400L Electric Hot Water Systems Australia
Our Top 3 400L Electric Hot Water Systems
Choose How You Want to Order
Not every hot water job is the same. Choose supply only if you already have an installer arranged, or select a supplied and installed option where available.
Supply Only
Best if you already have a licensed plumber, gas fitter or electrician arranged.
Your product price is for the hot water system only. Installation is not included unless shown or selected separately.
Valves, old unit removal, disposal, electrical work, pipework changes, gas work and compliance upgrades may be required depending on your installation.
Supplied & Installed
Best if you want the hot water system and installation organised together.
Select your preferred system, answer the installation questions on the product page and choose any required installation options before checkout.
Installation availability and final requirements depend on your location, access, product type, existing services and site conditions.
Not Sure What You Need?
Hot water systems vary by size, energy source, household demand and installation setup.
Compare the available hot water systems below or use the selection tools throughout the site to narrow down the right option for your home.
Consider household size, energy source, available space, hot water demand, running costs and installation requirements before choosing.
400L Electric Hot Water Systems for Brisbane, Gold Coast & Major Australian Metros
400L electric hot water systems are large-capacity storage water heaters designed for bigger households and properties with consistently high stored hot-water demand.
They are commonly considered for large families, share houses, high-occupancy rentals, multi-bathroom homes, larger properties and like-for-like replacement of an existing 400L electric tank.
Installed Today supplies 400L electric systems across supported mainland Australian markets, with supplied and installed options available on selected systems in eligible Brisbane and Gold Coast service areas.
What Is a 400L Electric Hot Water System?
Who Should Consider a 400L Electric Hot Water System?
Large Families
400L can provide the stored-water reserve needed by households with several occupants and concentrated morning or evening demand.
Multiple Bathrooms
Larger storage can be useful where several bathrooms contribute to stronger household hot-water demand.
Share Houses
High occupancy and repeated showers can justify a larger storage tank where smaller systems struggle during peak periods.
Large Rentals
Higher-capacity rentals can require more stored hot water to suit realistic tenant occupancy.
Heavy Peak Demand
A larger tank can provide additional reserve where several showers, baths and household uses occur close together.
Existing 400L Replacement
If the existing 400L tank has historically provided the correct amount of hot water, another 400L system is the logical starting point.
315L vs 400L Electric Hot Water
| Storage Size | Typical Position | Common Application | Main Question |
|---|---|---|---|
| 315L | Large household storage | Larger families and stronger everyday demand | Will 315L comfortably cover peak household use? |
| 400L | Very large residential storage | Large families, share houses and high-demand properties | Does the home genuinely require another 85L of storage? |
When Is 315L Not Enough?
Moving from 315L to 400L provides a substantial increase in stored hot-water capacity.
It can make sense where a correctly operating 315L system regularly runs low during normal peak use, household occupancy has increased, several showers occur close together or regular bath use creates higher demand.
If 315L already comfortably covers the household, moving to 400L may simply increase purchase cost, physical size and standing storage without providing a meaningful benefit.
How Many People Can a 400L Electric System Supply?
Current 400L manufacturer guidance typically places this capacity in the large-family or approximately 8+ person range, but the answer varies by model and usage assumptions.
Dux, for example, publishes a broader 5–9 person range depending on usage, while current Rheem guidance places its 400L around 8–9 people.
Household count should only be used as a starting point.
- Number of occupants
- Number of bathrooms
- Shower duration
- Shower flow rates
- Bath use
- Morning peak demand
- Evening peak demand
- Laundry hot-water use
- Heating tariff
- Element configuration
Dux, Rinnai, Rheem & Vulcan 400L Electric Systems
The current Installed Today collection contains 5 large electric-storage systems.
Current options include Dux 400L, Rinnai 400L, Rheem 400L, Vulcan 400L and Vulcan DuoMAX 400L.
All five sit within the large conventional electric-storage category, allowing customers to compare brand, warranty, tank construction, element configuration, dimensions and replacement suitability.
400L Single-Element vs Twin-Element Electric Hot Water
Single Element
Common for off-peak or controlled-load storage where the system heats during an available tariff period.
Twin Element
Selected 400L ranges offer twin-element models that can provide additional recovery capability where the electrical setup supports them.
Electrical Setup Matters
The correct element configuration depends on tariff, circuit capacity, household demand and the selected model.
Rheem 400L Electric Hot Water
Rheem's current 400L model is an Australian-made large-capacity electric storage system.
Current specifications list approximately 1840mm height × 690mm width, with single and twin element model options and a maximum 12-year cylinder warranty.
Rheem positions the system around 8–9 occupants under its stated usage assumptions.
Dux Proflo 400L Electric Hot Water
Dux Proflo 400L is another Australian-made large electric-storage option.
The current model is approximately 1705mm high × 705mm wide and is available in single and twin-element configurations.
