Best Gas Storage Hot Water System: Vulcan 135L vs Rinnai Hotflo vs Rheem Stellar 330 vs Aquamax G270SS
Choosing the best gas storage hot water system usually comes down to household size, gas type, storage capacity, energy rating, installation location and budget. Four common systems people compare are the Vulcan 4-Star 135L, Rinnai Hotflo 130L/135L, Rheem Stellar 330 and Aquamax G270SS.
For customers comparing gas storage systems online, Installed Today’s Gas Hot Water Systems range and 130/135L Gas Hot Water Systems category are the best starting points. Current options include the Vulcan 4-Star 135L Natural Gas Hot Water System, Vulcan 4-Star 135L LPG Gas Hot Water System, Rheem Stellar 330 Natural Gas Hot Water System, plus broader Rinnai Hot Water Systems and Aquamax Hot Water Systems collections where availability can vary.
The right system depends on whether you want a compact replacement, a value-focused gas storage unit, a higher-performance 5-star model or a premium stainless steel gas storage option.
Quick Answer
Best overall performance option: Rheem Stellar 330
Best compact replacement option: Vulcan 4-Star 135L
Best value-focused comparison option: Rinnai Hotflo 130L/135L
Best premium stainless steel comparison option: Aquamax G270SS, where available
Best for larger households: Rheem Stellar 330 or Aquamax G270SS
Best for small to medium households: Vulcan 135L or Rinnai Hotflo 130L/135L
Best category to compare: Gas Hot Water Systems
Main thing to check: natural gas and LPG models are not interchangeable
What Is a Gas Storage Hot Water System?
A gas storage hot water system heats and stores water inside a tank. The gas burner reheats the water as the household uses hot water through showers, taps, kitchens and laundries.
This is different from an instant gas system, which heats water only as it flows through the unit. A storage system keeps a set amount of hot water ready for use.
Gas storage systems are often chosen for:
like-for-like replacements
homes already set up for gas storage
small to medium family homes
rental properties
customers who prefer tank-style hot water
properties where instant gas pipework upgrades may not be practical
homes where a stored reserve of hot water is preferred
If you are not sure whether gas storage or instant gas is better, compare the broader Hot Water Systems range before ordering.
Vulcan 4-Star 135L Overview
The Vulcan 4-Star 135L is a compact gas storage hot water system suited to small and medium households that want a practical tank-style replacement.
Installed Today currently lists both the Vulcan 4-Star 135L Natural Gas Hot Water System and the Vulcan 4-Star 135L LPG Gas Hot Water System, which makes it easier to choose the correct gas type.
The Vulcan 135L may suit:
homes replacing an old 130L or 135L gas storage unit
small to medium households
townhouses
rental properties
customers wanting a value-focused gas storage option
properties already set up for natural gas or LPG
homes where a larger 170L or 330L model is not needed
The main advantage is simplicity. The Vulcan 135L is a practical replacement option, especially where the existing system was already a similar size and met the household’s needs.
Rinnai Hotflo 130L/135L Overview
The Rinnai Hotflo 130L/135L gas storage range is commonly compared against Vulcan, Rheem and Aquamax because it sits in the compact gas storage category.
It may suit:
small to medium homes
customers replacing an older Rinnai gas storage unit
properties where a 130L or 135L tank is enough
landlords comparing value-focused systems
customers who prefer Rinnai as a brand
homes already set up for gas storage hot water
Current product availability can change, so the best Installed Today starting point is the Rinnai Hot Water Systems collection or the 130/135L Gas Hot Water Systems category.
The main appeal of Rinnai Hotflo is value and brand recognition. It can be a sensible option when the household does not need a larger or premium gas storage system.
Rheem Stellar 330 Overview
The Rheem Stellar 330 Natural Gas Hot Water System is the high-performance option in this comparison. It is designed for households wanting strong hot water recovery, higher efficiency than basic 4-star storage systems and a larger first-hour hot water delivery profile.
It may suit:
medium to larger households
homes with higher shower demand
families wanting stronger recovery than compact gas storage
customers replacing an older high-performance gas storage unit
homes already connected to natural gas
customers wanting a premium Rheem gas storage option
The Rheem Stellar 330 is usually the best choice in this comparison where performance matters more than lowest upfront price.
It is not the cheapest option, and it may be more system than a small household needs. But for homes that regularly use more hot water, it can make more sense than repeatedly pushing a smaller 135L storage tank to its limit.
