Gas Hot Water Systems from $929
Our Top 3 Gas Hot Water Systems
Choose How You Want to Order
Not every hot water job is the same. Choose supply only if you already have an installer arranged, select supply and installation together where available, or compare your options if you are still deciding what best suits your home.
Supply Only
Best if you already have a licensed plumber, gas fitter or electrician arranged.
You receive the hot water system and the components listed with that product. Installation and site-specific work are not included unless shown or selected separately.
Valves, old unit removal, disposal, electrical work, pipework changes, gas work, drainage or compliance upgrades may be required depending on your installation.
Supplied & Installed
Best if you want the hot water system and installation organised together.
Select your preferred system, complete the installation questions on the product page and choose any applicable installation options before checkout.
Installation availability and final requirements depend on your location, access, existing services, selected system and site conditions.
Not Sure What You Need?
The right hot water system depends on household demand, energy source and your existing installation.
Compare electric, gas, heat pump and solar hot water systems using the ranges and selection tools throughout the site.
Consider household size, available space, energy source, recovery requirements, running costs and installation requirements before choosing.
SHOP GAS HOT WATER SYSTEMS BY SIZE OR FEATURE
Gas Hot Water Systems for Brisbane, Gold Coast & Major Australian Metros
Gas hot water systems use natural gas or LPG to heat household hot water and are available as both gas storage and instant gas continuous-flow systems. They are particularly relevant to homes that already have an appropriate gas supply and want to retain gas when replacing an existing hot water system.
Installed Today offers gas hot water systems for supply across supported mainland Australian metro areas, with supplied and installed options available on selected systems in eligible Brisbane and Gold Coast locations. Compare gas type, storage capacity or flow rate, household demand, dimensions, installation position and gas supply requirements before choosing a system.
What Matters When Comparing Gas Hot Water Systems?
What Is a Gas Hot Water System?
A gas hot water system burns natural gas or LPG to heat water for showers, baths, kitchens, laundries and other household hot water outlets.
Gas storage systems heat water and hold it inside an insulated tank ready for use. They can be a practical replacement when a property already has gas storage and the existing system has suited the household.
Gas continuous-flow systems heat water as it passes through the appliance rather than storing a full tank. These systems are commonly wall mounted and are selected according to expected hot water demand and required flow rate.
Natural Gas vs LPG Hot Water Systems
Natural Gas
Natural gas hot water systems are designed for properties with an appropriate mains natural gas supply.
If the existing hot water system already uses natural gas, replacing it with another suitable natural gas appliance is generally the first option to compare.
LPG
LPG hot water systems are designed for properties supplied by bottled or bulk LPG rather than mains natural gas.
LPG systems are commonly found on acreage properties, homes without mains gas and properties already using LPG for other appliances.
Check Before Ordering
Natural gas and LPG appliances are not automatically interchangeable. Order the correct gas version specified for the property and product.
If the gas type is unclear, have it confirmed by an appropriately licensed gas fitter before ordering.
Gas Storage vs Instant Gas Hot Water
| Feature | Gas Storage | Continuous Flow Gas |
|---|---|---|
| How it works | Heats and stores hot water inside a tank | Heats water as it passes through the appliance |
| How it is sized | Storage capacity plus recovery performance | Flow rate plus expected simultaneous demand |
| Physical format | Floor-mounted storage cylinder | Usually a compact wall-mounted appliance |
| Common replacement | Existing gas storage system | Existing gas continuous-flow system |
| Important checks | Capacity, gas type, recovery, dimensions and location | Flow rate, gas supply, water pressure, mounting and power |
Changing from storage to continuous flow can require more work than a like-for-like replacement because the gas demand, mounting position, water connections and electrical requirements may differ.
Instant Gas Hot Water Flow Rates
Continuous-flow gas hot water systems are commonly described by a litres-per-minute class. A higher rated flow provides greater hot water delivery capacity, but the actual output available depends on factors including incoming water temperature, selected outlet temperature, water pressure and gas supply.
| Flow Rate | Common Starting Point | Typical Reason to Compare It | Important Checks |
|---|---|---|---|
| 16L Class | Smaller homes and lower-demand applications | Compact continuous-flow option where simultaneous demand is relatively low | Bathrooms, shower demand, inlet temperature and gas supply |
| 20L Class | Small to medium households | Useful balance between physical size and increased flow | Simultaneous outlets, pressure and available gas supply |
| 26L Class | Family homes and stronger household demand | Greater continuous-flow capacity where multiple outlets may be used | Gas pipe capacity, household demand and temperature rise |
| Higher Flow | Larger or high-demand applications | Additional flow capacity where the property and gas supply support it | Appliance specifications and licensed gas assessment |
Flow-rate classes are a comparison guide only. Actual hot water delivery varies with operating conditions and individual product specifications.