Dux publishes suitability for approximately 5–9 people depending on usage, reinforcing why actual household behaviour matters more than a single occupant number.
Rinnai Hotflo 400L Electric Hot Water
Rinnai Hotflo is the large-capacity option within Rinnai's conventional electric-storage range.
The current product uses a vitreous-enamel-lined steel tank and is available with single or twin element configurations depending on the selected model.
It suits customers comparing large electric storage for family homes, rentals and replacement of older high-capacity tanks.
Vulcan and Vulcan DuoMAX 400L Electric Hot Water
Installed Today currently lists both standard Vulcan 400L and Vulcan DuoMAX 400L.
Current DuoMAX specifications list a 3.6kW single element, enamel-lined 400L cylinder and dimensions of approximately 1840mm high × 690mm wide × 730mm deep.
Vulcan positions the 400L class toward large households of up to around nine people under stated usage assumptions.
400L Tanks Need Significantly More Installation Space
Current 400L systems are roughly 690–705mm wide and approximately 1705–1840mm high, depending on model.
That makes them materially larger than compact 125L or 160L systems and often larger than common 250L storage.
Check width, height, depth, service clearance and the entire access path before ordering.
Access Matters More with a 400L Hot Water System
Large electric cylinders are heavy even before they contain water.
Current 400L models can weigh well over 100kg empty, depending on brand.
Tight side access, stairs, retaining walls, narrow gates, internal locations and raised platforms can materially change installation and removal requirements.
Do not assume a standard ground-level replacement price applies where the old tank cannot be safely removed or the new system cannot be delivered normally.
Check the Existing Base Before Installing a 400L Tank
A 400L cylinder becomes a very heavy installation once filled with water.
The existing installation base therefore needs to be stable, level, suitable for the appliance and in acceptable condition.
A deteriorated, undersized or unsuitable base should not automatically be reused simply because the previous system stood there.
400L Electric Storage and Off-Peak Tariffs
Large electric-storage systems are commonly paired with off-peak or controlled-load arrangements where the property and electricity tariff support them.
The large tank stores heated water for use between available heating periods.
This can work well for high-demand households, but the tank still needs sufficient stored capacity to cover the period before the next heating cycle.
When Can a Twin-Element 400L System Help?
Selected 400L ranges offer twin-element configurations for households needing additional daytime recovery or greater flexibility than a standard single-element arrangement.
A twin-element system does not automatically mean both elements operate together continuously.
The exact operation depends on the product, wiring arrangement, tariff and electrical setup, so model selection should be confirmed with appropriately licensed electrical trades.
Replacing an Existing 400L Electric Hot Water System
If the existing 400L system has reliably met household demand, another 400L tank is the strongest sizing starting point.
Different brands can have different heights, diameters, connection positions and electrical options, so 400L capacity alone does not guarantee a direct physical swap.
- Existing brand and model
- Current household demand
- Tank dimensions
- Access path
- Empty tank weight
- Connection positions
- Element configuration
- Electrical circuit
- Tariff arrangement
- Valve condition
- Drainage
- Existing base condition
Moving from 315L to 400L Electric Hot Water
Upsizing can make sense where household demand has outgrown a correctly functioning 315L system.
The additional capacity can provide more reserve during back-to-back showers, regular bath use and high-demand household periods.
The new tank can also be wider and heavier, so installation space, access, base condition and electrical configuration should be checked before ordering.
When Can You Downsize from 400L to 315L?
Downsizing can make sense where the household is now significantly smaller and the existing 400L tank stores far more water than the property needs.
Current peak demand matters more than simply looking at average daily water use.
If several showers still occur close together, a smaller tank may run out even if total household consumption has fallen.
400L Electric Storage vs Large Heat Pump Hot Water
400L Electric Storage
Provides large stored capacity using conventional resistance heating and can be the simplest like-for-like replacement.
Large Heat Pump
Uses heat-pump technology and can reduce hot-water electricity consumption where the property and household demand suit it.
Do Not Compare Litres Alone
Heat-pump recovery, tank capacity, climate, boost operation and household demand all affect whether a smaller heat-pump tank can replace a 400L electric system.
400L Electric Hot Water for Large Rentals and Share Houses
Large rentals and shared properties are strong applications for 400L electric storage where occupancy and peak demand justify the tank size.
Several unrelated occupants can have less predictable shower schedules than a typical family household, increasing the importance of stored capacity and recovery.
Size around realistic occupancy rather than choosing 400L solely as a precaution.
400L Electric Hot Water Systems Brisbane
Brisbane is a primary 400L electric hot-water installation market for Installed Today. Selected systems can be ordered with professional installation in eligible Brisbane, Logan, Ipswich, Moreton Bay and Redlands service areas.
Common Brisbane applications include large-family homes, share houses, high-occupancy rentals, multi-bathroom properties and like-for-like replacement of existing large electric tanks.
Final installation requirements depend on access, tank dimensions, base condition, electrical supply, tariff, valves, drainage, plumbing and site conditions.
