type suits every household. The sections below cover each option, what it costs to run, and what it suits best.
Gas Storage Hot Water Systems
Gas storage systems heat water in an insulated tank using a gas burner and keep it ready at a preset temperature at all times. They are the most common system type on the Mornington Peninsula, particularly in homes built before 2010.
How They Work?
Gas storage hot water systems work by storing water in a tank and using a gas burner to reheat it whenever the temperature falls below the thermostat setting.
The core hot water cylinder plumbing connects cold water supply at the base, hot water outlet at the top, a pressure relief valve, and a gas connection to the burner assembly. All this work requires a licensed plumber.
Who It Suits?
Gas storage suits households with a reticulated natural gas connection and consistent daily hot water demand. Running costs are moderate, lower than standard electric storage but higher than heat pump alternatives.
The important Victorian context: from 1 March 2027, existing homes must replace gas hot water systems with an efficient electric alternative when those systems reach end of life. Any gas storage system on the Peninsula that is due for replacement now or soon is worth replacing with a heat pump rather than a like-for-like gas unit.
Electric Storage Hot Water Systems
Electric storage systems work the same way as gas storage but use an electric resistance element inside the tank to heat the water.
They are typically the cheapest system to purchase and install. Running costs, however, are the highest of any storage type when on standard grid tariffs, because electric resistance heating is inherently less efficient than gas combustion or heat pump technology.
The exception is off-peak tariff systems. Where a property has an off-peak electricity tariff available, an electric storage system can be programmed to heat water overnight at a lower tariff rate, which reduces running costs significantly compared to a standard tariff.
For most Peninsula households without an existing off-peak arrangement and without a solar panel system, electric storage is not the recommended long-term option given the running cost disadvantage.
Heat Pump Hot Water Systems
Heat pump hot water systems extract heat from ambient air and use it to heat water inside a storage tank, using electricity only to run the compressor rather than to generate heat directly.
According to Solar Victoria’s guidance on heat pump hot water systems, heat pumps use approximately 60 to 75 percent less electricity than a conventional electric hot water system. Victorian households replacing an inefficient gas or electric system with a heat pump are eligible for a rebate of up to $1,000 through the Solar Homes Program, or up to $1,400 for a locally made product.
Key advantages of heat pump systems include:
- Significantly lower running costs than gas storage or standard electric storage.
- Eligible for Victorian Government rebate up to $1,400, reducing the upfront cost gap.
- Suitable for properties without a gas connection or where gas is being phased out.
- Works best in areas with mild to moderate ambient temperatures, which describes most of the Mornington Peninsula well.
The system requires adequate outdoor air circulation around the compressor unit and some clearance from living areas, as the unit produces a low level of noise during operation.
Solar Hot Water Systems
Solar hot water systems use roof-mounted collectors to absorb heat from sunlight and transfer it to water in a storage tank. A booster element, either electric or gas, supplements the solar heating on overcast days or during periods of high demand.
Solar hot water is the system with the lowest operating cost over its lifetime when solar radiation is adequate and the system is correctly sized. It requires north-facing roof space with minimal shading, which suits a large proportion of Peninsula homes but not all.
The upfront installation cost is higher than gas or electric storage, and the system adds mechanical complexity through the solar collectors, circulation pump, and controller. A well-maintained solar system lasts 20 years or more, making the long-term economics strong for the right property.
Continuous Flow (Instantaneous) Hot Water Systems
Continuous flow systems heat water on demand rather than storing it in a tank. A gas or electric burner activates when hot water is drawn and heats the water as it passes through the unit.
Gas continuous flow is common in Melbourne and on the Peninsula and offers effectively unlimited hot water supply. There is no standby heat loss because no tank is maintained at temperature around the clock.
Electric continuous flow is less common in Victoria for whole-home applications due to the high power draw required, but smaller point-of-use electric units are used in additions or extensions where extending the existing hot water pipe run would be impractical.
For homes with long pipe runs from the hot water system to bathrooms or bathrooms at the far end of the property, a recirculating hot water loop can be added to continuous flow or storage systems, keeping hot water immediately available at every fixture without running water to waste.
Hot Water Tank Maintenance: What Each System Requires?
Hot water system maintenance typically includes relief-valve testing and tank servicing for storage systems, burner and flue checks for gas systems, and filter, coil, and refrigerant checks for heat pumps.
Storage systems of all types, whether gas, electric, or heat pump, need the pressure and temperature relief valve tested annually, the anode rod inspected every three to five years, and the tank flushed periodically to remove sediment.
Gas systems need the burner, thermostat, and flue checked by a licensed plumber on a regular schedule. Heat pump systems need the air filter and coil kept clear of debris and the refrigerant loop checked for correct pressure.
The full hot water tank maintenance schedule for each system type, including what a licensed plumber checks and how often, gives Peninsula homeowners a practical reference for keeping their system in reliable condition regardless of which type they have.
How to Choose the Right System for Your Mornington Peninsula Home?
Choose the right hot water system for your Mornington Peninsula home by checking your available energy source, household hot water demand, installation space, Victorian electrification requirements, and the total installation and running costs.
- Confirm the energy source. Gas or electric? Natural gas, LPG, or electric-only? This determines which systems are physically available to the property before any cost comparison is made.
- Assess household demand. One or two people have very different hot water needs to a household of five or more. Tank size and system capacity need to match the realistic peak demand of the household.
- Check available space. A heat pump unit needs clearance for airflow. Solar collectors need north-facing roof space with minimal shading. These constraints eliminate options before any cost analysis is needed.
- Consider the Victorian Government transition. Gas hot water systems in Victoria will need to be replaced with electric alternatives as they reach end of life from 2027. Replacing a failing gas system now with a heat pump rather than another gas unit avoids a second replacement within a few years.
- Get a written quote from a licensed plumber. The final system choice should be based on a site inspection, not on general estimates, because connection type, pipe routing, and access conditions all affect the total installation cost.
Need a Hot Water System Installed on the Mornington Peninsula?
DCG Plumbing provides hot water installation across the Mornington Peninsula, covering gas storage, electric, heat pump, solar, and continuous flow systems. We assess the property, confirm the right system for the household, and handle the full installation to compliance standard.
We are a licensed plumbing contractor (BPC 108845) with direct experience across the range of hot water connection types found on Peninsula properties, from reticulated gas through to LPG and electric-only supplies.
Call 0401 266 656 or contact us through the website to arrange an inspection and quote.
Final Thoughts on Choosing a Hot Water System
The type of hot water system that suits a home comes down to energy source, household demand, available space, and where the priority sits between upfront installation cost and long-term running savings.
Heat pumps are the fastest-growing system type in Victoria for good reason: the running cost advantage is substantial, the Victorian Government rebate reduces the upfront gap, and the phase-out of gas systems from 2027 makes them the practical long-term choice for most electric-capable properties.
Getting the right hot water system installation starts with a site inspection by a licensed plumber who can confirm the connection type, assess demand, and quote accurately before any system is committed to.
