LARGE-CAPACITY ELECTRIC STORAGE
Vulcan 400L Electric Storage Hot Water System
The Vulcan 400L Electric Water Heater is a large mains-pressure electric storage system designed for households that need substantial stored hot-water capacity.
The current standard single-element 400L range is available as 661400G7 with a 3.6kW element and 661400G8 with a 4.8kW element. Both provide 400 litres of manufacturer-listed hot-water delivery and use left-hand plumbing connections.
Vulcan currently lists the 400L for up to nine people under its stated household-sizing assumptions. Actual suitability still depends on shower duration, fixture flow, bath use, climate, electricity availability and the household's daily hot-water pattern.
Installed Today can offer the Vulcan 400L as supply only or through eligible supplied-and-installed pathways in Brisbane and Gold Coast service areas, subject to product availability, access, plumbing, drainage, electrical supply and installation requirements.
Vulcan 400L at a glance: 400L hot-water delivery, single element, 3.6kW or 4.8kW model options, indoor or outdoor installation, off-peak tariff suitability, Rp 3/4 water connections, 111kg empty weight and a 10-year cylinder warranty for qualifying single-family domestic installations.
CURRENT MODELS
Which Vulcan 400L Models Are Current?
661400G7
Standard 400L single-element model with a 3.6kW heating element.
661400G8
Standard 400L single-element model with a 4.8kW heating element.
These are the standard Vulcan 400L electric storage products. They should not be confused with the separate 662400 twin-element range or the separate Vulcan Duomax range.
HOUSEHOLD SIZING
How Many People Does the Vulcan 400L Suit?
Vulcan currently publishes a maximum household guide of nine people for the standard 400L model under its stated shower, climate and electricity-supply assumptions.
A 400L system can be relevant for larger families, multi-occupant homes and properties where a smaller electric storage cylinder does not provide sufficient stored capacity.
Large Families
Substantial storage can suit homes where several people use hot water during concentrated morning or evening periods.
High Daily Demand
Baths, longer showers and multiple household occupants can increase the value of additional stored capacity.
Large Storage Replacement
The 400L is particularly relevant where an existing large electric storage heater is being replaced in a compatible position.
Vulcan's occupant number is a manufacturer sizing guide rather than a guaranteed capacity for every household.
KEY NUMBERS
Vulcan 400L at a Glance
400L
Hot-Water Delivery
3.6 / 4.8kW
Element Options
111kg
Empty Weight
10 Years
Domestic Cylinder Parts
TECHNICAL SPECIFICATIONS
Vulcan 400L Electric Water Heater Specifications
| Specification | 661400G7 | 661400G8 |
|---|---|---|
| Hot-Water Delivery | 400L | 400L |
| Element Arrangement | Single element | Single element |
| Element Rating | 3.6kW | 4.8kW |
| Installation | Indoor or outdoor | Indoor or outdoor |
| Tariff | Suitable for off-peak connection | Suitable for off-peak connection |
| Plumbing Orientation | Left-hand connections | Left-hand connections |
| Water Connections | Rp 3/4 | Rp 3/4 |
| TPR Valve Setting | 1000kPa | 1000kPa |
| ECV Setting | 850kPa where fitted | 850kPa where fitted |
| Maximum Mains Pressure With ECV | 680kPa | 680kPa |
| Maximum Mains Pressure Without ECV | 800kPa | 800kPa |
| Height | 1840mm | 1840mm |
| Width | 690mm | 690mm |
| Depth | 730mm | 730mm |
| Empty Weight | 111kg | 111kg |
| Shipped Weight | 118kg | 118kg |
SINGLE ELEMENT
Is the Standard Vulcan 400L Single Element?
Yes. Both current standard 661400 variants use a single heating element.
The 661400G7 uses a 3.6kW element and the 661400G8 uses a 4.8kW element.
The larger 4.8kW element has a higher electrical load and therefore needs an electrical circuit suitable for that specific model.
Do not assume an existing electric-water-heater circuit suits either element size. The replacement model and existing circuit must be checked before connection.
