Aquamax Electric HoAquamax 991 Series Review: Is This Electric Hot Water System Worth It?t Water System Review: A Stellar Choice for Your Home?

May 9, 2023

The Aquamax 991 Series is commonly compared by homeowners looking for a straightforward electric storage hot water system. It is often considered for like-for-like replacement jobs, rental properties, family homes, units, townhouses and customers who want a familiar stored hot water setup without changing to gas or heat pump hot water.

Electric storage hot water can be a practical choice because it is simple, widely used and often easier to replace than changing to a different system type. But the right Aquamax model depends on more than brand reputation. You need to check tank size, household demand, installation location, access, valves, electrical setup, water pressure, tariff options, warranty terms and whether you are ordering supply only or choosing a supplied-and-installed option where available.

This Aquamax 991 Series review explains where it can make sense, what to check before ordering, and when it may be worth comparing other Aquamax Hot Water Systems, Electric Hot Water Systems, Heat Pump Hot Water Systems and broader Hot Water Systems.

Quick answer: is the Aquamax 991 Series worth considering?

The Aquamax 991 Series can be worth considering if you want an electric storage hot water system and your home already has an electric storage setup.

It may suit:

Homes replacing an older electric storage tank
Units and townhouses
Small homes
Family homes where the correct tank size is selected
Rental properties
Renovations keeping electric storage hot water
Homes without natural gas or LPG
Customers wanting a simple stored hot water system
Customers with their own licensed installer arranged
Eligible Brisbane and Gold Coast customers where supplied-and-installed options are available

It may not be the best option if your main goal is the lowest possible running cost and your home is suitable for heat pump hot water.

What is the Aquamax 991 Series?

The Aquamax 991 Series is generally searched as an electric storage hot water system range. Electric storage systems heat water in a tank and keep it ready for household use.

This makes them different from instant gas, instant electric and heat pump systems.

An electric storage system may suit customers who want:

Stored hot water
A like-for-like electric replacement
Simple operation
Multiple tank size options
No gas connection
A familiar hot water setup
Off-peak or controlled-load operation where suitable
Supply-only ordering with their own licensed installer
Installed options where available in eligible areas

The most important choice is the tank size. An undersized electric storage system can run out of hot water, while an oversized system may cost more than needed.

Aquamax 991 Series pros

The Aquamax 991 Series can offer several practical advantages when correctly selected.

Potential benefits include:

Electric storage operation
Useful for like-for-like replacement
Multiple capacity options depending on model availability
Suitable for homes without gas
Can suit off-peak or controlled-load electricity where available
Familiar stored hot water setup
Practical for units, townhouses and rental properties
Can suit larger households when correctly sized
May be easier to replace than changing system type
Supply-only ordering available where you have your own licensed installer
Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast areas

The strongest use case is usually replacing an existing electric storage system with the right capacity in the same location.

Aquamax 991 Series cons

The Aquamax 991 Series is not automatically the best choice for every property.

Potential drawbacks include:

Standard electric storage can have higher running costs than heat pump hot water
The tank can run out if undersized
Recovery time matters after heavy use
Larger models need more space
Installation extras can affect the final cost
Electrical setup must suit the selected unit
Valves and pressure control may need upgrading
Water quality can affect storage tank life
Off-peak setups need correct sizing
It may not suit customers wanting to move to a more efficient heat pump option

Electric storage can be simple and practical, but it should not be chosen only because it is familiar.

Aquamax 991 Series sizes: why capacity matters

Electric storage hot water systems rely heavily on stored capacity. Once the tank is depleted, the household must wait for the system to reheat.

Before choosing an Aquamax 991 Series size, consider:

Number of people in the home
Number of bathrooms
Shower length
Back-to-back showers
Bath use
Laundry use
Dishwasher use
Morning and evening peak demand
Whether the old tank ran out
Whether off-peak electricity applies
Whether the household may grow in future

Replacing the old unit with the same size is not always the best decision. If the old system regularly ran out of hot water, the new system may need to be larger or a different hot water type.

Aquamax 25L, 50L and compact electric systems

Small electric storage systems may suit point-of-use applications, small dwellings or low-demand situations.

