Instant Gas Hot Water Systems
Shop instant 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.
Instant gas hot water systems, also known as gas continuous flow hot water systems, heat water as it passes through the unit instead of storing hot water in a tank. They are commonly chosen for homes wanting a compact external hot water system, reliable everyday performance, strong recovery and a practical replacement for an existing gas continuous flow unit.
This collection is built for customers comparing natural gas and LPG instant gas hot water systems in common residential flow rates such as 16L, 20L and 26L. Whether you are replacing an old continuous flow unit, upgrading from gas storage, choosing a compact external system for a family home, or comparing trusted brands before ordering, Installed Today makes it easier to compare product options 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 instant gas hot water system and installation organised together in an eligible Brisbane or Gold Coast service area.
Supply Only Instant 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 instant gas hot water system. This option suits homeowners managing their own trade, builders ordering for a project, property managers arranging a replacement, and trade customers who only need the unit supplied.
The product price is for the instant gas hot water system only. Installation, valves, old unit removal, disposal, gas work, electrical work, power point changes, pipework changes, tempering valves, drainage work, access upgrades, wall mounting changes and compliance upgrades are not included unless selected separately.
Before ordering supply only, check that the instant gas system suits the property, gas type, available gas supply, water pressure, flow rate requirements, household demand, installation location, access path and compliance requirements. This is especially important when changing gas type, upgrading to a larger flow rate, replacing an older unit, or changing from storage gas to continuous flow.
Supplied and Installed Instant Gas Hot Water Systems in Brisbane and Gold Coast
Supplied and installed options are available on selected instant 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 instant gas system has failed, when a household needs a compact external replacement, or when a property owner wants to upgrade from gas storage to a 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, wall mounting changes, drainage changes or compliance upgrades depending on the property.
What Is an Instant Gas Hot Water System?
An instant gas hot water system heats water only when a hot tap or shower is turned on. Cold water passes through the unit, the gas burner activates, and the water is heated as it flows through the heat exchanger.
Because instant gas systems do not store a full tank of heated water, they are usually smaller than storage hot water systems and are commonly mounted on an external wall. This can make them a practical choice for homes with limited ground space or customers wanting a compact hot water replacement.
Instant gas systems are usually compared by flow rate, not tank size. Common residential options include 16L, 20L and 26L models, with the right choice depending on the number of bathrooms, number of outlets used at once, gas supply, incoming water temperature and household expectations.
Natural Gas vs LPG Instant Gas Hot Water
Instant gas hot water systems must be matched to the correct gas type. Natural gas and LPG are different, and the wrong model should not be ordered for the property.
Natural gas instant 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 instant hot water systems are designed for properties using bottled LPG. They can suit homes without natural gas access, acreage properties, rural 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.
Instant Gas Hot Water Flow Rate Guide
Instant gas hot water systems are usually described by litres per minute. This refers to the flow rate the unit is designed to deliver under suitable conditions.
A 16L instant gas hot water system may suit smaller homes, units, townhouses, granny flats, couples 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, price and everyday performance.
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 more than household size. The right model also depends on gas pipe sizing, water pressure, incoming water temperature, number of bathrooms, number of outlets used at the same time and whether the home has higher peak-time demand.
16L Instant Gas Hot Water Systems
A 16L instant gas hot water system is generally suited to smaller homes and lower-demand properties. It can be a practical option for units, townhouses, granny flats, couples, single occupants and homes where only one bathroom is used regularly.
A 16L system may also suit like-for-like replacement where the existing 16L unit has been performing well and the household does not need a higher flow rate.
For larger families, homes with multiple bathrooms, or properties where two showers may run at the same time, a 20L or 26L system may be worth comparing.
20L Instant Gas Hot Water Systems
A 20L instant gas hot water system can be a good middle option for small to medium households. It provides more flow capacity than a 16L system while staying below the larger 26L models commonly used for bigger family homes.
A 20L unit may suit homes with moderate hot water use, one to two bathrooms, smaller families, townhouses, rentals and properties where the existing 20L system has worked well.
The right result still depends on the site. Gas supply, water pressure, pipe sizing, number of outlets and installation location all matter when comparing 20L instant gas hot water systems.
26L Instant Gas Hot Water Systems
A 26L instant gas hot water system is commonly chosen for family homes, larger households and properties with higher hot water demand. It can suit homes where multiple people use hot water during morning or evening peak times, or where a stronger flow rate is preferred.
A 26L system may be a practical choice for homes with multiple bathrooms, larger families, rental properties with several occupants and customers upgrading from a smaller continuous flow unit that has struggled to keep up.
A larger flow rate is not automatically better for every property. The gas supply, water pressure, pipe sizing and installation conditions must support the selected system.
Instant Gas vs Gas Storage Hot Water
Instant gas and gas storage hot water systems work differently.
Instant gas systems heat water as needed and are usually wall-mounted external units. They do not store a full tank of hot water, which can make them a compact option for homes with suitable gas supply and outdoor wall space.
Gas storage systems heat and store water inside a tank. They can be a practical choice when replacing an existing gas storage unit and the customer wants a familiar replacement style.
Instant gas may be better where the customer wants a compact external unit and the property has suitable gas supply. Gas storage may be better where the current storage setup has worked well and the customer wants a simpler like-for-like replacement.
The best option depends on household demand, gas type, installation location, budget, pipe sizing, water pressure and whether extra gas or plumbing work is required.
Instant Gas vs Electric Hot Water
Instant gas hot water systems use natural gas or LPG to heat water as it flows through the unit. Electric hot water systems usually heat and store water inside a tank, although instant electric options are also available for selected applications.
