26L Instant Gas Hot Water Systems From $1,199
You’re already looking at 26L instant gas hot water systems. We’ll show the three best suited options immediately, then refine them around efficiency, price, brand and your final buying preference.
Checking live booking options.
Find Your Best 26L Instant Gas System
The flow category is already decided. Now we’ll determine which 26L system best suits your priorities.
Prefer to discuss your hot water options onsite?
Book an onsite inspection and one of our plumbers can inspect your existing hot water system, check the installation requirements and talk you through the replacement options available for your home.
Ideal if you would prefer to have your existing system inspected and discuss the available options with a plumber before choosing your replacement.
Flexible payment options
Hot water from 4 easy payments of $324.75 on eligible purchases from $1,299. Pay securely with Zip, Afterpay, PayPal, Google Pay, Visa or Mastercard.
26L, 27L & 28L Instant Gas & Continuous Flow Hot Water Systems
26L, 27L and 28L instant gas hot water systems sit in the family-size end of residential continuous-flow gas. They are designed for homes needing stronger simultaneous hot water performance than 16L or 20L systems while retaining a compact wall-mounted, tankless design.
These systems are also described as 26–28L continuous flow gas hot water, instantaneous gas water heaters, tankless gas water heaters and on-demand gas hot water systems.
Current manufacturer ranges often cluster around 26L and 28L rather than providing an exact model at every individual litre rating. For sizing and buying purposes, JR treats 26L, 27L and 28L as one closely related higher-flow residential category.
JR Gas & Water supplies and installs 26–28L continuous-flow gas hot water throughout Greater Brisbane, the Gold Coast, Logan, Ipswich, Redlands, Moreton Bay and surrounding South East Queensland areas.
Why We Group 26L, 27L & 28L Gas Systems Together
One or two litres per minute is rarely enough to justify three separate buying categories.
Products in the 26L–28L range target very similar homes and should be compared on complete appliance performance rather than treating each litre number as an entirely different system class.
26L
The most common nominal size in JR's current family continuous-flow range, with broad product choice across Rinnai, Rheem, Thermann, Vulcan, Bosch, Envirosun and Onsen.
27L
A closely related search and sizing class. Exact model availability varies between manufacturer generations, so it makes more sense to compare it within the same family-flow category rather than create a thin standalone page.
28L
Provides slightly more nominal flow than 26L and includes premium options such as the Rheem Ultra 28 for homes wanting stronger higher-flow continuous gas.
Instant Gas, Continuous Flow, Tankless & On-Demand Gas Hot Water
These names generally describe the same category of gas hot water system. Water is heated as it flows through the appliance instead of being stored in a hot water cylinder.
| Term | What It Means |
|---|---|
| Instant Gas Hot Water | Common homeowner wording for gas water heated on demand. |
| Continuous Flow Gas | Common Australian industry terminology. |
| Instantaneous Gas | Technical wording for the same tankless heating principle. |
| Tankless Gas Water Heater | Common international terminology. |
| On-Demand Gas Hot Water | Describes the burner heating water when a fixture creates demand. |
What Does 26L, 27L or 28L per Minute Mean?
These figures refer to flow rate, not stored water.
A 26L continuous-flow system does not contain a 26-litre tank. The appliance heats incoming water while it passes through the heat exchanger and delivers a defined flow under specified temperature-rise conditions.
No Storage Tank
There is no finite 26L, 27L or 28L reserve inside the appliance.
Continuous Duration
The appliance can keep producing hot water while demand remains within its available heating capacity.
Flow Is Still Limited
Multiple showers and taps share the available instantaneous hot water output.
Who Are 26L–28L Continuous Flow Gas Systems Best For?
Two-Bathroom Homes
One of the strongest applications for this flow category, especially where hot water use regularly overlaps.
Selected Three-Bathroom Homes
Can suit three-bathroom properties where not every shower is expected to operate at full flow simultaneously.
Larger Families
Particularly useful where several household members create clustered morning or evening hot water demand.
Multiple Hot Outlets
Gives more available flow when shower, basin, kitchen or laundry use overlaps.
20L Upgrades
A logical step where an existing 20L-class unit is genuinely struggling with simultaneous demand.
