Best 26L Instant Gas Hot Water System: Rinnai Infinity 26 vs Rinnai B26 vs Rheem Metro 26 vs Dux 26

Choosing the best 26L instant gas hot water system usually comes down to a few common names: Rinnai Infinity 26, Rinnai B26, Rheem Metro 26 and Dux 26. These systems are all designed for homes that want continuous flow gas hot water without storing a full tank of heated water.

For customers comparing products online, Installed Today’s 26L Instant Gas Hot Water Systems category is the best starting point. Current options include the Rinnai Infinity B26 Natural Gas Hot Water System, Rinnai Infinity B26 LPG Gas Hot Water System, Rheem 26L Natural Gas Hot Water System and Rheem 26L LPG Gas Hot Water System.

The right choice depends on your gas type, household size, water pressure, pipe sizing, installation location, warranty preference, budget and whether you are replacing an existing 26L continuous flow unit.

Quick Answer

Best overall premium pick: Rinnai Infinity 26

Best value Rinnai option: Rinnai B26

Best mainstream alternative: Rheem Metro 26

Best comparison brand to check: Dux 26, where available

Best for family homes: 26L instant gas systems where the gas supply, pipe sizing and water pressure are suitable

Main thing to check: natural gas and LPG models are not interchangeable

Best categories to compare: Instant Gas Hot Water Systems, 26L Instant Gas Hot Water Systems, Gas Hot Water Systems, Rinnai Hot Water Systems and Rheem Hot Water Systems

What Is a 26L Instant Gas Hot Water System?

A 26L instant gas hot water system is a continuous flow water heater. It 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. This means there is no large storage tank constantly holding hot water.

The 26L rating refers to the system’s nominal flow capacity under suitable conditions. In practical terms, 26L models are often chosen for larger homes, family households, rental properties and homes with more than one bathroom.

A 26L system may suit homes that:

already have natural gas or LPG
are replacing an existing 26L instant gas unit
want stronger hot water flow than a 16L or 20L model
have medium to higher hot water demand
want a compact wall-mounted outdoor system
do not want a gas storage tank
want continuous flow hot water

If the home has lower hot water demand, a 16L or 20L model may be enough. Bigger is not always better if the gas supply, pipe sizing or household usage does not justify it.

Rinnai Infinity 26 Overview

The Rinnai Infinity 26 is one of the best-known 26L continuous flow gas hot water systems in Australia. It is often compared by homeowners who want a premium Rinnai instant gas option with strong brand recognition, compact design and dependable hot water performance.

It may suit:

family homes
larger townhouses
rental properties
homes replacing an older Rinnai Infinity
customers wanting a recognised instant gas brand
households wanting continuous flow gas hot water
properties already set up for natural gas or LPG

The Rinnai Infinity 26 is generally the option to consider if you want Rinnai’s stronger brand reputation and are happy to pay for a well-known continuous flow gas system.

For current Rinnai options stocked through Installed Today, compare the Rinnai Infinity B26 Natural Gas Hot Water System and Rinnai Infinity B26 LPG Gas Hot Water System.

Rinnai B26 Overview

The Rinnai B26 is a practical 26L continuous flow gas hot water option. It is often chosen by customers who want a reliable Rinnai unit at a sharper price point than premium-style comparisons.

The B26 may suit:

homes replacing an existing 26L gas continuous flow system
medium to larger households
customers wanting a value-focused Rinnai option
properties with suitable gas supply and pipe sizing
natural gas or LPG homes
customers wanting compact external gas hot water

The main appeal of the Rinnai B26 is value. It gives customers a recognised Rinnai 26L continuous flow option without overcomplicating the decision.

Rheem Metro 26 Overview

The Rheem Metro 26 is a strong alternative to Rinnai for customers who want a 26L continuous flow gas system from another major hot water brand.