Aquamax G270SS Overview
The Aquamax G270SS is often discussed as a premium stainless steel gas storage system. It is known for combining strong hot water delivery with stainless steel cylinder construction.
Availability can vary, so customers should check the Aquamax Hot Water Systems collection and the broader Gas Hot Water Systems range before deciding.
The Aquamax G270SS may suit:
larger households
customers wanting premium gas storage
homes with higher hot water demand
customers comparing stainless steel cylinder options
properties where strong recovery is important
households that prefer gas storage over instant gas
The main advantage is premium performance and stainless steel positioning. The main limitation is availability, price and whether the household genuinely needs that level of system.
Comparison Table
| System | Best For | Main Advantage | Main Limitation |
|---|---|---|---|
| Vulcan 4-Star 135L | Compact gas storage replacement | Practical value-focused option | Smaller storage capacity |
| Rinnai Hotflo 130L/135L | Value-focused compact gas storage | Recognised brand, practical replacement | Availability can vary |
| Rheem Stellar 330 | Higher-demand households | Strong performance and recovery | Higher upfront cost |
| Aquamax G270SS | Premium gas storage buyers | Stainless steel and high-performance positioning | Availability and price |
There is no single winner for every home. The best option depends on whether you need compact value, stronger performance, premium construction or a like-for-like replacement.
Which Gas Storage System Is Best Overall?
The Rheem Stellar 330 is the best overall performance choice in this comparison. It is better suited to households that need stronger hot water delivery and do not want to rely on a smaller 130L or 135L tank.
The Vulcan 135L is the best compact replacement choice where the existing gas storage system was already similar in size and worked well for the household.
The Rinnai Hotflo 130L/135L is a strong value comparison if available and suitable for the site.
The Aquamax G270SS is the premium stainless steel comparison option where available, especially for households that want stronger long-term gas storage performance.
Vulcan 135L vs Rinnai Hotflo 130L/135L
The Vulcan 135L and Rinnai Hotflo 130L/135L are the closest compact gas storage competitors in this comparison.
Choose Vulcan 135L if:
you want a currently listed compact gas storage option
you need natural gas or LPG choice
you are replacing a similar 135L tank
you want a value-focused system
your household has moderate hot water demand
Choose Rinnai Hotflo 130L/135L if:
you prefer Rinnai
you are replacing an older Rinnai gas storage unit
the model is available in the right gas type
your household demand suits a compact tank
your installer recommends it for the site
Both are best suited to smaller or moderate-demand homes. If the old compact gas storage system regularly ran out of hot water, a higher-capacity option should be compared.
Vulcan 135L vs Rheem Stellar 330
The Vulcan 135L and Rheem Stellar 330 suit different households.
The Vulcan 135L is a compact, practical gas storage option. It is better for smaller households, rentals, townhouses and customers who want a straightforward replacement.
The Rheem Stellar 330 is a higher-performance gas storage system. It is better for households with stronger hot water demand, more frequent shower use or customers wanting stronger first-hour delivery.
Choose Vulcan 135L if:
upfront value matters most
the existing 135L system was enough
the household has moderate demand
space is limited
you want natural gas or LPG options
Choose Rheem Stellar 330 if:
hot water demand is higher
the home has more people
you want stronger recovery
you prefer a premium Rheem system
natural gas is available
you want better performance than a compact 4-star tank
If you are choosing between these two, the decision usually comes down to household demand and budget.
Rheem Stellar 330 vs Aquamax G270SS
The Rheem Stellar 330 and Aquamax G270SS are the premium-style options in this comparison.
The Rheem Stellar 330 is a strong choice for customers wanting a well-known Rheem gas storage system with high performance and strong recovery.
The Aquamax G270SS is often compared by customers wanting a stainless steel gas storage system with premium positioning.
Choose Rheem Stellar 330 if:
you prefer Rheem
you want a currently listed product option
you need strong gas storage performance
you want a high-demand household solution
you are comfortable with natural gas
Choose Aquamax G270SS if:
you want a premium stainless steel gas storage comparison
availability suits your area
your installer recommends it
you want to compare premium options before ordering
you are focused on long-term gas storage performance
Both are stronger choices than compact 135L systems for higher-demand households.
Rinnai Hotflo vs Rheem Stellar 330
The Rinnai Hotflo 130L/135L and Rheem Stellar 330 are not equal-capacity systems, so they should not be judged only on price.
The Rinnai Hotflo is better for compact replacement and lower to moderate demand.
The Rheem Stellar 330 is better for stronger hot water performance and larger household demand.
