Gas Hot Water Systems
Shop gas hot water systems online with Installed Today for supply-only ordering across major Australian metro areas, with supplied and installed options available on selected products in eligible Brisbane and Gold Coast service areas.
Gas hot water systems are a popular choice for homes that already have natural gas or LPG available. They are commonly chosen for fast recovery, reliable everyday hot water, compact outdoor installation options and practical replacement of existing gas storage or continuous flow systems.
This collection is built for customers comparing natural gas and LPG hot water systems, including gas storage hot water systems and instant gas hot water systems. Whether you are replacing an old gas unit, upgrading from storage to continuous flow, choosing a system for a rental property, or comparing gas hot water options before ordering, Installed Today makes it easier to compare trusted brands, sizes, flow rates and installation choices in one place.
Choose supply only if you already have your own licensed gas fitter or plumber arranged. Choose supplied and installed where available if you want the gas hot water system and installation organised together in an eligible Brisbane or Gold Coast service area.
Supply Only Gas Hot Water Systems Across Australian Metro Areas
Supply only is ideal if you already have a licensed gas fitter or plumber ready to install your new gas hot water system. This option suits homeowners managing their own trade, builders ordering for a project, property managers coordinating with preferred contractors, and trade customers who only need the unit supplied.
The product price is for the gas hot water system only. Installation, valves, old unit removal, disposal, gas work, electrical work, pipework changes, tempering valves, drainage work, access upgrades, compliance upgrades and gas compliance work are not included unless selected separately.
Before ordering supply only, check that the gas hot water system suits the property, gas type, available gas supply, household demand, installation location, water pressure, access path and compliance requirements. This is especially important when changing from storage to continuous flow, changing from electric to gas, replacing an older gas unit, or choosing between natural gas and LPG.
Supplied and Installed Gas Hot Water Systems in Brisbane and Gold Coast
Supplied and installed options are available on selected gas hot water systems in eligible Brisbane and Gold Coast service areas. This option is designed for customers who want the product and installation organised together instead of buying the unit separately.
Supplied and installed can be useful when an existing gas hot water system has failed, when a rental property needs a practical replacement, or when a household wants to upgrade to a modern gas continuous flow system.
Availability depends on your address, existing system, gas type, installation location, site access, plumbing setup, gas supply, electrical requirements, drainage and current compliance needs. Some jobs may need additional valves, disposal, gas pipe upgrades, electrical work, pipework changes, drainage changes or compliance upgrades depending on the property.
What Is a Gas Hot Water System?
A gas hot water system uses natural gas or LPG to heat water for showers, taps, baths, kitchens, laundries and general household use. Gas hot water systems are generally available as gas storage systems or gas continuous flow systems.
Gas storage hot water systems heat and store water inside a tank, ready for use when needed. They are often chosen when a property already has a gas storage unit and the customer wants a practical like-for-like replacement.
Instant gas hot water systems, also called gas continuous flow hot water systems, heat water as it passes through the unit. They are usually wall-mounted external units and are commonly chosen where customers want a compact system that does not store a full tank of hot water.
Gas hot water can be a strong option where the property already has the correct gas supply and the system is properly sized for household demand.
Natural Gas vs LPG Hot Water Systems
Gas hot water systems must be matched to the correct gas type. Natural gas and LPG are not interchangeable unless the product is specifically converted or configured by the manufacturer and a licensed gas fitter.
Natural gas hot water systems are designed for properties connected to a natural gas supply. They are common in many metro areas where mains gas is available.
LPG hot water systems are designed for properties using bottled LPG. They are often used in homes without natural gas access, rural properties, acreage homes, granny flats, secondary dwellings and selected outdoor installations where LPG is already available.
Before ordering, check whether your current system is natural gas or LPG. Choosing the wrong gas type can delay installation and may require product exchange or additional work.
Gas Storage vs Instant Gas Hot Water
Gas storage hot water systems hold heated water inside a tank. They can be a practical option when replacing an existing gas storage unit, especially where the home is already set up for that style of system.
Instant gas hot water systems heat water only when a tap or shower is turned on. They are usually mounted externally on a wall and are available in different flow rates to suit different household sizes and usage patterns.
