JR GAS & WATER INSTALLER ASSESSMENT
Our Electric Hot Water Installer Verdict
This is the part of the product page we consider most important. It is our assessment of the product from the installer's side: construction, installation, commissioning, service access and manufacturer support, rather than a repeat of the specification sheet.
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JR GAS & WATER LOCAL INSTALLATION
Local Hot Water Installation Areas
View all hot water service areas🏷️ Brand: Dux
🔢 Model Number: 400T1
📦 Volume: 400L
📏 Width: 705 mm
📐 Height: 1705 mm
🌍 Manufactured In: Australia
🛠️ Cylinder / Heat Exchange Material: Steel Enamel
🛡️ Cylinder / Heat Exchange Warranty: 10 Years
🔇 Noise Level: NA dBa
⚖️ Dry Weight: 115 kg
⚡ Energy Source: Electric
📡 WiFi Controller: No
⏲️ Built-In Timer: No
💡 LED/LCD Status Indicator: No
📊 Coefficient of Performance (COP): 1
DUX ELECTRIC HOT WATER INSTALLATION
Dux Proflo 400L Installation Brisbane & Gold Coast
JR Gas & Water supplies, replaces and professionally installs the Dux Proflo 400L electric hot water system across eligible Brisbane, Gold Coast and surrounding South East Queensland service areas.
The Dux Proflo 400L is a large-capacity mains-pressure electric storage water heater designed for homes with genuinely high hot water demand. The current range includes the 400T1 single-element and 400T2 twin-element configurations, giving customers different recovery and tariff options depending on the property and household.
Although sold as a 400L hot water system, Dux specifies a physical storage capacity of approximately 415 litres with a 400 litre hot-water delivery rating. It uses commercial-grade Y-class enamel, a larger sacrificial anode, a moisture-resistant polymer base and dual-sided plumbing connections.
Dux Proflo 400L at a glance: the Proflo 400L is a high-capacity Australian-made electric storage system available as 400T1 single element or 400T2 twin element. JR currently positions it around 7–8+ person household demand, while Dux publishes a broader 5–9 person guide. It is most relevant where a smaller 250L or 315L system does not provide enough stored hot water.
Dux Proflo 400L Supply & Installation at a Glance
Hot Water Delivery
400 litres rated hot-water delivery from a 415L physical storage cylinder.
JR Household Guide
Approximately 7–8+ people depending on household demand and configuration.
Element Options
3.6kW single element or 2 × 3.6kW twin element.
Installation Area
Eligible Brisbane, Gold Coast and surrounding South East Queensland service areas.
Who Is the Dux Proflo 400L Best For?
Very Large Households
The 400L format is designed for properties needing substantially more stored hot water than a typical 250L or 315L family system.
Heavy Peak Hot Water Demand
It can suit homes with several bathrooms, multiple showers used within the same peak period or other consistently heavy hot water demand.
Large Electric Storage Replacements
The Proflo 400L provides a straightforward replacement pathway where an existing high-capacity electric system remains the right technology for the property.
PRODUCT SUITABILITY
Is the Dux Proflo 400L Right for My Home?
A Good Choice If...
You have genuinely high hot water demand, already use a large electric storage system and have sufficient installation space, structural support and electrical capacity for a 400L-class cylinder.
Consider Another Option If...
A 315L system already comfortably covers the household, or your main priority is reducing water-heating electricity consumption through heat-pump, solar or another higher-efficiency technology.
JR Should Check First If...
You are changing from single to twin element, changing tariff, relocating the system, installing indoors or are unsure whether the existing circuit, base, valves, access and drainage are suitable.
How Many People Does the Dux Proflo 400L Suit?
JR currently positions the Dux 400L at approximately 7–8+ occupants for high-demand household applications.
Dux publishes a broader manufacturer guide of 5–9 people. That range should be treated as general guidance rather than a guarantee because actual hot water demand varies substantially between households.
Long showers, high-flow fixtures, baths, multiple bathrooms and simultaneous usage can increase hot water consumption dramatically. Likewise, a seven-person household with efficient fixtures and staggered showers may require less stored hot water than a smaller household with heavy usage.
JR recommends confirming that 400L is genuinely required rather than automatically replacing a previous 400L tank with the same size.
How Does the Dux Proflo 400L Work?