Choosing a Gas Storage Hot Water System
Gas storage systems should be assessed by both tank capacity and recovery performance. A gas burner can reheat stored water as it is used, so tank litres alone do not provide the complete picture of household suitability.
Tank Capacity
Consider how much stored water is available during peak household use and whether the existing tank has historically supplied enough hot water.
Recovery
Recovery performance affects how quickly the system can replace hot water after stored water has been used.
Existing Installation
Like-for-like storage replacement can be simpler when dimensions, gas type, connection positions and installation location are similar.
Why Gas Supply Matters for Hot Water
A gas hot water appliance needs an adequate gas supply for its rated input. This is particularly important when changing appliance type or moving to a higher-capacity continuous-flow system.
Existing gas pipework that was adequate for an older or lower-input appliance may not automatically be suitable for a different gas hot water system.
Gas pipe sizing, available pressure, regulators and total connected gas load should be assessed by an appropriately licensed gas fitter. Additional gas work may be required before the selected system can be installed.
Gas Hot Water Location, Clearances & Ventilation
Many residential gas hot water systems in the current range are designed for external installation. The correct installation position depends on the appliance type, manufacturer instructions and applicable gas installation requirements.
Appliance clearances need to be considered around windows, doors, openings, boundaries, building features and other services. Continuous-flow systems also need appropriate mounting, water connections and, for many models, an electrical supply for ignition and controls.
An appliance designed for external installation should not be treated as an indoor appliance. Internal gas installations require a system specifically approved and installed for that application.
Gas Hot Water Systems Brisbane
Brisbane is a primary gas hot water installation market for Installed Today. Selected gas systems can be ordered with professional installation in eligible Brisbane, Logan, Ipswich, Moreton Bay and Redlands service areas, subject to the selected product, postcode, gas type and installation requirements.
Common Brisbane gas hot water jobs include natural gas storage replacements, LPG replacements, continuous-flow replacements and upgrades from older gas storage systems to suitable wall-mounted continuous-flow appliances.
Installation requirements can include gas pipework, plumbing, valves, electrical supply, mounting, drainage, disposal and compliance work depending on the existing system and property.
Gas Hot Water Systems Gold Coast
Installed Today also offers selected gas hot water systems supplied and installed across eligible Gold Coast service areas.
Gas storage and continuous-flow systems can both provide practical replacement options where a suitable natural gas or LPG supply already exists at the property.
Before confirming installation, the selected appliance needs to suit the gas type, household demand, available gas supply, installation position, water services and applicable compliance requirements.
Buy Gas Hot Water Systems Across Major Australian Metro Areas
Customers who already have an appropriately licensed installer arranged can order gas hot water systems for supply across supported mainland Australian metro areas.
Our main gas hot water markets include Brisbane, Gold Coast, Sunshine Coast, Sydney, Melbourne, Perth and Adelaide, together with major regional and metropolitan centres including Townsville, Cairns, Toowoomba, Newcastle, Central Coast, Wollongong and Geelong.
Installation availability is separate from product supply. Brisbane and Gold Coast are the primary installed gas hot water markets, while customers in other supported areas can purchase supply only where delivery is available and arrange their own appropriately licensed gas fitter or plumber.
Replacing an Existing Gas Hot Water System
If the existing gas hot water system has provided enough hot water, replacing it with the same gas type and a similar appliance style is generally the first option to compare.
- Natural gas or LPG
- Storage or continuous flow
- Existing capacity or flow rate
- Household and bathroom demand
- Available gas supply
- Gas pipework suitability
- Appliance dimensions and access
- Water connection positions
- Installation clearances
- Electrical supply where required
- Drainage and valve requirements
- Current compliance requirements
Even a like-for-like replacement needs to comply with current requirements. Changes to appliance type, flow rate, gas demand or installation position can increase the amount of plumbing, gas or electrical work required.
Changing from Gas Storage to Instant Gas Hot Water
Changing from gas storage to instant gas continuous-flow hot water can free up ground space and remove the need to maintain a large stored volume of hot water.
However, it is not always a simple product swap. Continuous-flow systems can have different gas input, water connection, wall-mounting and electrical requirements from the storage system they replace.
The available gas supply is particularly important. A higher-output continuous-flow appliance may require gas pipework changes even when the property already has gas connected.