It may suit:

family homes
larger units and townhouses
customers replacing an older Rheem gas continuous flow unit
properties already set up for gas hot water
customers wanting a recognised mainstream brand
landlords and property managers comparing 26L options

Installed Today currently lists both the Rheem 26L Natural Gas Hot Water System and Rheem 26L LPG Gas Hot Water System, making it easy to compare against the Rinnai B26 options.

The Rheem Metro 26 is often a good choice where price, availability, warranty, installation suitability and brand preference line up.

Dux 26 Overview

Dux 26 instant gas systems are part of the broader 26L continuous flow comparison, especially for homeowners who want to compare all major hot water brands before ordering.

Dux may suit customers who:

already have a Dux continuous flow system
want to compare Rinnai, Rheem and Dux
prefer Dux as a brand
are working with an installer who recommends a Dux model
want a 26L gas continuous flow system where available

Installed Today’s current Dux range is best checked through the Dux Hot Water Systems collection, as product availability can change.

Rinnai Infinity 26 vs Rinnai B26

The Rinnai Infinity 26 and Rinnai B26 are often compared because both sit in the 26L instant gas conversation.

The Rinnai Infinity 26 is usually seen as the premium Rinnai comparison point. The Rinnai B26 is often viewed as the more value-focused Rinnai option.

For most households, both options need the same core checks: gas type, pipe sizing, water pressure, installation location, clearances and temperature setting requirements.

Rinnai B26 vs Rheem Metro 26

The Rinnai B26 and Rheem Metro 26 are two of the strongest 26L instant gas options to compare.

Choose the Rinnai B26 if:

you prefer Rinnai
you are replacing an older Rinnai unit
you want a value-focused Rinnai 26L option
your installer recommends Rinnai for the site
the Rinnai model suits the installation location

Choose the Rheem Metro 26 if:

you prefer Rheem
you are replacing an older Rheem unit
you want a competitive 26L gas system
you like Rheem’s hot water brand presence
the Rheem model suits the site and gas type

Both can be good choices. The better option depends on price, availability, gas type, installation setup and household demand.

Rheem Metro 26 vs Dux 26

The Rheem Metro 26 and Dux 26 are both mainstream alternatives to Rinnai.

Rheem may appeal to customers who want one of Australia’s most familiar hot water brands and a wide product range across electric, gas, storage and heat pump systems.

Dux may appeal to customers who already have a Dux system, prefer the brand, or want to compare more hot water system options before making a decision.

When comparing Rheem and Dux, check:

natural gas or LPG availability
warranty terms
model dimensions
controller options
price
stock availability
installation suitability
clearance requirements
gas supply and pipe sizing
installer recommendation

If the Dux 26 product is not currently listed or available, the Rheem 26L and Rinnai B26 options may be easier to compare and order online.

Which 26L Instant Gas System Is Best Overall?

For most customers, the best overall choice will be either Rinnai B26 or Rheem Metro 26 because they are easy to compare, commonly searched and currently available through Installed Today in both natural gas and LPG options.

The Rinnai Infinity 26 is the strongest premium-style comparison if you want Rinnai’s well-known continuous flow reputation.

The Rinnai B26 is a strong value pick if you want a practical 26L Rinnai system.

The Rheem Metro 26 is a strong mainstream alternative if you prefer Rheem or want a competitive 26L gas continuous flow model.

The Dux 26 is worth comparing where available, especially if you already have a Dux system or want to compare all major brands.

Natural Gas vs LPG: Do Not Order the Wrong Model

This is one of the most important parts of choosing a 26L gas hot water system.

Natural gas and LPG are not the same. The models are different and must be ordered correctly.

Natural gas models suit homes connected to a mains natural gas supply.

LPG models suit homes using bottled LPG.

Installed Today currently lists:

Rinnai Infinity B26 Natural Gas Hot Water System
Rinnai Infinity B26 LPG Gas Hot Water System
Rheem 26L Natural Gas Hot Water System
Rheem 26L LPG Gas Hot Water System

Ordering the wrong gas type can delay installation, create extra costs or require a product exchange. Always confirm the gas type before ordering.