The Proflo 400L is a conventional electric storage water heater. Cold water enters the storage cylinder and is heated by an electric immersion element controlled by the thermostat.
Hot water remains stored inside the insulated cylinder until required at showers, taps and appliances. As hot water leaves the tank, incoming cold water replaces it and the electric element reheats the stored volume.
On the twin-element 400T2, an additional upper element provides approximately 80 litres of boost capacity. This allows a smaller upper portion of the tank to be reheated separately during periods of high demand, subject to the electrical and tariff configuration.
Because the Proflo uses resistance heating, electricity tariff, element arrangement and total household hot water consumption all influence running cost and recovery.
Key Features of the Dux Proflo 400L
400L Rated Delivery
High-capacity stored hot water designed for very large household and heavy-demand applications.
Commercial-Grade Enamel
Dux uses durable Y-class commercial-grade enamel inside the storage cylinder.
Larger Sacrificial Anode
Dux specifies an enlarged anode in the current 400L range to support tank protection and service life.
Polymer Base
The hard-wearing polymer base is designed to resist moisture and deterioration around the bottom of the storage cylinder.
Dual-Handed Plumbing
Water connections are provided on both sides of the tank to improve flexibility when matching existing pipework.
Single or Twin Element
Customers can select the standard 400T1 or higher-recovery 400T2 configuration depending on electrical and household requirements.
Dux Proflo 400L Specifications
| Brand | Dux |
|---|---|
| Range | Proflo Electric Storage |
| Single-Element Model | 400T1 |
| Twin-Element Model | 400T2 |
| Product Type | Mains-pressure electric storage hot water system |
| Physical Storage Capacity | 415L |
| Hot Water Delivery Rating | 400L |
| Dux Household Guide | 5–9 people |
| JR Household Guide | Approximately 7–8+ people |
| Single-Element Rating | 3.6kW |
| Twin-Element Rating | 2 × 3.6kW |
| Twin-Element Boost Capacity | 80L |
| Electrical Supply | 240V AC single phase |
| Overall Height | 1705mm |
| Tank Diameter | 705mm |
| Overall Diameter | 745mm |
| Cold Water Inlet Height | 220mm |
| Hot Water Outlet Height | 1445mm |
| Electrical Entry Height | 170mm |
| Empty Weight | Approximately 115kg |
| Relief Valve Pressure | 1000kPa |
| Maximum Inlet Pressure | 800kPa |
| Installation | Indoor or outdoor where compliant |
| Hard Water Option | Available |
| Country of Manufacture | Australia |
| Manufacturer Warranty | 10-year tank warranty; 1 year parts and labour, subject to Dux conditions |
The product is marketed as 400L because Dux rates hot-water delivery at 400L. The current technical brochure lists actual physical storage capacity as approximately 415L.
INSTALLATION REQUIREMENTS
What Is Required to Install the Dux Proflo 400L?
A 400L storage heater is physically large and extremely heavy once filled, so installation access and support are particularly important.
Stable and level installation base
Support suitable for a large filled storage cylinder
Access route large enough for the 745mm overall diameter
Cold-water supply connection
Hot-water outlet connection
Applicable pressure-control valves
Temperature-pressure relief discharge
Electrical circuit suitable for the chosen element configuration
Additional switching/circuit arrangement where twin element is selected
Suitable electricity tariff or control arrangement
Indoor drainage and safe-tray requirements where applicable
Safe ongoing service access
What's Included With Dux Proflo 400L Installation?
Standard Installation
Where the job qualifies as a suitable like-for-like replacement, the applicable JR package can include supply of the Dux Proflo 400L, removal of the existing heater where included, positioning of the replacement and connection to suitable existing plumbing and electrical services.
Compliance & Commissioning
The new water heater is connected, completely filled before energising, tested and commissioned for correct electrical heating, water delivery and safe valve operation.
Possible Additional Work
Electrical circuit changes, twin-element wiring, tariff changes, valve upgrades, additional pipework, drainage alterations, relocation or a new support base can increase the installation scope.
How Much Does Dux Proflo 400L Installation Cost?
Current supplied-and-installed pricing is shown in JR's live product and installation selector above. This keeps current product pricing, installation packages and availability inside the live Shopify system.