ELECTRICAL CONNECTION
How Is the Vulcan 400L Electrically Connected?
Vulcan's current installation manual specifies a 220–240V AC, 50Hz mains supply and permanent connection to the water heater.
The correct circuit, cable, isolation and protective-device arrangement must suit the selected 3.6kW or 4.8kW appliance and the electrical installation at the property.
Electrical alteration, circuit extension, new circuits or switchboard work are separate from a standard like-for-like plumbing installation where required.
Never energise the water heater before it has been completely filled with water. The manufacturer specifically requires the cylinder to be full before electrical power is switched on.
OFF-PEAK ELECTRICITY
Can the Vulcan 400L Run on an Off-Peak Tariff?
Yes. Vulcan lists the standard 400L as suitable for connection to an off-peak or controlled electricity supply.
The large tank can heat during the available controlled-tariff window and store that hot water for later household use.
Whether controlled supply is suitable depends on the available heating period, selected element size and household demand.
Third-party solar diverters require particular care. Vulcan's current warranty terms state that Rheem may reject a warranty claim where a third-party solar diverter is connected to the water heater.
INDOOR OR OUTDOOR
Can the Vulcan 400L Be Installed Inside or Outside?
Yes. Vulcan identifies the 400L standard electric model as suitable for indoor or outdoor installation when the location satisfies its installation requirements.
The cylinder must be installed vertically upright on a stable supporting base and remain accessible for maintenance and eventual replacement.
Indoor installations require particular attention to potential water damage, safe-tray requirements and drainage.
SAFE TRAY
When Is a Safe Tray Required?
Vulcan's current installation manual states that where leaking from the water heater could cause property damage, the unit must be installed in a suitable safe tray.
The tray also requires an appropriate drain arrangement.
This is especially relevant for indoor installations, cupboards, laundries and other positions where a future leak could damage floors, walls or surrounding property.
BASE & SUPPORT
What Base Does a 400L Water Heater Need?
The water heater must stand vertically on a stable supporting surface suitable for the complete operating load.
The 111kg empty weight is only part of the load. Once filled, the system also contains hundreds of kilograms of water.
Vulcan states that the corrosion-resistant base can sit directly on a suitable supporting surface.
The current manual also advises against placing the unit directly onto concrete that is less than approximately two months old and not fully cured unless a suitable moisture barrier is used.
ACCESS & HANDLING
How Large Is the Vulcan 400L?
The standard 400L measures approximately 1840mm high x 690mm wide x 730mm deep and weighs approximately 111kg empty.
This makes delivery access an important part of installation planning.
- Check gates and side access
- Check stairs and significant steps
- Check steep driveways
- Check doorway and cupboard dimensions
- Check the route for trolley access
- Confirm the final position allows servicing
- Confirm the old unit can also be removed safely
A 400L cylinder is a substantial appliance. Difficult access can require additional handling labour even where the plumbing replacement itself is straightforward.
WATER PRESSURE
What Water Pressure Limits Apply?
The 400L uses a 1000kPa temperature and pressure relief valve.
Where an expansion control valve is fitted, Vulcan specifies an 850kPa ECV.
| Cold-Water Arrangement | Maximum Mains Supply Pressure |
|---|---|
| With Expansion Control Valve | 680kPa |
| Without Expansion Control Valve | 800kPa |
Where incoming mains pressure exceeds the applicable limit, the manufacturer requires an approved pressure-limiting valve.
EXPANSION CONTROL
Does Every Vulcan 400L Need an Expansion Control Valve?
No. Vulcan's current manual notes that an expansion control valve is required in some locations and water conditions rather than stating that every installation uses one.
Where fitted, the ECV has a lower pressure rating than the TPR valve and normally discharges thermal expansion from the cold-water side during heating.
The final arrangement is determined by the licensed plumber for the property and applicable installation requirements.
RELIEF VALVE DRAINAGE
Does the Vulcan 400L Need Drainage?
Yes. The TPR valve and any fitted expansion control valve require suitable discharge lines.