They may suit:

Small units
Granny flats
Sinks or small-use areas
Low hot water demand
Compact spaces
Limited-use applications

They may not suit:

Family bathrooms
Multiple showers
Bath use
High daily demand
Rental properties with uncertain occupancy

Small tanks can be convenient, but they are easy to undersize if used for whole-home hot water.

Aquamax 125L electric hot water systems

A 125L electric hot water system may suit smaller homes or low-use households.

It may suit:

One to two people
Small units
Granny flats
Compact homes
Low shower demand
Like-for-like electric replacement

It may not suit larger families, long showers, two-bathroom homes or homes where the previous tank ran out regularly.

Aquamax 160L electric hot water systems

A 160L electric hot water system may suit small to medium households that need more capacity than a compact tank.

It may suit:

Two to three people
Small family homes
Townhouses
Units with higher usage
Moderate shower demand

Before choosing 160L, check whether the household uses most hot water in one peak period. If demand is high, a larger tank may be more practical.

Aquamax 250L electric hot water systems

A 250L electric hot water system is commonly compared for family homes and rental properties.

It may suit:

Small to medium families
One to two bathroom homes
Regular daily shower use
Rental properties
Like-for-like electric storage replacement
Homes needing more stored capacity

A 250L system can be a practical middle-ground, but it still needs to match the household’s usage.

Aquamax 315L electric hot water systems

A 315L electric hot water system may suit larger households or homes where 250L may not be enough.

It may suit:

Larger families
Higher daily hot water use
Multiple occupants
Some two-bathroom homes
Rental properties with higher likely demand
Homes where a smaller tank struggled

Before ordering, check the dimensions, access, base condition and whether the location can handle a larger system.

Aquamax 400L electric hot water systems

A 400L electric hot water system may suit very high-demand homes.

It may suit:

Large families
Multiple bathrooms
High shower use
Bath use
Larger rental homes
Short-stay accommodation
Homes with heavy morning or evening demand

A larger tank may improve stored capacity, but it can also increase upfront cost, space requirements and energy use. It should be chosen only where the demand justifies it.

Aquamax 991 for small homes

The Aquamax 991 Series may suit smaller homes where a compact or moderate-size electric storage tank matches daily demand.

For small homes, check:

Number of occupants
Bathroom count
Shower habits
Available space
Existing tank size
Whether the old system kept up
Electricity tariff
Installation location
Total replacement cost

A smaller home does not always need a large tank, but it should still have enough capacity for peak use.

Aquamax 991 for family homes

Family homes need more careful sizing.

Before choosing an Aquamax electric storage system, check:

Number of people
Number of bathrooms
Shower length
Back-to-back shower use
Bath use
Dishwasher use
Laundry use
Morning peak demand
Evening peak demand
Whether off-peak electricity applies
Whether the old tank ran out

If the household has grown since the last system was installed, the old size may no longer be suitable.

Aquamax 991 for rental properties

Electric storage hot water can be a practical choice for rental properties because it is familiar and simple for tenants to use.

For rentals, consider:

Number of bedrooms
Number of bathrooms
Likely occupancy
Simple operation
Maintenance access
Warranty documentation
Replacement cost
Installation location
Whether tenants may use more hot water than expected
Whether the tank size suits future tenants

A rental property should be sized for likely tenant demand, not only the current occupant.

Aquamax 991 for Airbnb and short-stay homes

Short-stay properties need reliable hot water for maximum guest occupancy.

Before choosing an Aquamax electric storage system for Airbnb or short-stay accommodation, check:

Guest capacity
Number of showers
Back-to-back shower demand
Bath use
Laundry between bookings
Peak morning usage
Peak evening usage
Recovery time
Maintenance access
Guest simplicity

Hot water complaints can affect guest experience. Do not undersize the system to save upfront.

Aquamax 991 for renovations

A renovation is a good time to reassess hot water properly.

Before choosing an Aquamax 991 Series electric system for a renovation, confirm:

Final bathroom count
Fixture layout
Tank location
Electrical supply
Drainage
Access after renovation
Space around the system
Future household demand
Whether heat pump hot water would suit better
Whether the existing electric setup is still the best option

Do not leave hot water selection until after plumbing and electrical layouts are already locked in.