The final Dux Proflo 400L installation cost depends on whether the job is a straightforward external single-element replacement or requires twin-element electrical work, valve replacement, relocation, internal-installation protection, drainage changes or other plumbing alterations.
Because the tank is much larger and heavier than smaller residential systems, difficult access can also materially affect installation scope.
BRISBANE INSTALLATION
Dux Proflo 400L Installation Brisbane
JR Gas & Water supplies and installs the Dux Proflo 400L in Brisbane for suitable high-demand electric hot water replacements and new installations.
For Brisbane replacements, JR checks whether 400L is still required before simply installing the same size again. Household size, shower duration, bathrooms and usage may have changed since the original cylinder was installed.
The existing support base, access route, electrical circuit, tariff, valves and relief drain also need to suit a 400L-class replacement.
Eligible service coverage extends throughout Greater Brisbane and surrounding areas including Logan, Ipswich, Redlands and Moreton Bay.
GOLD COAST INSTALLATION
Dux Proflo 400L Installation Gold Coast
JR Gas & Water also supplies and installs the Dux Proflo 400L on the Gold Coast across eligible service areas.
The system can suit large family homes and properties with substantial peak hot water demand where a smaller 315L storage heater has proven insufficient.
Access should be checked before ordering. At approximately 745mm overall diameter and 115kg empty, a Proflo 400L may not pass through narrow side access, gates or internal doorways that accommodated a smaller previous cylinder.
JR can assess access, electrical configuration, plumbing and installation position before the final package is selected.
Can the Dux Proflo 400L Replace My Existing Hot Water System?
Replacing Another 400L Electric System
This is generally the most straightforward pathway where access, base, valves, drainage and electrical services remain suitable.
Replacing a 315L System
Moving to 400L can provide greater reserve capacity but should only be done where household demand genuinely justifies the larger storage volume.
Downsizing From 400L
If household demand has reduced, a 315L system may now be sufficient and can avoid storing more hot water than the property regularly needs.
Replacing Another Brand
The Dux can replace many comparable large electric storage systems, but cylinder diameter, height, plumbing connections and electrical configuration need to be checked.
Changing From Gas
A gas-to-electric conversion requires assessment of electrical capacity, plumbing and the redundant gas service rather than being treated as a normal tank replacement.
Relocating the Cylinder
Relocation can require new hot and cold pipework, cabling, relief drainage and structural support and should be assessed separately.
Single Element or Twin Element Dux Proflo 400L?
400T1 Single Element
The standard 400T1 uses a 3.6kW electric element. It provides conventional full-cylinder electric storage heating and can suit properties where the normal tariff and recovery arrangement are appropriate.
400T2 Twin Element
The 400T2 uses two 3.6kW elements and provides an approximately 80L boost volume. This can provide extra recovery flexibility during periods of high demand.
The correct configuration depends on household demand, tariff and the property's electrical setup. A twin-element installation can require different wiring and switching and should not be treated as the same electrical job as a single-element replacement.
How Efficient Is the Dux Proflo 400L?
The Proflo 400L is a conventional electric-resistance storage water heater. It converts electricity directly into heat rather than using ambient heat through a refrigeration cycle.
Running cost therefore depends on the amount of hot water used, the electricity tariff, single- or twin-element configuration and when the tank is permitted to reheat.
Correct sizing matters particularly at 400L. Installing more storage than the household actually needs can mean maintaining a larger volume of heated water unnecessarily.
For customers primarily focused on reducing water-heating electricity consumption, a large heat pump or another higher-efficiency technology may also be worth comparing before choosing conventional 400L electric storage.
Dux Proflo 400L vs Other Hot Water Sizes
| Option | Typical Application | Main Difference |
|---|---|---|
| 250L Electric Storage | Medium household demand | Substantially smaller storage reserve |
| 315L Electric Storage | Medium to larger households | Often sufficient where 400L would be excessive |
| Dux Proflo 400L | Very large household or heavy peak hot water demand | Maximum conventional Proflo residential storage capacity |
| Large Heat Pump | High-demand homes prioritising lower heating-energy consumption | Uses ambient-air heat rather than direct electric resistance as the primary heating source |
COMMON QUESTIONS
Dux Proflo 400L Installation FAQs
How much does Dux Proflo 400L installation cost?