If a compact Rinnai system has always kept up with the household, it may be enough. If the home regularly runs short of hot water, stepping up to a system like the Rheem Stellar 330 may be a better long-term choice.
Gas Type: Natural Gas vs LPG
Gas type is critical.
Natural gas systems are for homes connected to mains natural gas.
LPG systems are for homes using bottled LPG.
The two are not interchangeable. Ordering the wrong gas type can delay installation, require a product change or create extra costs.
Before ordering, check:
whether the property uses natural gas or LPG
whether the selected model is available in that gas type
whether the existing system is natural gas or LPG
whether the installer has confirmed compatibility
whether gas pipework and pressure are suitable
For compact Vulcan options, Installed Today currently lists both Vulcan 4-Star 135L Natural Gas and Vulcan 4-Star 135L LPG product pages.
Is a 135L Gas Storage System Big Enough?
A 135L gas storage system can suit some small to medium households, but it is not right for every home.
It may suit:
couples
small families
townhouses
rental properties
homes with one bathroom
moderate shower use
properties replacing a similar 135L unit that worked well
It may not suit:
larger families
homes with multiple bathrooms
long back-to-back showers
heavy bath use
high morning or evening demand
households that already run out of hot water
If the old 135L system struggled, do not assume a new 135L system will solve the issue. Compare larger gas storage options before ordering.
When Should You Choose Rheem Stellar 330?
The Rheem Stellar 330 makes sense when a compact gas storage system is not enough.
It may be the better choice if:
the household uses more hot water
there are more people in the home
multiple showers are common
the old system ran short
you want stronger recovery
you prefer Rheem as a brand
the property is connected to natural gas
you want a higher-performance gas storage option
It may not be necessary if the home has low hot water use or a compact system has always worked well.
When Should You Choose Aquamax G270SS?
The Aquamax G270SS is worth considering where available if the household wants a premium gas storage system and is comparing long-term performance, stainless steel construction and strong hot water delivery.
It may suit:
higher-demand homes
customers wanting premium gas storage
households comparing Rheem Stellar alternatives
properties where stainless steel construction is preferred
customers who do not want instant gas or heat pump hot water
Because availability can change, use the Aquamax Hot Water Systems collection and Gas Hot Water Systems category to check current options.
Gas Storage vs Instant Gas Hot Water
Before choosing a gas storage system, it is worth comparing instant gas hot water.
Gas storage systems heat and store water inside a tank. They are familiar, practical and often easier for like-for-like replacements.
Instant gas systems heat water only as it flows through the unit. They are compact and wall-mounted, but they depend heavily on gas supply, pipe sizing and water pressure.
| Feature | Gas Storage | Instant Gas |
|---|---|---|
| Hot water method | Heats and stores water | Heats water as it flows |
| Tank | Yes | No |
| Space needed | Tank footprint | Compact wall-mounted unit |
| Best suited to | Like-for-like storage replacement | Compact continuous flow upgrade |
| Main check | Tank size and recovery | Gas pipe sizing and flow demand |
If you want to compare wall-mounted options, browse Instant Gas Hot Water Systems.
Gas Storage vs Heat Pump Hot Water
Heat pump hot water may be worth comparing if your goal is reducing long-term running costs or moving away from gas.
A gas storage system may be better if:
the property is already set up for gas storage
you want a familiar replacement
the budget is focused on upfront cost
you prefer tank-style gas hot water
the installation location already suits gas storage
A heat pump may be better if:
the home has rooftop solar
you want to reduce gas use
you have outdoor space and airflow
you want lower running cost potential
you are comfortable with fan and compressor noise
For broader alternatives, compare Heat Pump Hot Water Systems and the 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 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, valves, required extras and site requirements.
Before ordering supply only, make sure your licensed installer has confirmed the gas type, system size, connection positions, installation location, access, valve requirements and compliance needs.
Brisbane and Gold Coast Buying Context
For Brisbane and Gold Coast homes, gas storage hot water is still commonly chosen for like-for-like replacements, especially where the property already has natural gas or LPG.
Local homes should check:
whether the property uses natural gas or LPG
whether the existing system is 135L, 170L, 270L or another size
whether the old system supplied enough hot water
whether the installation location still suits a gas storage tank
whether valves need replacing
whether gas pipework is suitable
whether drainage and discharge points are suitable
whether access allows delivery and positioning
whether supplied-and-installed is available for the address
whether supply-only is preferred because a licensed installer is already arranged
A gas storage replacement can be straightforward, but the system still needs to match the home.