400L Electric Hot Water Systems Gold Coast
Selected 400L electric hot water systems are also available supplied and installed across eligible Gold Coast service areas.
This large-capacity class can suit bigger households, shared properties, larger rentals and homes where a 315L tank no longer provides enough stored hot water.
Confirm access, base suitability, household demand and electrical setup before ordering.
Buy 400L Electric Hot Water Systems Across Major Australian Metros
Supply-only 400L systems are available for customers who already have appropriately licensed plumbing and electrical trades arranged across supported mainland Australian markets.
Our main 400L electric hot-water markets include Brisbane, Gold Coast, Sunshine Coast, Sydney, Melbourne, Perth and Adelaide, together with Townsville, Cairns, Toowoomba, Newcastle, Central Coast, Wollongong and Geelong.
Brisbane and Gold Coast remain the primary Installed Today installation markets. Customers elsewhere can choose supply only where delivery is available and arrange their own appropriately licensed installer.
Choose How You Want to Order
Supply Only
Choose supply only if you already have appropriately licensed plumbing and electrical trades arranged and simply need the 400L system supplied.
Installation, valves, old-unit removal, disposal, electrical work, drainage, pipework changes, base work and compliance upgrades are not included unless specifically shown.
Brisbane Installation
Selected 400L electric systems are available with installation in eligible Brisbane metro service areas.
Availability depends on product, access, tank handling, electrical setup, base condition and site requirements.
Gold Coast Installation
Selected 400L systems are also available supplied and installed in eligible Gold Coast areas.
Final requirements depend on the selected system and existing installation.
Choose 400L Because the Household Needs the Capacity
400L is a genuine high-capacity electric-storage category. It should be selected because household demand justifies the stored-water reserve, not simply because it is the largest conventional tank available.
Compare occupants, bathrooms, shower habits, bath use, peak demand, tariff, single or twin-element options, dimensions, weight, access, base condition, electrical requirements and replacement compatibility before ordering.
If an existing 400L system has consistently supplied the property well, another correctly selected 400L system remains the strongest replacement starting point.
400L Electric Hot Water System FAQs
Common questions about choosing, ordering and installing a 400L electric hot water system for large homes, high-demand households and heavy hot water use.
What is a 400L electric hot water system best suited for?
A 400L electric hot water system is best suited to large homes, high-demand households and properties with heavy daily hot water use. It is a large-capacity storage option for homes needing reliable hot water across multiple bathrooms, kitchens and laundries.
How many people does a 400L electric hot water system suit?
A 400L electric hot water system commonly suits around 5 or more people, depending on shower length, daily hot water use, water-saving fixtures, recovery time and household habits. It is often considered where smaller 250L or 315L systems may not provide enough capacity.
Is a 400L electric hot water system enough for a large family?
Yes, a 400L electric hot water system can suit many large families and higher-use homes. It may be a good option where there are multiple bathrooms, longer showers or several people using hot water close together, but sizing should still be checked against your household use.
Can I buy a 400L electric hot water system supply only?
Yes. Choose supply only if you already have a licensed plumber or electrician arranged. Supply-only pricing is for the hot water system only and does not include installation, valves, old unit removal, disposal, electrical work, pipework changes or compliance upgrades unless selected separately.
Can I order a 400L electric hot water system supplied and installed?
Yes. Supplied and installed options are available for selected 400L electric hot water systems in eligible Brisbane and Gold Coast service areas. Availability depends on your location, access, existing setup, electrical requirements and site conditions.
Can I replace my old 400L electric hot water system with another 400L unit?
In many cases, a like-for-like 400L replacement can be a practical option, but the new system still needs to suit the existing location, plumbing connections, electrical setup, available space, drainage and current compliance requirements.
Where can a 400L electric hot water system be installed?
A 400L electric storage system can be installed in a suitable indoor or outdoor location depending on the model, property setup and manufacturer requirements. The system must have safe access, compliant plumbing, suitable drainage, enough space and the correct electrical connection.
Does installation include electrical work?
Electrical work is not automatically included unless shown in the selected installation option or chosen as an add-on. Some replacements may require electrical checks, circuit changes, isolators, timers, tariff work or other upgrades by a licensed electrician.
Does installation include old system removal and disposal?
Old system removal and disposal are not automatically included unless shown in the selected installation option or chosen as an add-on. Access, location, mounting, stairs, tank size and site conditions can affect what is required.
Is a 400L electric hot water system instant?
No. Most 400L electric hot water systems are storage systems, not instant systems. They heat and store water inside a large tank so hot water is ready when needed. Recovery time depends on the element rating, power supply, tariff setup and how much hot water has been used.
Do you install 400L electric hot water systems in Brisbane and the Gold Coast?
Supplied and installed options are available in eligible Brisbane and Gold Coast service areas. Availability depends on the selected product, your address, access, existing system and installation requirements.