Use JR's live product and installation selector for current supplied-and-installed pricing. Final cost depends on access, plumbing, electrical configuration, valves, tariff, drainage and whether the job qualifies as a standard like-for-like replacement.
Can JR Gas & Water install the Dux Proflo 400L in Brisbane?
Yes. JR supplies and installs suitable Dux electric storage systems across eligible Greater Brisbane and surrounding South East Queensland areas.
Can JR install the Dux Proflo 400L on the Gold Coast?
Yes. Professional Dux Proflo 400L installation is available across eligible Gold Coast service areas.
How many people does the Dux Proflo 400L suit?
JR currently positions its Dux 400L around 7–8+ people. Dux publishes a broader manufacturer guide of 5–9 people. Actual suitability depends on household hot water usage.
Is the tank exactly 400 litres?
Dux specifies approximately 415L physical storage capacity with a 400L hot-water delivery rating. The system is marketed as the Proflo 400L.
What are the Dux Proflo 400L model numbers?
The current single-element model is 400T1, while the twin-element model is 400T2.
What element size does the Dux Proflo 400L use?
The 400T1 uses a 3.6kW element. The 400T2 uses 2 × 3.6kW elements.
What is the twin-element boost capacity?
Dux publishes approximately 80L boost capacity for the 400T2 twin-element model.
What are the Dux Proflo 400L dimensions?
The current Dux brochure lists approximately 1705mm overall height, 705mm tank diameter and 745mm overall diameter.
How heavy is the Dux Proflo 400L?
Dux publishes an empty weight of approximately 115kg. Once filled, the installation carries well over 500kg of combined water and cylinder mass, so the support base must be suitable.
Can the Dux Proflo 400L be installed indoors?
Yes. Dux lists the Proflo for indoor or outdoor installation where all applicable access, drainage, safe-tray, structural and servicing requirements are met.
Does the Dux Proflo 400L use an anode?
Yes. Dux uses a sacrificial anode to help protect the enamel-lined cylinder and currently promotes a larger anode on its 400L models. A separate hard-water anode option is also available.
What warranty does the Dux Proflo 400L have?
Dux currently publishes a 10-year tank warranty and 1-year parts and labour warranty, subject to its full warranty conditions.
What is included with a standard installation?
The selected JR package can include supply, installation in a suitable existing location, connection to compliant services, testing and commissioning. Electrical, valve, drainage, access or relocation work outside the standard package may cost extra.
Dux Proflo 400L Warranty and Maintenance
Tank Warranty
Dux currently provides a 10-year tank warranty for the Proflo 400L, subject to the full manufacturer warranty conditions.
Parts & Labour
Dux currently lists 1 year parts and labour coverage outside the longer tank warranty.
Anode Maintenance
The Proflo uses a sacrificial anode as part of the cylinder-protection system. Dux publishes replacement-anode information for the 400T1 and 400T2 models, including a separate hard-water option.
Dux's manufacturer warranty is separate from any applicable JR Gas & Water Lifetime Warranty or workmanship coverage attached to the selected installation package.
Why Choose JR Gas & Water for Dux Proflo 400L Installation?
JR Gas & Water currently lists the Dux 400L as a professionally supplied-and-installed, Lifetime Warranty eligible product for South East Queensland.
With a 400L system, correct sizing and access are particularly important. JR considers household demand, tank dimensions, element configuration, tariff, electrical circuit, valves, drainage, structural support and replacement access before the final installation scope is confirmed.
This helps avoid installing the largest available tank simply because the old system happened to be 400L.
COMPARE YOUR OPTIONS
Compare Dux & Electric Hot Water Systems
Hot Water Systems
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Dux Hot Water Systems
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READY TO INSTALL
Install the Dux Proflo 400L With JR Gas & Water
The Dux Proflo 400T1 and 400T2 provide a high-capacity conventional electric storage solution for properties with genuinely heavy hot water demand. The range combines commercial-grade enamel, a larger sacrificial anode, polymer base, dual-handed connections and the choice between standard single-element and higher-recovery twin-element configurations.
JR Gas & Water supplies and installs suitable Dux Proflo 400L systems across eligible Brisbane and Gold Coast areas. Choose the applicable installation package and preferred date above, or use JR's quote pathway where the job involves difficult access, twin-element electrical work, relocation, internal-installation complexity or other non-standard requirements.