Is 26L Big Enough for a Family?

A 26L instant gas hot water system can suit many family homes, but it depends on the property.

A 26L model may suit:

medium to larger households
homes with more than one bathroom
families with higher shower demand
rental properties
larger townhouses
homes replacing an existing 26L unit that worked well
customers wanting stronger flow than a 16L or 20L unit

A 26L model may not be needed for:

small units
couples
granny flats
low-use households
homes with one bathroom and short showers
properties with gas supply limitations

The unit size is only one part of the decision. Gas pipe sizing, water pressure, incoming water temperature and simultaneous outlet use all affect real-world performance.

26L Instant Gas vs Gas Storage Hot Water

A 26L instant gas system and a gas storage system work differently.

A gas storage system heats and stores water in a tank. It is familiar and can suit homes already set up for storage, but it takes up more space and keeps stored water hot.

A 26L instant gas system heats water only when a hot tap is used. It is compact and wall-mounted, but it needs suitable gas supply and water flow.

If you want a compact wall-mounted replacement, 26L instant gas may be suitable. If you prefer a tank-style system, browse Gas Hot Water Systems before deciding.

26L Instant Gas vs Heat Pump Hot Water

Heat pump hot water is worth comparing if your goal is reducing running costs or moving away from gas.

A 26L instant gas system can be better if:

the home already has gas
you want compact continuous flow hot water
you do not want a storage tank
you are replacing an existing instant gas unit
you want strong hot water flow where gas supply supports it

A heat pump may be better if:

the home has rooftop solar
you want to reduce gas use
you have suitable outdoor space and airflow
you want lower electricity use than standard electric storage
you are comfortable with fan and compressor noise

For broader system comparisons, browse Installed Today’s full Hot Water Systems range.

Supply Only vs Supplied and Installed

Installed Today offers supply-only ordering for customers who already have their own licensed installer arranged. Supply-only pricing is for the product only and does not include installation, valves, gas work, electrical work, pipework changes, drainage work, old unit removal, disposal, wall mounting changes or compliance upgrades unless those options are clearly selected or shown on the product page.

Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast service areas. Availability depends on the product, location, gas type, access, existing setup, gas supply, pipe sizing, water pressure, required extras and site requirements.

Before ordering supply only, make sure your licensed gas fitter has confirmed the correct gas type, model size, installation location, pipe sizing, controller requirements and compliance needs.

Brisbane and Gold Coast Buying Context

For Brisbane and Gold Coast homes, 26L instant gas systems are commonly chosen for family homes, larger townhouses, rental properties and homes replacing older continuous flow gas units.

Local homes should check:

whether the property uses natural gas or LPG
whether the existing unit is 20L, 24L or 26L
whether the old system supplied enough hot water
whether the gas supply supports a 26L model
whether pipe sizing is suitable
whether the installation location meets clearance requirements
whether water pressure is suitable
whether controller changes are required
whether supplied-and-installed is available for the address
whether supply only is preferred because a licensed installer is already arranged

A 26L model can be a strong choice, but only if the gas and water supply can support it.

Common 26L Instant Gas Problems to Watch For

Common issues with instant gas hot water systems include:

no hot water
hot water cutting in and out
temperature fluctuation
low flow problems
fault codes
blocked inlet filters
controller issues
incorrect gas type
undersized gas pipework
water pressure problems
gas supply issues
clearance problems
installation faults

Many problems are site-related rather than brand-related. A good system can still perform badly if the gas supply, pipe sizing or water pressure is not suitable.

Gas hot water repairs and installation work should only be handled by licensed professionals.