Aquamax 991 vs standard electric storage alternatives

The Aquamax 991 Series should be compared against other electric storage systems by more than brand name.

Compare:

Tank size
Product dimensions
Element rating
Connection positions
Warranty terms
Installation requirements
Off-peak suitability
Indoor or outdoor location
Price
Total installed cost where available
Household suitability

You can compare broader Electric Hot Water Systems online before choosing.

Aquamax 991 vs heat pump hot water

An Aquamax 991 electric storage system and a heat pump hot water system both use electricity, but they heat water differently.

Feature	Aquamax 991 electric storage	Heat pump hot water
Main heating method	Electric element	Heat pump technology
Upfront cost	Often lower	Usually higher
Running cost	Usually higher	Often lower in suitable conditions
Installation	Often simpler like-for-like	More site-specific
Outdoor airflow	Usually less critical	Very important
Noise	Generally quieter	Fan and compressor noise
Drainage	Standard discharge drainage	Condensate drainage needed
Best suited to	Simple electric replacement	Efficiency-focused electric upgrade

A heat pump may be worth comparing if the home has suitable outdoor space, airflow, condensate drainage and electrical setup.

Compare Heat Pump Hot Water Systems if long-term electricity use is a major priority.

Aquamax 991 vs gas hot water

Electric storage and gas hot water suit different homes.

Aquamax electric storage may suit:

Homes without gas
Units and townhouses
Like-for-like electric replacement
Off-peak electricity setups where suitable
Customers wanting a simple stored hot water system

Gas hot water may suit:

Homes already connected to natural gas or LPG
Customers wanting gas storage or instant gas
Homes with suitable gas pipe sizing
Properties where gas hot water is already installed

If the home does not already have gas, changing to gas can add cost and may not be practical.

Aquamax 991 vs instant electric hot water

Instant electric hot water systems are usually better suited to compact or point-of-use applications, depending on the product and electrical capacity.

Aquamax electric storage may suit:

Whole-home hot water
Family homes
Stored hot water demand
Homes replacing an electric tank

Instant electric may suit:

Small point-of-use applications
Compact fixtures
Limited-use areas
Specific installations where electrical capacity supports it

Compare Instant Electric Systems only where the application suits. Instant electric is not always a direct replacement for a whole-home storage tank.

Aquamax vs Rheem electric hot water

Aquamax and Rheem are both commonly compared by customers looking for electric storage hot water.

When comparing Aquamax with Rheem Hot Water Systems, check:

Tank size
Product dimensions
Warranty terms
Element rating
Connection positions
Installation location
Price
Household demand
Total replacement cost

Brand matters, but the right model and size matter more.

Aquamax vs Rinnai electric hot water

Aquamax and Rinnai Hot Water Systems may both be considered by customers replacing electric storage hot water.

Compare:

Tank size
Indoor or outdoor suitability
Warranty terms
Dimensions
Element rating
Installation location
Product price
Availability
Household suitability

If you are comparing electric storage systems, focus on the exact model and installation requirements.

Aquamax vs Dux electric hot water

Aquamax and Dux Hot Water Systems may both be considered for electric storage replacement.

Compare:

Capacity
Warranty terms
Cylinder type
Connection positions
Dimensions
Installation extras
Household demand
Price
Total replacement cost

A cheaper product is not always cheaper overall if extra site work is needed.

Aquamax vs Vulcan electric hot water

Vulcan Hot Water Systems may appeal to customers looking for value-focused hot water replacement options.

When comparing Aquamax with Vulcan, check:

Tank size
Product type
Warranty terms
Upfront cost
Installation requirements
Household demand
Availability
Total installed cost where available

The better option depends on what suits the property and budget.

Energy efficiency and off-peak electricity

Electric storage hot water running costs depend heavily on how and when the system heats.

Running costs may be affected by:

Tank size
Number of people
Shower habits
Electricity tariff
Off-peak or controlled-load availability
Timer setup
Solar electricity setup where relevant
Hot water temperature settings
Water quality
Maintenance
Whether the tank is correctly sized

Larger electric storage systems may suit off-peak or controlled-load tariffs where the home has the right metering setup. But if the tank is too small, the home may run out of hot water before the next heating cycle.