Gas storage may be suitable where the customer wants a familiar replacement and the existing storage setup has worked well. Instant gas may be suitable where the customer wants a compact external system, strong continuous hot water performance and a model matched to the number of bathrooms and outlets.
The right choice depends on existing services, gas supply, household demand, available space, budget, installation location and whether extra gas or plumbing work is needed.
Instant Gas Hot Water Flow Rate Guide
Instant gas hot water systems are usually compared by flow rate rather than tank capacity. Common residential sizes include 16L, 20L and 26L models, depending on the brand and product range.
A 16L instant gas hot water system may suit smaller homes, units, townhouses, granny flats or properties with lower hot water demand.
A 20L instant gas hot water system may suit small to medium households wanting a practical balance of flow rate, size and price.
A 26L instant gas hot water system is often chosen for family homes, larger households, homes with multiple bathrooms or properties where stronger hot water flow is required.
Flow rate selection depends on the number of bathrooms, number of outlets likely to run at once, climate, incoming water temperature, gas supply, water pressure and household expectations.
Gas Storage Hot Water Size Guide
Gas storage hot water systems are compared by tank capacity and recovery performance. The right size depends on the number of people in the home, number of bathrooms, shower habits, bath use, laundry demand and how heavily hot water is used during peak periods.
Smaller gas storage systems may suit lower-demand households, units, couples or small homes.
Medium gas storage systems may suit family homes and everyday replacement jobs where the existing system has performed well.
Larger gas storage systems may suit higher-use households, rental properties, homes with multiple occupants and properties where stored hot water demand is above average.
When replacing gas storage, check the current tank size, gas type, location, connection positions, available space, ventilation, flue requirements where relevant and whether the new system suits the site.
Outdoor Gas Hot Water Installation
Most gas hot water systems sold for residential replacement are external outdoor models unless the product is specifically designed and approved as an internal or flued indoor model.
External gas hot water systems are commonly installed on an outside wall, beside the home, near an existing service area, in a side passage, near a laundry wall or in another compliant outdoor location.
Before ordering, check the system’s location, clearances, gas pipework, water connections, drainage, power requirements for continuous flow units, access, ventilation and compliance requirements.
Gas systems should not be installed in unsuitable enclosed or internal spaces unless the model and installation are specifically designed for that application and completed by the appropriate licensed trade.
Replacing an Existing Gas Hot Water System
If your existing gas hot water system has worked well, replacing it with a similar gas type and product style can often be the most practical option. This may mean choosing another natural gas storage unit, another LPG storage unit, or another instant gas system with a similar flow rate.
Before choosing a replacement, check the old system’s gas type, model style, capacity or flow rate, installation location, connection points, electrical requirements, valve condition, drainage, gas pipe sizing and access.
A replacement is also a good time to consider whether the current system still suits the property. A growing family may need a higher flow rate or larger capacity. A smaller household may not need the same system size. A rental property may prioritise practical replacement and brand reliability. A renovation may change where the system can be installed.
Changing from Electric to Gas Hot Water
Changing from electric to gas hot water may be possible where the property has a suitable natural gas or LPG supply. However, it is not usually a simple product swap.
The job may require gas pipework, plumbing changes, electrical work for ignition or controls, removal of the old electric unit, new valves, drainage changes, wall mounting, compliance upgrades and gas certification.
Before changing from electric to gas, consider the full job cost, installation location, gas availability, household demand and whether gas continuous flow or gas storage is the better option for the property.
The product price alone does not include extra gas work, electrical work, pipework changes or compliance upgrades unless selected separately.
Gas Hot Water Brands Available
Installed Today stocks selected gas hot water systems from trusted brands, depending on product availability. Across the broader gas hot water range, this may include brands such as Rinnai, Rheem, Vulcan, Dux, Bosch and Aquamax.
When comparing gas hot water brands, look beyond the brand name. Check the gas type, flow rate or storage capacity, warranty, dimensions, connection positions, energy rating, household suitability, outdoor installation requirements and whether the model is a practical replacement for your existing system.