Before Ordering Checklist

Before ordering a 26L instant gas hot water system, check:

whether your home uses natural gas or LPG
whether your existing system is 20L, 24L or 26L
whether the old system supplied enough hot water
how many bathrooms your home has
how many outlets may run at the same time
whether the unit will be installed externally
whether the wall location suits the selected model
whether gas pipe sizing is suitable
whether water pressure is suitable
whether controller wiring is needed
whether a tempering valve is required
whether supplied-and-installed is available
whether your licensed installer has confirmed suitability

This helps avoid ordering the wrong gas type, wrong flow rate or wrong model for the property.

Which 26L Instant Gas Hot Water System Should You Choose?

Choose Rinnai Infinity 26 if you want a premium Rinnai continuous flow gas option and are comfortable paying more for Rinnai’s brand reputation.

Choose Rinnai B26 if you want a strong value-focused Rinnai 26L instant gas system.

Choose Rheem Metro 26 if you want a competitive 26L continuous flow model from another major hot water brand.

Compare Dux 26 where available if you want to review all major 26L gas hot water brands before ordering.

For most Installed Today customers, the best starting point is to compare the current 26L Instant Gas Hot Water Systems category, then confirm the correct gas type and installation suitability before ordering.

Long-Tail FAQs

Is Rinnai B26 the same as Rinnai Infinity 26?

They are closely related in the way customers compare them, but product naming and model details can vary by listing and market. The safest approach is to compare the exact product page, gas type, model number, warranty, dimensions and installation requirements before ordering.

Is Rinnai B26 better than Rheem Metro 26?

The Rinnai B26 may be better if you prefer Rinnai or are replacing an existing Rinnai unit. The Rheem Metro 26 may be better if you prefer Rheem or want a competitive alternative. Both should be compared based on gas type, price, availability, warranty, installation suitability and household demand.

Is a 26L instant gas hot water system enough for two bathrooms?

A 26L system may suit many two-bathroom homes, but it depends on simultaneous use, shower flow rates, incoming water temperature, gas supply and pipe sizing. A licensed installer should confirm whether the property can support the selected model.

Should I choose natural gas or LPG?

Choose natural gas if your property is connected to mains natural gas. Choose LPG if your property uses bottled gas. The two models are not interchangeable, so the gas type must be confirmed before ordering.

Is instant gas cheaper to run than gas storage?

Instant gas can avoid some standing heat loss because it heats water only when needed. Running costs still depend on gas prices, usage, shower habits, model efficiency and household demand. Gas storage may still suit customers who prefer tank-style hot water.

Can I buy a 26L instant gas hot water system supply only?

Yes. Supply only is suitable if you already have your own licensed gas fitter or plumber arranged. The product price is for the unit only and does not include installation, valves, gas work, electrical work, disposal, pipework changes or compliance upgrades unless selected separately.

Can I order a 26L instant gas hot water system supplied and installed?

Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast service areas. Availability depends on the address, gas type, access, existing setup, gas supply, pipe sizing, water pressure and required extras.

What is the main downside of a 26L instant gas system?

The main downside is that performance depends heavily on gas supply, pipe sizing, water pressure and correct installation. A 26L unit may not perform as expected if the property cannot support the required flow and gas demand.

Final Word

Rinnai Infinity 26, Rinnai B26, Rheem Metro 26 and Dux 26 all belong in the 26L instant gas hot water conversation, but the best choice depends on the home.

The Rinnai Infinity 26 is the premium-style Rinnai comparison. The Rinnai B26 is the value-focused Rinnai option. The Rheem Metro 26 is a strong mainstream alternative. Dux 26 is worth comparing where available, especially if you already have a Dux system or want to compare all major brands.

For most homes, the smartest step is to confirm gas type first, then compare product size, price, warranty, installation suitability and brand preference.

Browse the Rinnai Infinity B26 Natural Gas Hot Water System, Rinnai Infinity B26 LPG Gas Hot Water System, Rheem 26L Natural Gas Hot Water System, Rheem 26L LPG Gas Hot Water System, or compare the full 26L Instant Gas Hot Water Systems range before ordering.