Vulcan Duomax 400L Electric Storage Hot Water System
The Vulcan Duomax 400L Electric Storage Hot Water System is available from Installed Today as a supply-only electric hot water unit or as a complete supply and install package in selected Brisbane and Gold Coast service areas, where available.
Choose the unit only if you already have a licensed plumber and electrician arranged, or check your supply and install package before checkout to confirm installation suitability, access, valve kit requirements, water pressure, electrical requirements, indoor or outdoor location and available installation timeframes.
The Vulcan Duomax 400L is a large electric storage hot water system designed for larger families and homes with higher daily hot water demand. With 400L hot water delivery, a 3.6 kW single element, vitreous enamel lined cylinder and indoor or outdoor installation suitability, it is a practical replacement option for homes upgrading or replacing a large electric hot water system.
About the Vulcan Duomax 400L Electric Water Heater
The Vulcan Duomax 400L is an electric storage hot water system that stores and heats water inside a vitreous enamel lined cylinder.
It is designed for larger households that need more stored hot water capacity than common 250L or 315L systems. The 400L size can suit homes with higher daily hot water use, multiple occupants, longer shower patterns, higher bath or laundry demand, or larger replacement requirements, depending on tariff setup, climate, shower flow rates and household usage.
This 3.6 kW model is commonly selected where a large electric storage unit is required and the property has suitable plumbing, electrical supply, access, water pressure and installation space.
Buy Vulcan Duomax 400L Supply Only
Buy the Vulcan Duomax 400L supply only if you already have a licensed plumber and electrician arranged for installation.
The product price is for the unit only. Installation, valve kits, old system removal, disposal, electrical work, pipework changes, pressure control, access changes, base or tray requirements and compliance upgrades are not included unless selected separately as add-ons or part of an available install package.
Common search terms this product suits include:
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Vulcan Duomax 400L Supplied and Installed in Brisbane & Gold Coast
The Vulcan Duomax 400L can be ordered with a supply and install option in selected Brisbane and Gold Coast service areas, where available.
The installed-from price is based on the product plus the selected standard installation option. Final pricing can vary depending on site conditions and any selected add-ons.
Extra work or add-ons may be required for:
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Valve kit replacement
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Old system removal
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Disposal
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Electrical work
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Circuit or isolator changes
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Pipework changes
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Water pressure control
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Base or tray requirements
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Restricted access
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Indoor drainage requirements
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Outdoor weather exposure requirements
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Relocation from the existing hot water position
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Non-compliant existing installation
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Team lift or delivery access requirements
Vulcan Duomax 400L Installation in Brisbane
Installed Today can help Brisbane customers order the Vulcan Duomax 400L as either a supply-only electric water heater or a supplied and installed package in selected service areas.
This model may suit Brisbane family homes replacing an older large electric storage hot water system, especially where the existing location already suits a 400L cylinder and the electrical supply is suitable for a 3.6 kW single element unit.
Before installation, the site should be checked for access, drainage, water pressure, electrical supply, valve condition, pipework, base condition, weather exposure, safe lifting access and compliance requirements.
Vulcan Duomax 400L Installation in Gold Coast
Gold Coast homeowners, landlords, renovators and property managers can order the Vulcan Duomax 400L for supply only or supply and install where available.
This system may suit larger coastal homes, family properties, rental homes and investment properties needing a large electric storage hot water replacement. Final installation suitability depends on the existing hot water location, plumbing, electrical supply, water pressure, access, base condition and whether any additional parts or labour are required.
Is the Vulcan Duomax 400L Right for Your Home?