Existing 26–28L Replacements
Often the safest starting point where the existing system has always provided satisfactory flow.
26L vs 27L vs 28L Continuous Flow Gas Hot Water
| Flow Class | Category Position | JR Buying Direction |
|---|---|---|
| 26L | Mainstream family-size continuous flow | Broadest current product choice and our main starting point |
| 27L | Same higher-flow family category | Compare directly with 26L and 28L rather than treating it as a separate household size |
| 28L | Upper end of this family-flow group | Slightly more nominal flow and selected premium options |
20L vs 26L–28L Continuous Flow Gas
Moving from 20L into the 26L–28L range is a meaningful step in simultaneous-flow capacity.
| Comparison | 20L | 26L–28L |
|---|---|---|
| Main Position | Moderate-demand crossover | Family / higher-flow category |
| One Bathroom | Very strong | Often more capacity than required |
| Two Bathrooms | Can suit moderate overlap | Stronger family starting point |
| Two Showers | Needs careful flow assessment | Better suited, subject to fixture flow and temperature rise |
| Gas Demand | Lower | Higher maximum appliance demand |
26L–28L vs 32L Continuous Flow Gas
The 32L class is the next step when even family-size 26–28L systems are becoming marginal during peak simultaneous use.
| Comparison | 26L–28L | 32L |
|---|---|---|
| Main Position | Family higher-flow | Very high residential flow |
| Two Bathrooms | Strong application | Substantial spare capacity in many homes |
| Three Bathrooms | Can suit sensible usage patterns | Stronger where simultaneous use is heavier |
| Gas Demand | High | Higher again |
| Best Reason to Choose 32L | — | 26–28L cannot comfortably support actual peak demand |
Best 26L–28L Instant Gas Hot Water Systems – JR Installer Picks
This is one of the largest instant-gas categories, with budget, mainstream, premium, smart-control and condensing options available.
Best Overall
Rinnai Infinity B26
JR's current Best Overall starting point in the 26L category. It provides family-size continuous-flow capacity, Japanese manufacture and a straightforward product position without automatically moving into premium pricing.
View Rinnai Infinity B26 →Premium Mainstream Pick
Rinnai Infinity 26
A proven premium-mainstream Rinnai option for households wanting established Infinity continuous-flow performance in the core 26L family category.
View Rinnai Infinity 26 →Best Advanced-Control Pick
Rinnai Infinity 26 Touch
A strong choice where the homeowner wants the same practical family-size flow category together with a more refined control experience.
View Rinnai Infinity 26 Touch →Best High-Efficiency Pick
Rinnai Enviro 26
The premium condensing direction for households that already know 26L-class flow suits the property and want higher-efficiency continuous-flow gas rather than additional flow capacity.
View Rinnai Enviro 26 →Best 28L High-Flow Pick
Rheem Ultra 28
The current upper end of this combined 26–28L category, providing 28L-class continuous flow, Japanese manufacture, connected-control compatibility and strong family hot water capacity.
View Rheem Ultra 28 →Efficiency & Value Alternative
Thermann 26R
A 6-star-class alternative available in Natural Gas and LPG and in applicable 50°C and 60°C configurations for homes wanting a strong balance of flow, efficiency and installed value.
View Thermann 26R →Are 26L–28L Gas Systems Suitable for Two or Three Bathrooms?
Yes, but the number of bathrooms remains only a guide.
A two-bathroom house where both showers regularly run together can create more instantaneous demand than a three-bathroom house where only one shower is normally used at a time.
Strong 26–28L Application
- Two bathrooms with regular family use.
- Two moderate-flow showers may overlap.
- Shower and kitchen demand regularly occur together.
- Three bathrooms exist but full simultaneous use is uncommon.
- Existing 26L-class system has historically performed well.
Consider 32L or Further Assessment
- Three high-flow showers regularly operate together.
- Several hot fixtures are expected to run without compromise.
- Very cold incoming-water conditions increase temperature rise.
- The existing 26L or 28L system already feels flow-limited.
- The property has unusually heavy peak hot water demand.