Vulcan requires relief-valve drains to remain open to atmosphere and maintain a continuous fall toward the approved discharge point.
The safe tray, where required, has its own drainage arrangement and relief-valve drains must not simply discharge into the tray.
STORED WATER TEMPERATURE
How Hot Does the Vulcan 400L Store Water?
The current manufacturer manual states that the water heater can operate until the stored-water temperature reaches approximately 60°C to 70°C, depending on thermostat setting.
These temperatures are intentionally hotter than normal showering temperature and can cause serious scalding.
The completed plumbing installation therefore needs the appropriate temperature-control arrangement for fixtures where limited delivery temperature is required.
VITREOUS ENAMEL CYLINDER
How Is the Vulcan Cylinder Protected?
The water heater uses a vitreous-enamel-lined steel storage cylinder together with sacrificial anode protection.
Vulcan's warranty requirements include specific anode selection guidance based on the total dissolved solids in the water supply.
Water quality and correct anode selection therefore matter to long-term cylinder protection and warranty coverage.
MAINTENANCE
What Maintenance Does Vulcan Recommend?
Vulcan recommends both six-monthly minor maintenance and a professional major service every five years.
Every Six Months
The manufacturer recommends gently operating the easing lever on the TPR valve and on the expansion control valve where one is fitted, and checking the safe-tray drain where applicable.
Every Five Years
The major service includes replacing the TPR valve, inspecting the ECV where fitted, checking the anode, inspecting the heating unit and checking the water heater and connections.
The fifth-year major service is relevant to warranty. Vulcan's current warranty allows a claim to be rejected where the required service was not arranged and the fault would have been identified and rectified during that service.
WARRANTY
Vulcan 400L Warranty
For current 661 Series 250–400L models, Vulcan's detailed warranty provides:
| Period | Component | Coverage |
|---|---|---|
| Year 1 | All components | Repair or replacement of the faulty component, including labour, subject to warranty terms |
| Years 2–10 | Cylinder in a single-family domestic dwelling | Replacement cylinder supplied; installation and repair labour is the owner's responsibility |
| Years 2–3 | Cylinder where not installed in a single-family domestic dwelling | Replacement cylinder supplied; installation and repair labour is the owner's responsibility |
This is why Vulcan commonly promotes the standard model as having a 10-year cylinder warranty, while the detailed terms distinguish parts coverage from labour coverage.
Years 2–10 are not ten years of free cylinder replacement labour. For qualifying single-family domestic installations, the replacement cylinder is supplied during the extended period but installation and repair labour is the owner's responsibility.
STANDARD VS TWIN ELEMENT
Is This the Twin-Element Vulcan 400L?
No. This page is for the standard 661400 single-element range.
| Model Family | Element Arrangement | Current 400L Option |
|---|---|---|
| 661400 | Single element | 3.6kW or 4.8kW |
| 662400 | Twin element | Separate 400L twin-element product |
A twin-element model has a separate upper booster element and different electrical operation. Select the correct product rather than treating the two versions as interchangeable.
STANDARD VULCAN VS DUOMAX
Is This the Vulcan Duomax 400L?
No. This product is part of the standard Vulcan 661 Series.
Vulcan maintains separate documentation and product families for standard electric storage and Duomax electric storage.
If replacing an existing unit, confirm the actual model code and required connection arrangement rather than ordering solely by tank capacity.
400L VS 315L
What Is the Difference Between a Vulcan 315L and 400L?
The key difference is stored hot-water capacity.
The 400L provides more stored water for properties with higher daily demand, but it is also physically larger and heavier and requires more energy to reheat a completely cold tank.
A 315L system can be sufficient for many medium-to-large households, while the 400L is relevant where usage justifies the additional capacity.
Bigger is not automatically better. System sizing should reflect actual household demand and electricity availability rather than simply replacing a smaller system with the largest tank available.
ELECTRIC STORAGE VS HEAT PUMP
How Does the Vulcan 400L Compare With a Heat Pump?