This system may suit you if:
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You want a large 400L electric storage hot water system
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You are replacing an existing large electric water heater
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Your household has high hot water usage
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You want more stored capacity than a 315L electric system
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You want a single element electric water heater
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You want a vitreous enamel lined cylinder
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You want a system suitable for indoor or outdoor installation where compliant
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You have suitable access, water pressure, drainage and installation space
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You have a suitable electrical connection or can arrange electrical work
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You want the choice of supply only or supply and install
Extra work may be required if:
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The system is being moved to a new location
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Existing valves are old, missing or non-compliant
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Electrical upgrades are required
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The existing circuit does not suit the 3.6 kW element
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Drainage or safe tray requirements apply
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Water pressure control is required
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Pipework changes are required
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Access is restricted
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The old system needs removal or disposal
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The installation area does not suit the tank size, weight or service access
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A smaller system may be better suited to the household’s usage pattern
Key Features of the Vulcan Duomax 400L
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400L electric storage hot water system
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Vulcan Duomax style
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Manufacturer part number: 6D1400G7
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Vulcan product reference: 661400G7
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Tradelink product code: 309856
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3.6 kW single element
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Lead free model listing
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400L hot water delivery
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Suitable for larger families with high hot water demand
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Maximum listed people serviced: 9, based on stated usage conditions
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Vitreous enamel lined cylinder
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Suitable for internal and external installation where compliant
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Suitable for connection to off-peak tariff
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Rp 3/4 hot water connections
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850 kPa ECV setting
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680 kPa maximum water supply pressure with ECV
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800 kPa maximum water supply pressure without ECV
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1000 kPa relief valve pressure
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111 kg empty weight on Vulcan specification
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118 kg shipped weight on Vulcan specification
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Tradelink listing shows 112 kg weight and 120 kg approximate empty weight
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1840 mm high x 690 mm wide x 730 mm deep
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WaterMark approved
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10 year cylinder warranty and 12 months parts and labour listed in product specification, subject to current warranty terms
Quick Specs
Brand: Vulcan
Range: Duomax
Product: Vulcan Duomax 400L Electric Water Heater
Product Code: 661400G7
Manufacturer Part Number: 6D1400G7
Tradelink Product Code: 309856
System Type: Electric storage hot water
Fuel Type: Electric
Tank Volume / Hot Water Delivery: 400L
Recommended Household Size: Larger family homes, up to 9 people based on stated usage conditions
Installation Type: Internal or external where suitable
Element Type: Single element
Element Rating: 3.6 kW
Tariff Suitability: Suitable for connection to off-peak tariff
Cylinder Type: Vitreous enamel lined cylinder
Water Connections: Rp 3/4
ECV Setting: 850 kPa
Maximum Water Supply Pressure with ECV: 680 kPa
Maximum Water Supply Pressure without ECV: 800 kPa
Relief Valve Pressure: 1000 kPa
Dimensions: 1840 mm high x 690 mm wide x 730 mm deep
Tank Diameter / Width: 690 mm
Weight Empty: 111 kg listed by Vulcan
Weight Shipped: 118 kg listed by Vulcan
Trade Listing Weight: 112 kg weight and 120 kg approximate empty weight listed by Tradelink
Lead Free: Yes, based on trade listing
WaterMark: Yes
Warranty: 10 year cylinder warranty and 12 months parts and labour listed in product specification, subject to current warranty terms
Vitreous Enamel Lined Cylinder
The Vulcan Duomax 400L uses a vitreous enamel lined cylinder. This lining helps protect the inside of the cylinder and supports long-term electric storage hot water performance when the system is installed and maintained correctly.
Water quality, pressure control, correct valve selection and compliant installation all play an important role in the service life of any electric storage water heater.
Large 400L Storage Capacity
The 400L capacity makes this Vulcan Duomax model suitable for homes with high daily hot water demand.
It may suit larger families, rental properties, larger homes, properties with multiple occupants or households replacing an existing 400L electric storage unit. The right size still depends on shower length, shower flow rates, baths, laundry use, climate, tariff setup and household routines.
Single 3.6 kW Element
The Vulcan Duomax 400L model requested is the 3.6 kW single element version.
A 3.6 kW element can suit many replacement installations where the existing electrical setup is compatible. Electrical suitability must still be checked before installation. Electrical work, circuit changes, isolator upgrades or compliance upgrades are not included unless selected or arranged separately.