Size 26L–28L Continuous Flow by Simultaneous Demand, Not People
A current Rheem 26 product may be recommended across a broad household size range, but occupant count alone does not determine whether the appliance can meet peak demand.
| Example | What the Heater Sees |
|---|---|
| Seven people shower one after another | Long operating duration but only one shower load at a time |
| Two people shower at once | Both shower flow rates need to be supplied simultaneously |
| One shower + kitchen + basin | Several smaller demands combine into one total flow requirement |
| Three showers at once | Potentially beyond what this category can comfortably support depending on fixture flows |
Temperature Rise Changes 26L–28L Gas Hot Water Performance
The flow figure is measured under specific conditions. Available hot water flow changes as the required temperature rise changes.
Warm Incoming Water
Requires less heating to reach the target outlet temperature.
Cold Incoming Water
Requires more burner output per litre and reduces the amount of water that can be heated to the same target temperature.
More Outlets
Every additional fixture contributes to the total flow the heater needs to supply at the same time.
High-Efficiency 26L Continuous Flow Gas
The family-flow category also includes premium condensing gas options.
Rinnai Enviro 26 retains the same basic 26L-class sizing intent while using condensing technology to recover additional heat from the combustion exhaust.
Standard 26L
Lower upfront product position with conventional continuous-flow gas technology.
Condensing 26L
Higher-efficiency premium technology with additional exhaust-heat recovery and condensate requirements.
Smart Controls on 26L–28L Continuous Flow Gas
Selected systems in this size range provide more advanced controller or connected-control functionality.
Rinnai Infinity 26 Touch is specifically aimed at customers wanting a more refined control experience, while JR currently lists Rheem Ultra 28 as Wi-Fi-controller compatible.
50°C vs 60°C 26L–28L Continuous Flow Gas
Different temperature configurations are available across the family-size gas range.
Thermann 26R, for example, is available in applicable 50°C and 60°C configurations, while Rheem Ultra 28 is currently offered by JR as a 50°C preset model.
50°C Preset
Useful for applicable domestic sanitary installations where a temperature-limited model suits the plumbing design.
60°C / Higher Distribution Temperature
May suit other plumbing arrangements, with appropriate downstream temperature control where required.
Gas Supply Is Critical on 26L–28L Continuous Flow Systems
This is where gas supply becomes particularly important.
A family-size continuous-flow system has to create a large amount of heat instantly. Moving from a 12L, 16L or 20L unit to 26L–28L can materially increase the appliance's maximum gas demand.
JR Checks:
- Natural Gas or LPG.
- Selected appliance maximum gas demand.
- Gas-pipe length and diameter.
- Available gas pressure.
- Gas meter or LPG regulator arrangement.
- Other gas appliances connected to the installation.
- Whether an old smaller instantaneous unit is being upsized.
Natural Gas vs LPG 26L–28L Continuous Flow Hot Water
Applicable systems in this category are available in Natural Gas and LPG-specific configurations.
Natural Gas
Common where reticulated gas already supplies the property. Gas meter and pipe capacity still need to support the selected high-flow unit.
LPG
Suitable for LPG properties where cylinder supply, regulator capacity and total appliance demand are correctly designed for the system.
26L–28L Continuous Flow Gas vs Gas Storage
| Comparison | 26L–28L Continuous Flow | Gas Storage |
|---|---|---|
| Storage Tank | No | Yes |
| Sizing | Simultaneous flow + temperature rise | Storage volume + recovery |
| Hot Water Duration | Continuous within flow capacity | Limited by stored reserve and recovery |
| Footprint | Compact wall-mounted system | Larger ground-mounted tank |
| Main Family Advantage | Strong on-demand flow without storing hundreds of litres | Stored reserve available for short heavy demand |
Replacing an Existing 26L, 27L or 28L Gas Water Heater
If an existing family-size continuous-flow system has always supplied enough hot water, staying within the 26L–28L class is normally the first replacement direction worth considering.
JR Checks:
- Existing model and actual flow class.
- Whether household demand has changed.
- Natural Gas or LPG.
- Existing gas supply capacity.
- Hot and cold water connection positions.
- Electrical supply requirements.
- 50°C or 60°C requirements.
- Whether the replacement is standard or condensing.
- Condensate requirements on an Enviro upgrade.
- Whether moving to 32L provides any genuine benefit.
How Much Does a 26L–28L Instant Gas Hot Water System Cost?