Instant gas can suit homes that already have a suitable gas supply and want a compact external system. Electric storage may suit homes already set up for electric hot water and customers wanting a straightforward like-for-like replacement.
Changing from electric to instant gas is not usually a simple product swap. The property may need gas pipework, electrical work, wall mounting, plumbing changes, valve upgrades, drainage changes and compliance work. These extras are not included in the product price unless selected separately.
Outdoor Installation for Instant Gas Hot Water
Most residential instant gas hot water systems are external outdoor units unless the model is specifically designed and approved as an internal or flued indoor appliance.
External instant gas systems are commonly installed on an outside wall, near an existing hot water location, beside a laundry wall, in a side passage or near an external service area. The location needs to meet clearance, ventilation, drainage, gas, water and electrical requirements.
Do not assume an external instant gas 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.
Replacing an Existing Instant Gas Hot Water System
If your existing instant gas hot water system has worked well, replacing it with another unit of the same gas type and similar flow rate can often be the most practical option.
Before choosing a replacement, check the old system’s gas type, flow rate, brand, model, installation location, water connection positions, gas connection position, electrical requirements, valve condition, drainage, access and wall mounting setup.
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. A smaller household may not need the same size. A rental property may prioritise a practical and reliable replacement. A renovation may change where the system can be installed.
Changing from Gas Storage to Instant Gas
Changing from gas storage to instant gas may be possible, but it is not always a simple swap. A gas storage tank and an instant gas system have different installation requirements, connection positions and gas supply demands.
The job may require gas pipe upgrades, wall mounting, plumbing changes, electrical work, valve upgrades, drainage changes, removal of the old tank and compliance work.
Before changing system type, compare the full job requirements, not just the product price. The product price alone does not include extra gas work, electrical work, pipework changes, disposal or compliance upgrades unless selected separately.
Instant Gas Hot Water Brands Available
Installed Today stocks selected instant gas hot water systems from trusted brands, depending on product availability. Across the broader instant gas hot water range, this may include brands such as Rinnai, Rheem, Bosch and Dux.
When comparing instant gas hot water brands, look beyond the brand name. Check the gas type, flow rate, warranty, dimensions, connection positions, temperature control options, outdoor installation requirements, household suitability and whether the model is a practical replacement for your existing system.
Some customers want a premium continuous flow system. Others want a built-tough replacement, a strong-value option, a known brand, a compact external unit, or a product that closely matches the old system. The best choice depends on the property, budget and reason for replacement.
Instant Gas Hot Water System Buying Guide
What size instant gas hot water system do I need?
The right instant gas hot water size depends on the number of bathrooms, number of people in the home, number of outlets used at once, incoming water temperature, gas supply, water pressure and household expectations.
A 16L system may suit smaller homes and lower-demand properties. A 20L system may suit small to medium households. A 26L system is commonly chosen for family homes and higher-demand properties.
Is a 26L instant gas hot water system better than a 20L system?
A 26L instant gas system provides a higher flow rate than a 20L model and may suit larger homes, multiple bathrooms or households with heavier hot water demand.
A 20L system can still be a practical choice for many small to medium homes. The better option depends on actual demand and whether the property’s gas supply, pipe sizing and water pressure can support the selected system.
Can I replace my old instant gas unit with the same size?
Replacing an old instant gas unit with the same flow rate can be practical if the system has handled the property’s demand well. It may also help keep the replacement closer to the existing installation setup.
However, the new system still needs to suit the current site. Gas type, pipe sizing, water pressure, connection positions, clearances, valves, electrical supply and compliance requirements should all be checked before installation.
Should I choose natural gas or LPG instant hot water?
Choose natural gas if your property is connected to natural gas and the selected model is designed for natural gas. Choose LPG if your property uses bottled LPG and the selected model is designed for LPG.
Natural gas and LPG models are not the same. The correct gas type must be ordered to suit the property.
Can instant gas hot water systems be installed indoors?
Most standard residential instant gas hot water systems are external outdoor units unless the product is specifically designed and approved for indoor or flued installation.
Do not install an external gas unit indoors. Indoor gas installations require the correct appliance, flueing, ventilation and compliance setup.
Is instant gas hot water suitable for rental properties?
Instant gas hot water systems can suit many rental properties, especially where the home already has a continuous flow setup and the existing system has worked well.
For rentals, the best option is usually practical, reliable and correctly sized for the expected number of occupants. A smaller rental may suit a 16L or 20L model, while a family rental may need a 26L system.
What should I check before buying an instant gas hot water system online?
Before buying an instant gas hot water system online, check the gas type, flow rate, installation location, connection positions, clearances, water pressure, gas supply, pipe sizing, 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.
Is instant gas hot water good for larger families?
Instant gas hot water can be suitable for larger families when the system is correctly sized and the property has suitable gas supply and water pressure. Larger households often compare 26L models because they offer stronger flow capacity than smaller 16L and 20L systems.
The right system still depends on how many outlets may be used at once, the number of bathrooms, incoming water temperature and site conditions.
Why Buy Instant Gas Hot Water Systems from Installed Today?
Installed Today makes it easier to compare instant gas hot water systems online by bringing natural gas, LPG, 16L, 20L and 26L continuous flow options into one collection.
You can compare trusted brands, gas types, 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 instant gas hot water systems in eligible Brisbane and Gold Coast service areas.
Whether you need a natural gas continuous flow replacement, an LPG instant hot water system, a 16L unit for a smaller home, a 26L system for a family home, or a supply-only product for your own licensed installer, this collection helps you choose an instant gas hot water system that suits the property, budget and household demand.