Common Gas Storage Hot Water Issues to Watch For
Common issues with gas storage systems include:
not enough hot water
slow recovery after heavy use
pilot light problems
gas supply issues
water leaking from valves
relief valve discharge
rust or corrosion around fittings
burner or thermostat issues
anode wear
hard water scale build-up
tank age and corrosion
incorrect gas type
system undersized for the household
Some issues are age-related. Others come from poor sizing, water quality, faulty valves or installation conditions.
Gas hot water repairs and installation should only be handled by licensed professionals.
Before Ordering Checklist
Before ordering a gas storage hot water system, check:
whether the property uses natural gas or LPG
whether the existing system size was enough
how many people live in the home
how many bathrooms are used daily
whether showers are short or long
whether the home regularly runs out of hot water
whether a compact or larger tank is needed
whether the system will fit the existing location
whether access is suitable
whether gas pipework is suitable
whether valves need replacing
whether drainage and discharge points are suitable
whether supply only or supplied and installed is required
whether your installer has confirmed suitability
This helps avoid ordering the wrong gas type, wrong size or wrong system for the home.
Which Gas Storage System Should You Choose?
Choose the Vulcan 4-Star 135L if you want a compact, value-focused gas storage replacement and the old 135L system already suited the home.
Choose the Rinnai Hotflo 130L/135L if you prefer Rinnai and the model is available in the correct gas type for your property.
Choose the Rheem Stellar 330 if you want the best overall performance option in this comparison and your home has higher hot water demand.
Choose the Aquamax G270SS if you want a premium stainless steel gas storage comparison and it is available for your property.
For most customers, the safest starting point is to compare the Gas Hot Water Systems, 130/135L Gas Hot Water Systems, Rheem Hot Water Systems, Rinnai Hot Water Systems, Vulcan Hot Water Systems and Aquamax Hot Water Systems categories before ordering.
Long-Tail FAQs
Is the Rheem Stellar 330 better than a Vulcan 135L?
The Rheem Stellar 330 is better for higher hot water demand, stronger recovery and larger households. The Vulcan 135L is better for compact like-for-like replacement where the old 135L system was already enough.
Is a Vulcan 135L gas hot water system enough for a family?
A Vulcan 135L may suit small to medium households with moderate usage. It may not suit larger families, long showers, multiple bathrooms or homes that already ran out of hot water with a similar-sized tank.
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 gas type must be confirmed before ordering.
Is Rinnai Hotflo better than Vulcan?
Rinnai Hotflo and Vulcan both sit in the compact gas storage comparison. Rinnai may suit customers who prefer the Rinnai brand, while Vulcan may suit customers wanting a currently listed value-focused option. The better choice depends on availability, gas type, price, warranty and site suitability.
Is Aquamax G270SS still worth considering?
Aquamax G270SS is worth considering as a premium gas storage comparison where available. Customers should check current product availability, warranty terms, gas type and whether the household genuinely needs a premium high-performance gas storage system.
Should I replace gas storage with instant gas?
Instant gas may be worth considering if you want a compact wall-mounted system and the property has suitable gas supply, pipe sizing and water pressure. Gas storage may be better if you want a familiar tank-style replacement.
Is heat pump hot water better than gas storage?
Heat pump hot water may have lower running cost potential in suitable homes, especially with rooftop solar. Gas storage may be better for customers wanting a simple like-for-like gas replacement. The right choice depends on budget, energy source, location and household demand.
Can I buy a gas storage hot water system supply only?
Yes. Supply only is suitable if you already have your own licensed installer arranged. The product price is for the unit only and does not include installation, valves, gas work, disposal, pipework changes or compliance upgrades unless selected separately.
Final Word
The Rheem Stellar 330 is the strongest overall performer in this comparison for households that need more hot water and want a higher-performance gas storage system.
The Vulcan 4-Star 135L is the best compact value option for small to medium homes and like-for-like replacements.
The Rinnai Hotflo 130L/135L is a good comparison point for customers who prefer Rinnai and want a compact gas storage system where available.
The Aquamax G270SS is the premium stainless steel comparison option where available and suitable.
The right choice comes down to household demand, gas type, installation location, tank size, budget and whether you want compact value or stronger long-term performance.
Browse the Vulcan 4-Star 135L Natural Gas Hot Water System, Vulcan 4-Star 135L LPG Gas Hot Water System, Rheem Stellar 330 Natural Gas Hot Water System, or compare the full Gas Hot Water Systems range before ordering.