Your electric storage hot water system is built to provide years of reliable hot water, but like any major household appliance, it requires regular maintenance to remain safe, efficient and covered under the manufacturer's warranty.
Many manufacturers specify routine maintenance throughout the life of the system. Following these recommendations helps maximise the lifespan of the unit, maintain safe operation and reduce the likelihood of unexpected breakdowns.
Homeowner Maintenance – Every 6 Months
Every six months, homeowners should carefully operate the Pressure & Temperature Relief (PTR) Valve and Expansion Control Valve (ECV) (where fitted).
This simple maintenance helps:
- Confirm the safety valves are operating correctly.
- Flush away mineral deposits that can cause the valves to seize.
- Prevent excessive pressure from building inside the tank.
- Extend the life of the safety valves.
Why is this important?
Over time, minerals naturally found in water can build up inside the valves. If they are never operated, they may become stuck or fail when they're needed most.
A seized PTR or ECV valve can lead to:
- Excessive pressure inside the tank.
- Continuous leaking from the valve.
- Reduced system efficiency.
- Premature component failure.
- Potential safety risks.
Important: Always follow your manufacturer's instructions when operating the valves, as hot water will discharge during testing. If you're unsure or unable to perform this maintenance safely, contact a licensed plumber.
JR 6-Month Hot Water Health Check
Recommended Service – $99
While homeowner maintenance is important, a professional inspection provides additional peace of mind and can identify issues long before they become expensive repairs.
Our JR 6-Month Hot Water Health Check includes:
- Inspection for water leaks and corrosion.
- Testing of the PTR valve.
- Testing of the ECV (where fitted).
- Checking electrical operation.
- Inspecting wiring and electrical connections.
- Checking thermostat operation.
- Inspecting the element for signs of failure (where possible).
- Inspecting insulation and pipework.
- Checking for unusual noises or signs of sediment build-up.
- Confirming correct operation and water heating performance.
- Identifying any components showing signs of wear.
Service Price: $99
Regular inspections help detect small problems early, reducing the likelihood of unexpected breakdowns and helping maximise the life of your hot water system.
Recommended 5-Year Major Service
Current Price: $449
Most electric storage hot water manufacturers recommend replacing several key components approximately every five years to maintain reliable operation and protect the storage tank.
Our comprehensive 5-Year Service includes:
- Replacement of the sacrificial anode.
- Replacement of the Pressure & Temperature Relief (PTR) Valve.
- Replacement of the Expansion Control Valve (ECV).
- Full inspection of the hot water system.
- Electrical safety and operational testing.
- Inspection of pipework, valves and fittings.
- Leak and corrosion inspection.
- System performance testing.
Why These Components Matter
Sacrificial Anode
The sacrificial anode protects the steel tank from internal corrosion.
Instead of the tank rusting, the anode slowly corrodes over time. Once it has been consumed, the tank itself begins to rust from the inside, often leading to leaks and complete tank failure.
Replacing the anode is one of the most effective ways to extend the life of a storage hot water system.
Pressure & Temperature Relief (PTR) Valve
The PTR valve is one of the most important safety devices on your hot water system.
It automatically releases water if pressure or temperature inside the tank becomes too high, protecting both the system and your home.
Over time, scale and mineral deposits can prevent the valve from operating correctly, making regular testing and replacement essential.
Expansion Control Valve (ECV)
The ECV manages pressure created as water expands during heating.
A correctly functioning ECV:
- Reduces stress on the storage tank.
- Protects plumbing components.
- Helps extend the life of the hot water system.
- Reduces unnecessary water discharge through the PTR valve.
If Your Hot Water System Isn't Working
Before arranging a service, there are a few simple checks you can perform:
- Ensure the power is switched on at the electrical switchboard.
- Check whether the hot water circuit breaker or safety switch (RCD) has tripped.
- Confirm the isolation switch near the hot water system is turned on.
- Check whether your electricity supplier has scheduled an off-peak interruption.
- Look for obvious water leaks around the system.
- Check whether water is continuously flowing from the PTR or ECV valve.
- Listen for unusual noises such as excessive boiling, rumbling or banging.
- Confirm the system has had sufficient time to reheat after heavy water usage.