The Vulcan 400L uses a resistive electric element to heat stored water.
An air-source heat pump uses a refrigeration cycle to transfer heat from surrounding air into stored water and can use less electrical energy under suitable conditions.
The Vulcan 400L can make sense where a straightforward large electric-storage replacement is preferred and the existing installation is already suited to this type of cylinder.
A heat pump has different considerations including airflow, condensate drainage, compressor noise, outdoor space and different recovery behaviour.
SUPPLY ONLY
Buy the Vulcan 400L Supply Only
Choose supply only where you already have appropriately licensed plumbing and electrical trades arranged.
The unit-only price does not automatically include:
- Plumbing installation
- Electrical connection or alteration
- Valve kit
- Temperature-control components
- Pressure-control components
- Additional pipework
- Drainage alterations
- Safe tray where required
- New base or support work
- Old-system disposal
- Difficult-access handling
SUPPLY & INSTALL
Vulcan 400L Supplied & Installed
Eligible Brisbane and Gold Coast customers can select a supplied-and-installed pathway where the property and existing services suit the selected 661400 model.
Plumbing Check
Water pressure, valves, temperature control, pipework and relief drainage need to suit the 400L replacement.
Electrical Check
The circuit and connection must suit the selected 3.6kW or 4.8kW element rather than simply matching the physical tank size.
Access & Position
The 111kg empty cylinder needs safe delivery access, a stable base and enough room for future service and replacement.
INSTALLATION AREAS
Vulcan 400L Installation in Brisbane & Gold Coast
Installed Today can provide supplied-and-installed options across eligible Brisbane and Gold Coast service areas where the product and required installation scope are available.
Brisbane
Gold Coast
Additional work can apply where the property requires new valves, electrical upgrades, a safe tray, drainage changes, extra plumbing, relocation, base work, difficult access or off-site disposal.
LARGE ELECTRIC STORAGE REPLACEMENT
Why Choose the Vulcan 400L?
The standard Vulcan 400L is a straightforward large-capacity electric storage water heater with a choice of 3.6kW or 4.8kW single-element configurations.
Its current manufacturer specifications include 400L hot-water delivery, indoor or outdoor installation, off-peak suitability, mains-pressure operation, Rp 3/4 connections and a 10-year domestic cylinder parts warranty.
It is particularly relevant where a compatible large electric storage heater is already installed and the property can accommodate the cylinder's substantial physical size and filled operating weight.
COMMON QUESTIONS
Questions About the Vulcan 400L Electric Water Heater
Is the Vulcan 400L Still a Current Product?
Yes. Vulcan currently lists the standard 400L within its active electric vitreous-enamel water-heater range.
What Are the Current Model Codes?
The standard single-element models are 661400G7 and 661400G8.
What Is the Difference Between G7 and G8?
The G7 model has a 3.6kW element and the G8 has a 4.8kW element.
Is It a 400L Tank?
Vulcan lists the model with 400 litres of hot-water delivery.
How Many People Does Vulcan List It For?
Vulcan currently gives a maximum guide of nine people under its stated sizing assumptions.
Is It Single Element?
Yes. The standard 661400G7 and 661400G8 products are single-element water heaters.
Is There a Twin-Element 400L?
Yes. Vulcan has a separate 662400 twin-element product. It is not the model described on this page.
Is This the Duomax?
No. This is the standard 661 Series Vulcan electric storage model.
Can It Be Installed Indoors?
Yes, where the installation meets the manufacturer's requirements, including safe-tray and drainage requirements where applicable.
Can It Be Installed Outdoors?
Yes. Vulcan identifies the water heater as suitable for indoor or outdoor installation.
What Are the Dimensions?
Approximately 1840mm high x 690mm wide x 730mm deep.
How Much Does It Weigh?
Approximately 111kg empty and 118kg shipped.
What Size Are the Water Connections?
The hot and cold connections are Rp 3/4.
Are the Connections Left-Handed?
Yes. Vulcan currently describes the standard 400L as using left-hand connections.
What Is the TPR Valve Setting?