Gas Hot Water Brands
The current Installed Today gas hot water collection includes systems from established brands including Rinnai, Rheem and Bosch, across natural gas, LPG, storage and continuous-flow options.
Brand should be considered alongside the product itself. Compare gas type, flow rate or storage capacity, energy rating, dimensions, warranty, connection positions and suitability for the existing installation.
For replacement work, a system that closely suits the existing gas supply, household demand and installation layout can be more practical than choosing solely by brand or advertised price.
Gas vs Electric and Heat Pump Hot Water
Gas Hot Water
Storage and continuous-flow options for properties with an appropriate natural gas or LPG supply. Particularly relevant for replacing an existing gas appliance.
Electric Storage
Straightforward stored hot water available in a broad range of tank capacities and often practical where the property is already configured for electric hot water.
Heat Pump
Uses electricity and heat from surrounding air to heat stored water and is commonly considered when reducing hot water electricity consumption is a priority.
Choose How You Want to Order
Supply Only
Choose supply only if you already have an appropriately licensed gas fitter or plumber arranged and simply need the gas hot water system supplied.
Installation, gas work, valves, disposal, electrical work, pipework, mounting and compliance work are not included unless specifically shown.
Brisbane Installation
Selected gas hot water systems are available with installation in eligible Brisbane metro service areas.
Availability depends on the product, postcode, gas type, existing system and site conditions.
Gold Coast Installation
Supplied and installed gas hot water options are also available for selected products in eligible Gold Coast areas.
Product and installation options are confirmed during the ordering process.
Compare the Complete Gas Hot Water System
A suitable gas hot water system needs to match the fuel supply, household demand and installation conditions — not simply the advertised tank capacity or flow rate.
Compare natural gas or LPG, storage or continuous flow, household demand, gas supply, dimensions, location, warranty, serviceability and installation requirements before ordering.
Product specifications, pricing and availability can change. Check the individual product information and selected installation option before placing your order.
Gas Hot Water System FAQs
Common questions about choosing, ordering and installing a gas hot water system for natural gas or LPG homes.
Can I buy a gas hot water system supply only?
Yes. Choose supply only if you already have a licensed plumber or gas fitter arranged. Supply-only pricing is for the gas hot water system only and does not include installation, valves, old unit removal, disposal, gas work, pipework changes or compliance upgrades unless selected separately.
Can I order a gas hot water system supplied and installed?
Yes. Supplied and installed options are available for selected gas hot water systems in eligible Brisbane and Gold Coast service areas. Availability depends on your location, access, gas type, existing setup, product type and site requirements.
What is the difference between natural gas and LPG hot water systems?
Natural gas and LPG systems are not the same. You need to choose the correct gas type for your property. A natural gas model should not be used on LPG unless the product is specifically designed or correctly converted by a licensed gas fitter.
What is the difference between gas continuous flow and gas storage hot water?
Gas continuous flow systems heat water as it passes through the unit, while gas storage systems heat and store water in a tank. Continuous flow units are compact and heat on demand, while gas storage systems may suit homes replacing an existing storage unit.
Are external gas hot water systems suitable indoors?
External gas hot water systems are designed for outdoor installation only. They should not be installed indoors unless the manufacturer specifically states the model is suitable for internal or flued installation.
What size gas hot water system do I need?
The right size depends on household size, number of bathrooms, shower habits, gas supply, flow rate requirements and whether you are choosing continuous flow or storage. Larger homes may need a higher capacity or higher flow rate system.
What does flow rate mean for gas continuous flow hot water?
Flow rate is the amount of hot water the system can deliver per minute. A higher flow rate can support more demand, but the right option depends on your household use, inlet water temperature, selected outlet temperature and gas supply.
Can I replace my old gas hot water system with the same type?
In many cases, replacing like-for-like can be a straightforward option, but the new system still needs to suit your gas type, household demand, available space, flue or ventilation requirements, pipework and current compliance requirements.
Does installation include gas pipework or compliance upgrades?
Gas pipework changes, valve upgrades, regulator work, flue changes and compliance upgrades are not automatically included unless shown in the selected installation option or chosen as an add-on. These requirements depend on the property and existing setup.
Does installation include old system removal and disposal?
Old system removal and disposal are not automatically included unless shown in the selected installation option or chosen as an add-on. Access, system size, location and site conditions can affect what is required.
Do you install gas hot water systems in Brisbane and the Gold Coast?
Supplied and installed options are available in eligible Brisbane and Gold Coast service areas. Availability depends on the selected product, your address, gas type, access, existing system and installation requirements.