If your system still isn't producing hot water, contact JR Gas & Water for professional diagnosis and repair.
General Signs Your System May Need Attention
Arrange a service if you notice:
- Water leaking from the tank.
- Constant dripping from relief valves.
- Rust-coloured or dirty hot water.
- Reduced hot water capacity.
- Water taking much longer to heat.
- Unusual noises during heating.
- Visible corrosion.
- Fluctuating water temperature.
- Repeated electrical trips.
Early repairs are often significantly less expensive than replacing a failed hot water system.
Protect Your Warranty & Maximise System Life
Regular maintenance not only helps keep your hot water system operating safely and efficiently—it can also assist in meeting manufacturer maintenance requirements.
Ignoring recommended servicing may result in:
- Premature tank corrosion.
- Seized or leaking safety valves.
- Reduced efficiency and higher running costs.
- Unexpected loss of hot water.
- Avoidable repair costs.
- Shortened system lifespan.
- Possible reduction or loss of manufacturer warranty, depending on the manufacturer's maintenance requirements.
A small investment in preventative maintenance can add years to the life of your hot water system and help avoid the inconvenience and expense of an unexpected replacement.
ZipPay – 6-Month Interest-Free on All Products
ZipPay allows you to buy now and pay later, offering flexible, interest-free payments for up to 6 months on all JR products. It’s easy to set up, and you can customize your repayment schedule to suit your budget. Payments can be made weekly, fortnightly, or monthly, with a $6 fee if the balance isn’t paid off by the due date.
Humm – Up to 12 Months Interest-Free
Humm provides interest-free payment plans on purchases up to $30,000, perfect for both small and large buys. For items over $2,000, you can spread payments over 12 months. Humm also offers flexibility in scheduling payments based on when you get paid
Afterpay – 8 Weeks, No Interest
With Afterpay, spread the cost of purchases across four equal installments, due every two weeks, over an 8-week period. There’s no interest, and as long as payments are made on time, there are no fees. Perfect for purchases between $100 and $1,500
Plenti Finance – For Reclaim Systems Only
Plenti Finance is available exclusively for Reclaim Energy systems. This option offers tailored repayment terms with competitive interest rates, helping make eco-friendly choices more affordable. For more detailed information on Plenti’s terms and eligibility for Reclaim systems, visit the Reclaim Energy finance page
If you're in Queensland and considering a new electric hot water system, JR Gas & Water is the company to choose. Here's why:
Experience and Expertise: JR Gas & Water has over 10 years of experience in the gas and plumbing industry. Their team of licensed and insured professionals is highly skilled and knowledgeable about all aspects of electric hot water system installation, maintenance, and repair. They can provide expert advice on the best system for your needs and ensure a smooth installation process.
Quality Products: JR Gas & Water uses only high-quality products from trusted brands to ensure your electric hot water system is reliable and efficient. They also offer a range of options to suit different budgets and requirements.
Competitive Pricing: JR Gas & Water offers competitive pricing for their electric hot water systems, ensuring that you get a great value for your investment. They also provide a detailed quote upfront, so there are no surprises or hidden costs.
Customer Service: JR Gas & Water is committed to providing excellent customer service. They are always available to answer any questions or concerns you may have and are committed to ensuring your satisfaction.
Local Business: JR Gas & Water is a locally owned and operated business in Queensland. By choosing them for your electric hot water installation, you are supporting a local business and contributing to the local economy.
Warranty and Guarantee: JR Gas & Water provides a warranty and guarantee on all their products and services, giving you peace of mind knowing that your system is covered in case of any issues.
Energy Efficiency: Electric hot water systems can be energy efficient, and JR Gas & Water can help you choose the right system for your needs. They can provide advice on energy-saving features and options, such as timers and thermostats, to help you save on your energy bills.
Safety: JR Gas & Water is committed to safety and ensuring that all installations are done to the highest safety standards. They are also familiar with local safety regulations and requirements, ensuring that your electric hot water system is installed safely and in compliance with all relevant codes.
JR Gas & Water is a reliable and experienced choice for your electric hot water system installation in Queensland. With a commitment to quality products, competitive pricing, excellent customer service, and safety, they can help you make the switch to a more efficient and cost-effective solution for your hot water needs. Contact them today to learn more about their services and how they can help you.