🏷️ Brand – Thermann
🔢 Model Number – 9057811
📦 Volume – 400L
📏 Width – 705mm
📐 Height – 1705mm
🌍 Manufactured In – Australia
🛠️ Cylinder / Heat Exchange Material – Steel
🛡️ Cylinder / Heat-Exchange Warranty – 10 Years
🔇 Noise Level – NA dBa
⚖️Dry Weight – kg
⚡ Energy Source – Electric📡 WiFi Controller Built-in or Compatible –
⏲️ Built-In Timer – No
💡 LED/LCD Status Indicator –
📊 Coefficient of Performance (COP) –

Thermann 400L Large Electric Storage Installation in Brisbane & Gold Coast

The Thermann 400L Large Electric Storage is a large-capacity electric storage hot water system designed for homes wanting a straightforward, high-volume hot water solution. It is a strong option for buyers comparing Thermann 400L Large Electric Storage installed pricing, Thermann 400L Large Electric Storage supply and install, or hot water replacement in Brisbane. Like any large electric storage hot water system, the right result depends not just on the unit itself, but on whether the installation suits the property, electrical setup, available space, plumbing layout, and actual hot water demand.

What Is the Thermann 400L Large Electric Storage?

The Thermann 400L Large Electric Storage is an electric storage hot water system with 400 litres of hot water delivery and around 415 litres of storage capacity. It is designed as a practical electric storage option for homes wanting reliable day-to-day hot water in a familiar tank-style format.

This model is part of the Thermann large electric storage range and uses a dual-handed water connection layout, which can make changeovers easier in many replacement situations. It is also Australian made and built for simple installation where a like-for-like electric replacement is the right fit.

Why Choose the Thermann 400L Large Electric Storage?

One of the main reasons people choose the Thermann 400L Large Electric Storage is because it offers a large amount of stored hot water in a simple electric tank format. It is generally better suited to higher demand than the smaller 125L, 160L, 250L, and 315L models, making it a strong option for larger households or heavier daily hot water use.

This model also suits buyers wanting a straightforward electric storage replacement rather than moving to a different system type. It keeps the same electric footprint style as a like-for-like replacement, is one of the more affordable unit types to purchase, and can suit lower tariff arrangements where off-peak heating is preferred. Hard water element options are also available.

Is the Thermann 400L Large Electric Storage Right for Your Home?

The Thermann 400L Large Electric Storage is generally best suited to homes or properties with high hot water demand. It is rated for around 5 to 9 people on continuous tariff and around 4 to 6 people on off-peak, depending on usage patterns.

Because this is an electric storage hot water system, installation suitability depends on more than just tank size. The electrical arrangement, available installation space, water pressure conditions, valve setup, and plumbing layout all matter. This model has a total height of about 1705mm and a diameter of about 705mm, so the location needs to suit the unit physically as well as functionally.

There are both single and twin element variants in this size. The single element version uses a 3.6kW element, while the twin element version uses 2 x 4.8kW elements with an 80L boost capacity. Final installation scope depends on what is already at the property.

Why Choose a Quality Hot Water System Instead of a Cheaper Alternative?

A cheaper hot water system is not always the better result once installation suitability, durability, reliability, and actual hot water demand are properly considered. Even a straightforward electric storage hot water system still needs to be matched properly to the property and the way the home uses hot water.

The Thermann 400L Large Electric Storage is designed as a practical electric storage system, not just a budget box to be dropped into any situation. Features like Australian made tanks, dual-handed water connections, an easy-changeover footprint, and hard water element options all help make it a stronger practical option than a cheaper alternative chosen purely on upfront price.

That is why JR Gas & Water focuses on the right product and the right installation together, rather than treating hot water replacement like a one-size-fits-all job.

Professional Thermann 400L Large Electric Storage Installation in Brisbane & Gold Coast

JR Gas & Water provides professional Thermann 400L Large Electric Storage installation in Brisbane & Gold Coast, with the installation assessed around the property’s existing hot water setup, plumbing layout, electrical supply, available space, and actual household or site usage. Whether it is a hot water replacement in Brisbane or hot water installation on the Gold Coast, the goal is to make sure the system fits the property properly rather than simply swapping one tank for another.

We also service surrounding areas including Logan, Ipswich, Moreton Bay and Redlands. Our approach is practical and installation-led. That means checking whether the property suits a 400 litre electric storage hot water system, whether the electrical arrangement matches the chosen version, whether the installation location is suitable, and what may need to change to complete the installation safely and compliantly.

What’s Involved in Installing the Thermann 400L Large Electric Storage?

Installing the Thermann 400L Large Electric Storage involves more than removing one tank and dropping in another. Because it is an electric storage hot water system, the installation needs to account for electrical connection requirements, hot and cold water pipe connections, pressure control, relief valve arrangements, and whether the new unit suits the available installation location.

In a standard replacement scenario, the work may include removal of the old hot water system, positioning the new unit, connecting hot and cold water pipework, checking or replacing valves where required, confirming pressure control requirements, connecting the electrical supply, commissioning the system, and testing operation. Depending on the site, that may also include electrical changes, pipework rerouting, improved drainage arrangements, base preparation, or relocation to a better position.

It is also important to note that the tank must be filled with water before connecting to power.

Why Choose JR Gas & Water?