JR displays current installed pricing in the live product range above rather than hardcoding prices into this lower-page content.
What Can Change the Installed Price?
- 26L, 27L or 28L flow class.
- Brand and model.
- Natural Gas or LPG.
- Existing gas supply capacity.
- Gas-line upgrade requirements.
- Existing hot and cold water connections.
- Electrical supply.
- 50°C or 60°C configuration.
- Condensate drainage on condensing systems.
- Like-for-like replacement versus relocation.
- Conversion from gas storage or electric hot water.
26L–28L Continuous Flow Gas Installation Brisbane & Gold Coast
JR Gas & Water supplies and installs family-size continuous-flow gas hot water systems throughout Brisbane and the Gold Coast.
1. Measure Demand
Work out the actual simultaneous fixture load before selecting the final flow class.
2. Choose the System
Compare standard, premium, smart-control and condensing products.
3. Check Gas Supply
Confirm fuel type and whether the existing gas installation can support the appliance.
4. Check Services
Assess plumbing, power, mounting position, temperature configuration and drainage where required.
5. Install & Connect
Complete required gas, water, electrical and mounting work.
6. Test & Commission
Confirm burner performance, flow, temperature and finished installation operation.
26L–28L Continuous Flow Gas Hot Water Brisbane & Gold Coast
26L–28L Instant Gas Brisbane
JR Gas & Water supplies and installs family-size continuous-flow gas hot water throughout Greater Brisbane, including Brisbane City, Brisbane North, Brisbane South, Logan, Ipswich, Redlands and surrounding areas.
These systems are particularly useful for two-bathroom homes and larger families needing more simultaneous flow than the 16L or 20L categories provide.
View Brisbane Hot Water Installation →26L–28L Instant Gas Gold Coast
JR Gas & Water installs 26L–28L instantaneous and continuous-flow gas systems throughout the Gold Coast for family homes requiring strong on-demand hot water delivery.
We assess actual simultaneous demand and gas-supply capacity before recommending whether 26L, 28L or the larger 32L category makes most sense.
View Gold Coast Hot Water Installation →What We Have Learned Installing 26L–28L Continuous Flow Gas
This Is the Family Sweet Spot
For many two-bathroom homes, 26L-class continuous flow provides the right balance between strong flow and avoiding unnecessary 32L capacity.
26 vs 28 Is Usually Not the Biggest Decision
The two-litre difference can matter, but product quality, gas demand, controls and installation suitability often matter more.
Bathroom Count Can Mislead
A three-bathroom home where one shower normally operates at a time may need less instantaneous flow than a two-bathroom home where both showers run together every morning.
Gas Supply Is Often the Limiting Factor
Upsizing from an old small instantaneous system can require far more gas-service work than homeowners expect.
Do Not Automatically Upgrade to 32L
If an existing 26L system comfortably meets demand, a better 26L or 28L replacement often makes more sense than purchasing unused flow.
Existing Performance Is Valuable Evidence
A correctly operating old 26L system that has never struggled tells us a lot about the real flow requirement of the home.
26L, 27L & 28L Instant Gas Hot Water FAQs
Is 26L instant gas enough for two bathrooms?
Yes, 26L is one of JR's main starting points for two-bathroom family homes. Actual suitability depends on whether showers and other fixtures operate simultaneously and their flow rates.
Is 26L instant gas enough for three bathrooms?
It can be where all three bathrooms are not used heavily at the same time. For regular multi-shower use, compare the actual fixture flow against larger continuous-flow systems.
Can two showers run from a 26L gas system?
Often yes, depending on shower flow, incoming water temperature and required outlet temperature. Continuous-flow sizing should still be based on the combined litres per minute required at peak demand.
Can three showers run from a 26L system?
That can exceed the comfortable capability of a 26L-class system, particularly with higher-flow showers. If three showers genuinely operate together, a larger system should be assessed.
What is the difference between 26L, 27L and 28L instant gas?
The nominal flow rate differs slightly, but they occupy essentially the same family-size residential continuous-flow category. Product design, efficiency, gas demand, controls and installation fit can matter more than one or two litres per minute.
Is a 28L gas water heater much better than 26L?