Can Aquamax 991 work with solar power?

Electric storage hot water can sometimes be timed to use rooftop solar electricity, depending on the electrical setup, tariff and timer strategy.

A solar-friendly setup may involve heating during the day when solar power is available.

However, this depends on:

Solar system size
Timer setup
Electricity tariff
Existing hot water circuit
Tank size
Household usage
Installer advice
Whether off-peak or daytime heating is preferred

Do not assume every electric storage system automatically uses solar power effectively. The setup needs to be planned.

Installation requirements

An Aquamax electric storage system should be installed by the right licensed professional.

Installation checks may include:

Existing system size
Existing energy source
Indoor or outdoor location
Access
Dimensions
Connection positions
Base or stand condition
Drainage
Relief valve discharge
Tempering valve requirements
Pressure limiting valve requirements
Electrical supply
Circuit suitability
Old unit removal
Disposal
Compliance upgrades

A simple like-for-like replacement in one home may be more complex in another.

Indoor installation considerations

Some electric storage systems may be installed indoors where the model and location suit.

Indoor installations need careful attention to:

Safe tray requirements
Drainage
Overflow discharge
Cupboard space
Access
Leak risk
Electrical safety
Future service access
Compliance requirements

A leaking indoor tank can cause major property damage, so drainage and safe discharge matter.

Outdoor installation considerations

Outdoor electric storage installations are common, but the location still needs to suit the product.

Check:

Weather exposure
Stable base
Access
Clearances
Pipework
Electrical connection
Drainage
Relief valve discharge
Protection from impact
Future replacement access

Do not assume the existing location is automatically suitable for the new unit.

Supply-only Aquamax 991 Series

Supply-only ordering can suit customers who already have their own licensed installer arranged.

Supply only may suit:

Homeowners managing their own installation
Builders
Renovators
Landlords
Property managers
Trade customers
Customers outside supplied-and-installed service areas

Supply-only product pricing generally does not include installation, valves, old unit removal, disposal, electrical work, plumbing changes, drainage work, access upgrades or compliance upgrades unless clearly selected or included.

Before ordering supply only, your licensed installer should confirm that the selected Aquamax system suits the property.

Supplied-and-installed Aquamax electric hot water

Supplied-and-installed options may be available on selected products in eligible Brisbane and Gold Coast service areas where shown.

This can suit customers who want the product and installation pathway arranged together.

Before ordering supplied and installed, check:

Service area eligibility
Existing system type
Installation inclusions
Valve requirements
Electrical work
Drainage
Old unit removal
Disposal
Pipework changes
Access
Base or slab condition
Compliance upgrades
Product suitability

Do not assume every possible site requirement is included. Check the product page and selected options carefully.

Warranty considerations

Before choosing an Aquamax 991 Series system, check the current warranty terms on the product page and manufacturer documentation.

Review:

Cylinder warranty
Parts warranty
Labour coverage
Installation requirements
Maintenance requirements
Water quality exclusions
Pressure requirements
Electrical requirements
Licensed installer requirements
Proof of purchase
Service process
What is and is not covered

Warranty coverage does not mean every issue is automatically covered. Incorrect installation, water quality, high pressure, missing maintenance or missing documentation can affect claims.

Maintenance considerations

Electric storage hot water systems need periodic checks.

Maintenance may include:

Relief valve operation
Tempering valve checks
Anode inspection or replacement where applicable
Leak checks
Electrical component checks by a qualified professional
Pipework inspection
Drain line checks
Water pressure checks
General system condition checks

Maintenance requirements depend on the model, water quality and manufacturer instructions.

Water quality and tank life

Water quality can affect storage hot water systems.

Potential water-related issues include:

Hard water scale
Sediment build-up
Aggressive water chemistry
Corrosion risk
Valve wear
Reduced component life

If the property uses bore water, tank water, hard town water or has visible sediment, ask your installer whether water quality needs to be considered before ordering.

Common mistake: choosing the same size when the old system ran out

If the old electric system regularly ran out of hot water, replacing it with the same size may repeat the problem.