Some customers want a budget-friendly replacement. Others want a premium continuous flow model, a built-tough storage unit, a known brand, a compact wall-mounted system, or a product that closely matches the existing unit. The best choice depends on the property, budget and reason for replacement.
Gas Hot Water System Buying Guide
Should I choose natural gas or LPG hot water?
Choose natural gas if your property is connected to natural gas and the existing hot water setup is designed for natural gas. Choose LPG if your property uses bottled LPG and the selected model is specifically designed for LPG.
Natural gas and LPG models are different, so the correct version must be ordered. If you are unsure, check the label on the existing unit or confirm with your licensed gas fitter before ordering.
Is instant gas better than gas storage hot water?
Instant gas hot water can be a strong option where the property has suitable gas supply, water pressure and external installation space. It heats water as needed and is usually wall-mounted, which can save ground space.
Gas storage hot water may be better when replacing an existing storage unit and the customer wants a familiar style of system. It stores heated water in a tank and can be a practical replacement where the current setup has worked well.
The better option depends on household demand, gas supply, installation location, upfront budget and whether extra gas or plumbing work is needed.
What size instant gas hot water system do I need?
The right instant gas size depends on the number of bathrooms, number of outlets used at once, incoming water temperature, gas supply, water pressure and household expectations.
A smaller household may suit a 16L model. A medium home may compare 20L models. A larger family home or property with multiple bathrooms may need a 26L model or larger, depending on the product range and site conditions.
Can I replace my old gas hot water system with the same type?
Replacing like-for-like can be practical if the old gas hot water system suited the property and supplied enough hot water. This may help keep the replacement closer to the existing pipework, gas supply and installation location.
However, the new system still needs to meet current requirements. Gas type, clearances, valves, drainage, pipe sizing, electrical supply and compliance conditions should all be checked before installation.
Can I change from gas storage to instant gas hot water?
Changing from gas storage to instant gas may be possible, but it is not always a simple swap. Instant gas systems have different flow rate requirements, mounting requirements, gas supply needs, water connection positions and sometimes electrical requirements.
The job may involve gas pipe upgrades, plumbing changes, wall mounting, electrical work, drainage changes, valve upgrades or compliance work. These extras are not included in the product price unless selected separately.
Are gas hot water systems suitable for rental properties?
Gas hot water systems can suit many rental properties, especially where the home already has a gas hot water setup and the existing system type has worked well.
For rentals, the best gas hot water system is usually practical, reliable and correctly matched to tenant demand. A smaller rental may suit a lower flow rate or storage capacity, while a family rental may need a stronger continuous flow model or larger gas storage system.
What should I check before buying a gas hot water system online?
Before buying a gas hot water system online, check the gas type, product style, flow rate or storage capacity, installation location, connection positions, clearances, water pressure, gas supply, access path, drainage, electrical requirements and whether the property may need extra valves, gas work, pipework changes or compliance upgrades.
For supply only, your licensed gas fitter or plumber should confirm suitability before installation. For supplied and installed options in Brisbane and Gold Coast, the product page questions help identify common installation requirements before checkout.
Can gas hot water systems be installed indoors?
Most residential gas hot water systems sold for standard replacement are external outdoor models unless the product is specifically designed and approved as an internal or flued indoor model.
Do not assume an external gas hot water system can be installed indoors. Indoor gas installations require the correct appliance type, flueing, ventilation and compliance setup. The product specifications and licensed installer should confirm suitability before ordering.
Why Buy Gas Hot Water Systems from Installed Today?
Installed Today makes it easier to compare gas hot water systems online by bringing natural gas, LPG, gas storage and instant gas options into one collection.
You can compare trusted brands, gas types, storage capacities, flow rates, installation considerations and ordering options without visiting a showroom or waiting for multiple quotes just to understand your choices.
Customers choose Installed Today for supply-only ordering across major Australian metro areas and supplied and installed options on selected gas hot water systems in eligible Brisbane and Gold Coast service areas.
Whether you need a natural gas replacement, an LPG hot water system, a gas continuous flow upgrade, a storage gas replacement, or a supply-only product for your own licensed installer, this collection helps you choose a gas hot water system that suits the property, budget and household demand.