It provides slightly more nominal flow, but the difference is much smaller than moving from 20L into the 26–28L category. Choose the complete appliance rather than assuming 28L is automatically better.
Why are 26L, 27L and 28L on the same page?
They target essentially the same family and higher-flow residential application. Manufacturer ranges also vary, with some using 26L and others offering 28L-class systems rather than an exact size at every single litre increment.
Does a 26L gas system store 26 litres?
No. It is a tankless continuous-flow heater. The litre number describes flow-rate performance under specified conditions rather than stored hot water volume.
Is continuous flow the same as instant gas?
Yes. Instant gas, continuous flow, instantaneous gas, tankless gas and on-demand gas are commonly used to describe the same general hot water technology.
Can a 26L system run out of hot water?
It does not run empty like a storage tank. It can continue heating while hot water is being used, provided the total flow remains within the appliance's heating capacity.
How many people can use a 26L gas water heater?
Occupant count is only a rough guide. JR's current Rheem 26 data covers a broad household range, but simultaneous fixture flow is the more important sizing factor.
Should I choose 20L or 26L instant gas?
Choose 20L for moderate demand and 26L where multiple fixtures or showers create a stronger peak load. Do not upsize based on occupant count alone.
Should I choose 26L or 32L instant gas?
Choose 26L–28L where it comfortably covers peak flow. Move to 32L where genuine simultaneous demand exceeds what the family-size category can provide.
What is the best 26L instant gas hot water system?
JR currently positions Rinnai Infinity B26 as its Best Overall starting point. Infinity 26 provides a premium-mainstream direction, while Enviro 26 is the high-efficiency condensing choice.
What is the best 28L instant gas hot water system?
Rheem Ultra 28 is JR's current 28L gas continuous-flow option and is aimed at homes wanting higher family flow, Japanese manufacture and a premium product position.
Is Rinnai B26 good?
Yes. JR currently positions Rinnai B26 as its Best Overall system in the live 26L collection and a strong family-size continuous-flow starting point.
Is Rinnai Enviro 26 more efficient?
Enviro 26 uses condensing continuous-flow technology designed to recover additional heat from the combustion exhaust, placing it in JR's premium high-efficiency gas range.
Does Rinnai Enviro 26 need a condensate drain?
Yes. Condensing technology produces condensate as exhaust heat is recovered, so the installation requires an appropriate condensate arrangement.
Is Rheem Ultra 28 a 28L system?
Yes. JR's current Rheem Ultra product is specified at 28L and model 874627. Its existing Shopify URL still contains “27”, but the current product itself is listed as Rheem Ultra 28.
Does Rheem Ultra 28 have Wi-Fi compatibility?
JR currently lists the Rheem Ultra 28 as compatible with a Wi-Fi controller.
Can 26L and 28L systems run on LPG?
Applicable products are available in fuel-specific Natural Gas and LPG configurations. The correct model and gas installation must suit the property's fuel supply.
Does upgrading from 20L to 26L need a bigger gas pipe?
It may. The new appliance can have a higher maximum gas demand, so pipe size, pipe length, meter or regulator capacity and other gas appliances need to be considered.
Can I replace a 26L system with a 28L unit?
Potentially. The gas demand, connection positions, power requirements and overall installation need to be checked rather than assuming the extra nominal flow makes it an identical swap.
How much does a 26L–28L gas hot water system cost installed?
Installed pricing depends on the product, fuel type, existing gas supply, plumbing and installation scope. JR displays current live installed pricing in the product range above.
Do you install 26L–28L instant gas in Brisbane and Gold Coast?
Yes. JR Gas & Water supplies and installs family-size instant and continuous-flow gas systems throughout Greater Brisbane, the Gold Coast, Logan, Ipswich, Redlands, Moreton Bay and surrounding South East Queensland service areas.
Compare Instant & Continuous Flow Gas Hot Water by Size
Choose Your 26L, 27L or 28L Continuous Flow Gas System
Compare family-size instant gas systems, 26L–28L flow classes, standard and condensing technology, smart controls, Natural Gas and LPG options and current installed pricing above. If you are unsure whether your home needs 20L, 26–28L or 32L, book an onsite quote assessment so JR can check actual hot water demand and the existing gas supply before you choose.