Off-Peak Tariff Suitability
The Vulcan 400L electric water heater is listed as suitable for connection to off-peak tariff.
This can suit large electric storage systems where the tank heats during off-peak electricity periods and stores hot water for later use. Tariff setup, recovery time and household usage should be checked before choosing the system.
Internal or External Installation
The Vulcan Duomax 400L is suitable for internal or external installation where the location meets the required plumbing, drainage, access, electrical and compliance requirements.
For indoor installations, safe tray, drainage, service access and leak protection requirements should be checked before installation.
For outdoor installation, the system location must be suitable for weather exposure, service access, plumbing connections, base support and electrical compliance.
Connection Layout
The Vulcan 400L product page refers to left handed connections, while the trade listing identifies system connections as dual handed.
Because product variants and supplier listings can differ, the supplied model’s connection layout should be checked before installation, especially for like-for-like replacement work where pipework alignment affects installation time and cost.
Water Pressure Requirements
The Vulcan Duomax 400L has an ECV setting of 850 kPa, maximum water supply pressure of 680 kPa with ECV, maximum water supply pressure of 800 kPa without ECV and relief valve pressure of 1000 kPa.
If incoming water pressure is too high, pressure control may be required. Valve requirements should be checked before installation, especially when replacing older units where existing valves may be worn, missing or non-compliant.
Lead Free Model Listing
The Tradelink listing identifies this model as a lead free Duomax 400L electric water heater.
Lead free product listings are becoming increasingly important in plumbing product selection. Final suitability should still be confirmed against the product supplied, local requirements and the installer’s compliance checks.
Larger Replacement Considerations
The Vulcan Duomax 400L is a large and heavy electric storage unit. The Vulcan specification lists an empty weight of 111 kg and shipped weight of 118 kg, while the trade listing shows 112 kg weight and 120 kg approximate empty weight.
Before installation, access should be checked carefully. Stairs, narrow side access, steep blocks, cupboard locations, raised platforms, tight laundry spaces and difficult delivery paths may affect installation requirements.
Vulcan Duomax 400L vs 315L Electric Storage
The Vulcan Duomax 400L offers more stored hot water capacity than a 315L electric storage unit.
A 315L system may suit many medium to large families, while the 400L model may be better for larger households, higher shower use, multiple occupants, homes with baths or properties that regularly run out of hot water with a smaller tank.
The right size depends on usage patterns, tariff setup and whether the household needs the extra stored capacity.
Vulcan Duomax 400L vs Heat Pump Hot Water
A Vulcan Duomax 400L electric storage system uses an electric element to heat stored water. A heat pump uses heat from the surrounding air to heat water more efficiently under suitable conditions.
The Vulcan Duomax 400L may suit customers wanting a straightforward large electric storage replacement. A heat pump may suit customers looking for an energy-efficient upgrade where the installation location has suitable airflow, drainage, electrical supply, noise considerations and available space.
Vulcan Duomax 400L vs Instant Electric Hot Water
The Vulcan Duomax 400L stores a large volume of hot water, while an instant electric system heats water as it flows through the unit.
A 400L storage system is generally better suited to whole-home high-demand hot water than most instant electric systems. Instant electric units may suit specific point-of-use applications but often require higher electrical capacity and may not suit larger whole-home family use.
Common Uses
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Large electric hot water system replacement
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400L electric storage replacement
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Larger family homes
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Homes with high hot water usage
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Properties with multiple occupants
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Rental properties
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Investment properties
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Renovation projects
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Properties replacing an existing 400L electric unit
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Homes suited to off-peak electric hot water
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Indoor installations with compliant drainage and access
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Outdoor installations with suitable base and weather exposure
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Supply-only orders where a licensed installer is already arranged
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Supply and install orders in selected Brisbane and Gold Coast areas
Suitability depends on household size, hot water usage, tariff setup, installation location, plumbing condition, electrical supply, water pressure, access, drainage and compliance requirements.