Reassess:

Household size
Bathroom count
Shower length
Bath use
Peak demand
Off-peak heating
Future household changes

Replacement time is the best time to fix an undersizing problem.

Common mistake: oversizing without reason

A larger tank may provide more stored hot water, but it can also increase upfront cost and energy use.

Do not choose the largest tank unless the household demand justifies it.

Common mistake: ignoring off-peak timing

Off-peak electricity can help manage running costs, but only if the tank is large enough to get the household through the day.

If the tank runs out before reheating, the setup may not suit the household.

Common mistake: ignoring installation extras

The product price is not the full replacement cost.

Extra costs may include:

Valves
Old unit removal
Disposal
Electrical work
Pipework changes
Drainage
Access issues
Base work
Compliance upgrades

Compare the full replacement pathway, not only the unit price.

Common mistake: assuming electric storage is the cheapest long term

Electric storage can be affordable upfront, but it may not be the lowest running cost option.

If long-term energy use is a major concern, compare heat pump hot water before ordering.

Common mistake: ignoring electrical requirements

The new system must suit the electrical setup.

Check:

Circuit suitability
Element rating
Off-peak connection
Timer requirements
Switchboard capacity
Whether electrical work is needed

Electrical work should be completed by a licensed electrician where required.

Common mistake: DIY electric hot water installation

Hot water installation involves plumbing, electrical safety, pressure control and compliance.

DIY installation can create:

Water leaks
Electric shock risk
Scalding risk
Warranty issues
Insurance problems
Non-compliant plumbing
System failure
Property damage

Use the right licensed professional.

Final verdict: should you buy an Aquamax 991 Series electric hot water system?

The Aquamax 991 Series can be a practical electric storage hot water option for homes that already use electric storage and want a straightforward replacement.

It is best suited to customers who choose the correct tank size, have a suitable installation location, and understand the difference between supply-only pricing and supplied-and-installed options where available.

It may be less suitable for customers wanting the lowest possible running cost, homes with suitable heat pump locations, or households where the existing electric system was undersized and regularly ran out of hot water.

Before ordering, compare Aquamax Hot Water Systems, broader Electric Hot Water Systems, Heat Pump Hot Water Systems, and all Hot Water Systems.

The right system is not simply the cheapest tank or the biggest tank. It is the system that matches your household demand, installation location, electrical setup, water quality and long-term cost expectations.

Long-tail FAQs

Is the Aquamax 991 Series good?

The Aquamax 991 Series can be a good electric storage option for homes that want a like-for-like electric hot water replacement, provided the tank size and installation location suit the household.

What size Aquamax electric hot water system do I need?

The right size depends on the number of people, bathrooms, shower habits, bath use, laundry use, dishwasher use, peak demand and whether the system runs on off-peak electricity.

Is Aquamax 991 suitable for family homes?

Yes, it may suit family homes if the correct tank size is chosen. Larger households should check daily usage, back-to-back showers and whether the old system ran out.

Is Aquamax 991 suitable for rental properties?

It can suit rental properties because electric storage hot water is familiar and simple to use. Choose a tank size based on likely tenant occupancy, not only the current occupant.

Is Aquamax 991 better than heat pump hot water?

Not always. Aquamax electric storage may be simpler and cheaper upfront, while heat pump hot water can use less electricity in suitable conditions. The better option depends on the property.

Can Aquamax 991 use off-peak electricity?

Some larger electric storage systems may suit off-peak or controlled-load setups where the home has the right meter and tank size. Your installer or electrician should confirm suitability.

Can Aquamax 991 work with solar power?

Electric storage may be timed to use rooftop solar in some homes, depending on the electrical setup, tariff, timer and household usage pattern.

Is Aquamax better than Rheem electric hot water?

Aquamax and Rheem should be compared by tank size, warranty, dimensions, installation requirements, price and household suitability. Brand alone should not decide the purchase.

Is Aquamax better than Dux electric hot water?

Aquamax and Dux both offer hot water options. Compare exact models, capacities, warranty terms, connection positions, dimensions and total replacement cost.

Can I install an Aquamax electric hot water system myself?

No. Electric hot water installation should be completed by licensed professionals. Plumbing and electrical work can create safety, warranty, insurance and compliance issues if done incorrectly.

Back to News