1000kPa.
What Is the ECV Setting?
Where fitted, the expansion control valve setting is 850kPa.
What Is the Maximum Water Pressure With an ECV?
680kPa.
What Is the Maximum Water Pressure Without an ECV?
800kPa.
Is It Suitable for Off-Peak Electricity?
Yes. Vulcan lists the standard 400L as suitable for an off-peak electricity supply.
Can I Connect a Solar Diverter?
Check the manufacturer warranty position before doing so. Vulcan's current warranty states that Rheem may reject a warranty claim where a third-party solar diverter is connected to the water heater.
How Hot Does It Store Water?
The current owner manual states approximately 60°C to 70°C depending on thermostat setting.
Does It Need a Safe Tray Indoors?
Where leakage could cause property damage, Vulcan requires the water heater to be installed in a suitable safe tray with compliant drainage.
Does It Need Servicing?
Yes. Vulcan recommends minor valve maintenance every six months and a professional major service every five years.
What Is the Warranty?
Year 1 covers all components including labour. For a qualifying single-family domestic dwelling, the cylinder then receives replacement-parts coverage through years 2–10, with installation and repair labour payable by the owner during that extended period.
Is the Warranty the Same for Rental or Commercial-Type Installations?
Not necessarily. Where the unit is not installed in a single-family domestic dwelling, the current detailed warranty provides cylinder replacement-parts coverage only through years 2 and 3 after the initial one-year all-component period.
Can I Buy the Vulcan 400L Supply Only?
Yes. Supply-only ordering suits customers who already have appropriately licensed plumbing and electrical trades arranged.
Can Installed Today Install It?
Eligible Brisbane and Gold Coast properties can select a supplied-and-installed pathway where access, plumbing, drainage, electrical supply and the installation position are suitable.
FINAL CHECK
Is the Vulcan 400L Right for Your Home?
The Vulcan 661400 is primarily suited to homes requiring substantial electric storage capacity and enough installation space for a large 400L-class cylinder.
Current variants provide a choice of 3.6kW or 4.8kW single-element heating, with indoor or outdoor installation and off-peak electricity suitability.
Before ordering, check household demand, element size, existing electrical circuit, water pressure, valve condition, temperature control, relief drainage, access, support base and whether a safe tray is required.
For supply only, arrange appropriately licensed installation trades. For eligible Brisbane and Gold Coast properties, select the matching supplied-and-installed pathway and any required valve, electrical, drainage, base, disposal or difficult-access add-ons before checkout.
Tempering Valve and Element Information
*Element size information:
All electric hot water units are supplied as standard with a 3.6kW element unless otherwise stated on the product page, invoice, or order confirmation.
If a different element configuration is requested, such as 1.8kW or 2.4kW, the hot water unit may still arrive with the standard 3.6kW element fitted from the manufacturer. The requested 1.8kW or 2.4kW element will be supplied separately with the order for installation by a suitably licensed electrical contractor or licensed electrical licence holder.
Any element changeover, electrical connection, disconnection, wiring, testing, or modification must be carried out by a licensed electrical contractor or licensed electrical licence holder. Elements must not be changed, connected, modified, or tested by an unlicensed person.
Alternative elements supplied for non-standard configurations may be generic replacement elements and may not be the same brand as the hot water unit unless specifically stated. Generic elements are supplied to suit the requested element size and electrical configuration, but final suitability must be checked by the licensed installer before installation.
1.8kW and 2.4kW elements supplied separately with a hot water unit include a 12-month supply-only parts warranty from the date of purchase, provided the element has been correctly installed by a licensed electrical contractor or licensed electrical licence holder and used under normal operating conditions.
This element warranty covers the replacement supply of the element only. It does not include labour, call-out fees, electrical work, plumbing work, fault finding, removal, reinstallation, testing, travel, downtime, damage caused by incorrect installation, or any other associated costs. Warranty may be declined where the element has been incorrectly installed, dry-fired, modified, damaged, connected to incorrect voltage or wiring, affected by power issues, used in unsuitable water conditions, or installed by an unlicensed person.