Why Order From Installed Today?
Installed Today makes it easier to order the Vulcan Duomax 400L as either a supply-only product or a supplied and installed package where available.
You can choose the unit only if you already have a licensed plumber and electrician arranged, or select an installation option in eligible Brisbane and Gold Coast service areas. Valve kits and installation add-ons can be selected online where required, helping you build a clearer product and installation pathway before checkout.
Benefits of ordering from Installed Today include:
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Supply-only or supply and install options
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Brisbane and Gold Coast service area support
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Installed-from pricing shown separately from the product price
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Compatibility checks before installation
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Product-specific information to help compare models
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Optional add-ons available where suitable
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Clear separation between unit price, installation and extras
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Suitable for customers with their own licensed installer
Frequently Asked Questions
Can I buy the Vulcan Duomax 400L supply only?
Yes. You can buy the Vulcan Duomax 400L as a supply-only unit if you already have a licensed plumber and electrician arranged.
Can I get the Vulcan Duomax 400L installed in Brisbane?
Yes, supply and install may be available in selected Brisbane service areas, depending on location, access, site conditions and installation availability.
Can I get the Vulcan Duomax 400L installed in Gold Coast?
Yes, supply and install may be available in selected Gold Coast service areas, subject to service coverage, site suitability and installation availability.
Is installation included in the product price?
No. The product price is for the unit only unless you select an installed option. Installation, valve kits, disposal, old system removal, electrical work, pipework changes and other extras are not included unless selected separately.
What size is the Vulcan Duomax 400L?
The Vulcan Duomax 400L has 400L hot water delivery.
How many people is the Vulcan Duomax 400L suitable for?
Vulcan lists the 400L model as suitable for a maximum of 9 people based on stated usage conditions. Real suitability depends on shower length, water temperature, climate, outlet flow rates, tariff setup and household usage patterns.
What is the element size?
This model has a 3.6 kW single element.
Is it single element or twin element?
This model is listed as a single element electric water heater.
Can it be installed indoors?
Yes, it can be installed indoors where the location meets access, drainage, plumbing, electrical and compliance requirements.
Can it be installed outdoors?
Yes, it can be installed outdoors where the location is suitable and compliant.
Is it suitable for off-peak tariff?
Yes. Vulcan lists the 400L model as suitable for connection to off-peak tariff.
What are the dimensions?
The listed dimensions are 1840 mm high x 690 mm wide x 730 mm deep.
What does it weigh?
Vulcan lists the empty weight as 111 kg and shipped weight as 118 kg. Tradelink lists 112 kg weight and 120 kg approximate empty weight.
What are the water connections?
The listed water connections are Rp 3/4.
What is the ECV setting?
The listed ECV setting is 850 kPa.
What is the maximum water supply pressure?
The listed maximum water supply pressure is 680 kPa with ECV and 800 kPa without ECV.
What is the relief valve pressure?
The listed relief valve pressure is 1000 kPa.
Is it lead free?
The Tradelink listing identifies this model as lead free.
What is the manufacturer part number?
The Tradelink listing shows the manufacturer part number as 6D1400G7.
What is the Vulcan product code?
The Vulcan product page lists product references 661400G7 and 661400G8. For the 3.6 kW model, use 661400G7.
What is the Tradelink product code?
The Tradelink product code is 309856.
Does it have dual handed connections?
The Tradelink listing identifies the system connections as dual handed, while the Vulcan product page refers to left handed connections. The supplied model should be checked before installation.
Is it suitable for replacing an old large electric water heater?
Yes, it may be suitable for like-for-like replacement of an older large electric storage water heater, provided the location, connections, electrical supply, water pressure and compliance requirements are suitable.
What warranty does it have?
The product specification shows a 10 year cylinder warranty and 12 months parts and labour, subject to current warranty terms. Warranty details should be checked before purchase because warranty terms can depend on model, installation and manufacturer conditions.