Proof of purchase, installer details, electrical licence details, photos, and/or return of the faulty element may be required before a warranty claim is approved.
**Tempering valve information:
Where a hot water system is capable of delivering water above 50°C, a compliant tempering valve must be installed to control the temperature delivered to personal hygiene fixtures such as showers, baths, basins, and bathroom outlets. This helps reduce the risk of scalding and assists with meeting plumbing compliance requirements.
A tempering valve blends hot and cold water to deliver a safer controlled outlet temperature to required fixtures. The hot water unit itself may store water at a higher temperature, but the water delivered to personal hygiene outlets must be controlled where required by plumbing regulations.
If your property already has a suitable, compliant tempering valve installed, your licensed plumber can assess whether it is appropriate for use with the new hot water system. Existing valves may not always be suitable due to age, condition, compliance requirements, valve type, location, or system compatibility.
If a compliant tempering valve is not already installed, or if the existing valve is unsuitable, one must be supplied and installed by a licensed plumber as part of the hot water installation.
Tempering valves are not automatically included with every supply-only hot water unit unless specifically selected, listed as included, or purchased as part of a suitable valve kit. If a tempering valve is required, please purchase the appropriate valve kit with your order or arrange for your licensed installer to supply and install the correct tempering valve on site.
It is the customer’s responsibility to ensure the installation is completed by appropriately licensed trades and that all required valves, fittings, electrical work, plumbing work, and compliance requirements are allowed for as part of the installation.
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Where relevant, you can add common installation extras such as valve kits, bases, access-related items, removal, electrical options or other site-specific upgrades before checkout.
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It is a simpler way to organise the product, the selected extras and the parts of the job that matter most.
Important Installation Note
Installation availability, inclusions and add-ons vary by product type, service area, site access, existing services, selected options and property requirements.
Some jobs may require additional work, upgrades or checks before installation can proceed. Final suitability may need to be confirmed based on site conditions, plumbing, electrical requirements, valves, drainage, access and compliance requirements.
Supply-only orders do not include installation, old unit removal, disposal, valve kits, electrical work, plumbing alterations or compliance upgrades unless these are clearly selected or included in your order.
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Installed Today makes delivery simple, whether you are ordering supply-only or choosing an optional install package.
For supply-only orders, you can select from available delivery options at checkout. For eligible orders with installation selected, shipping is included and coordinated to align with your selected installation period where possible.
Delivery Options
Same Day Delivery
Same day delivery may be available for selected hot water systems in Brisbane and Gold Coast metro areas when ordered before 7:00am.
Availability depends on stock, courier capacity, delivery location, product type and safe transport conditions.
Express Delivery
Express delivery is available on selected products and locations, with an estimated delivery timeframe of 1–4 business days.
Standard Delivery
Standard delivery is available on selected products, with an estimated delivery timeframe of 2–8 business days.
Free Shipping with Installation
When you select an eligible installation package, delivery is included as part of the supplied and installed order.
Your product delivery will be organised to align with your selected installation period where possible, helping avoid separate courier timing, storage issues or delays between delivery and installation.
Fast Metro Delivery
Most hot water orders in metro areas are delivered quickly, with many arriving within 1 business day depending on stock, location, order time and courier availability.
Weather and Transport Delays
Hot water systems are large, heavy products and cannot always be transported safely during rain or unsafe handling conditions.
Delivery timeframes may be affected if wet weather impacts loading, unloading, transport access or safe delivery conditions.
Express Delivery Refund
If your express delivery order takes longer than the estimated 1–4 business day express timeframe, your order will move to the standard 2–8 business day delivery timeframe and your express shipping charge will be refunded automatically.
Order Tracking
We will send your delivery details once your order has been dispatched or scheduled.
For supplied and installed orders, delivery timing may be coordinated around your selected installation period rather than sent as a separate courier-only delivery.
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Not sure whether to choose supply-only delivery or an optional install package? Contact our team before ordering and we can help you understand the best option for your product, location and timing.
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