JR Gas & Water is installation-led, which matters even with a straightforward electric storage hot water system. The real result depends on whether the unit suits the property, the electrical supply, the plumbing arrangement, the installation location, and the way hot water is actually used.

We work with real homes across Brisbane and the Gold Coast, helping customers choose the right setup for their property rather than relying on generic brochure claims. With a model like the Thermann 400L Large Electric Storage, that means practical advice, realistic installation assessment, and a clearer process from product selection through to installation.

Thermann 400L Large Electric Storage Installation FAQs

How much does Thermann 400L Large Electric Storage installation cost in Brisbane or the Gold Coast?

Installation cost depends on what is already at the property. A straightforward like-for-like electric storage replacement in a suitable location is usually simpler than a job requiring electrical changes, valve upgrades, plumbing alterations, or relocation. Final pricing depends on the site, access, and what is required for a safe and compliant installation.

Is the Thermann 400L Large Electric Storage right for my home?

It can be a strong option for homes or properties wanting a practical 400 litre electric storage hot water system. It is generally better suited to high hot water demand rather than light or moderate household use.

What is included in a standard Thermann 400L Large Electric Storage installation?

A standard installation typically includes the core labour and materials needed to install the new system in a suitable location and connect it to existing services where conditions allow. That may include removal of the old unit, plumbing connections, valve assessment, electrical connection, commissioning, and operational checks. Extra works may still be required depending on the site.

What warranty comes with the Thermann 400L Large Electric Storage?

This model has a 10 year tank warranty and 1 year parts and labour for domestic use. On a timed recirculation system, the tank warranty reduces to 3 years. Commercial warranty is also 3 years on the tank with 1 year parts and labour.

Can JR Gas & Water install the Thermann 400L Large Electric Storage in my area?

JR Gas & Water installs the Thermann 400L Large Electric Storage across Brisbane and the Gold Coast, and also services Logan, Ipswich, Moreton Bay and Redlands. Availability depends on the job type, timing, and site conditions, but we regularly handle electric hot water installation across these areas.

Solar Hot Water System Package Selection Guide

(Please rotate mobile device to landscape for easy viewing)

Choosing the right Solar hot water system package depends on your installation needs, household size, and whether additional electrical work is required. Use this guide to compare package levels and find the best fit for your home.

Selecting the right package helps streamline installation, but we understand that needs may change, and that the purchaser isn’t a plumber. We’re flexible and can make adjustments, such as upgrading to the next package as needed.

💡 Which Package is Right for You?

✅ Base – For compliant replacements
Ideal for identical direct swaps where the existing system meets compliance. No extra plumbing, electrical work or disposal required or included.

(EXAMPLE - A Rheem Loline 325 replacing complaint Rheem loline 325 not a Rheem loline 400l)

✅ Silver – For minor upgrades
Includes pipework alterations and a valve kit but does not include electrical modifications or system disposal. Designed for those swapping a similar system and working to a tight budget. 

(EXAMPLE - Swapping a 10year old Rheem Loline 400L with a new Rheem Loline 325 where the existing installation is good but requires pipework alterations to adapt the new unit and new valve set for warranty)

🏆 Gold (Best Seller) – For standard installations
Covers old system removal and plumbing modifications, making it the most common choice for standard installations.

(EXAMPLE - Swapping a 20year old Dux Ecosmart with a new Envirosun AS315, Strip all down and redo the valves, pipework, drain lines, support base and dispose of the old unit)

💰 Sapphire (Best Value) – For installations requiring electrical work
Adds electrical safety features like an isolator, safety switch, and cable extensions to ensure a compliant and safe electrical connection.

(EXAMPLE - Swapping an old Conergy High Mount Boosted Unit with a new Envirosun AS400 mid mount boosted system that requires a lower hardwired electrical connection, then strip all down and redo the valves, pipework, drain lines, support base and dispose of the old unit)

✅ Diamond – For homes needing extensive electrical work
Provides extra plumbing and electrical modifications, including a new electrical circuit, making it ideal for homes without existing or undersized wiring for a solar system.

(EXAMPLE - Swapping an old solar system with undersized electrical with a new solar that needs its own dedicated 20amp electrical circuit, type then strip all down and redo the valves, pipework, drain lines, support base and dispose of the old unit)

✅ Platinum – The ultimate package
Includes everything – system relocation, extensive plumbing and electrical upgrades, solar circulating lines, and a new electrical circuit for complete installation flexibility.

(EXAMPLE - Replacing any existing system of any type then relocating it to a new position on the house that requires the electrical/plumbing to be installed or relocated to the new installation position)

🏆 Package Comparison Guide

Whenever a product is required, we only source from trusted, warranty‑backed manufacturers:

• Valves – AVG, RMC, Rye Metal (and subsidiaries)
• Copper – Type B Kembla or Crane
• PEX Systems - Ezipex
• Insulation – eFlex or K‑Flex
• Electrical switches & timers – Hager
• Conduit – Medium Duty PVC Vinidex or GTS
• Brassware – Brasshards
• Hydraulic crimp fittings – EziPress, Viega, Kembla
• Sealants – Loxeal

Feel free to let us know if you have any other preferred brands!

🛠 Need Help Choosing?

Not sure which package is right for you? Contact JR Gas & Water, and we’ll help you select the best solution for your home!

Solar hot water systems are an efficient and environmentally friendly way to heat your water, using energy from the sun to reduce electricity or gas consumption. To continue operating efficiently and reliably, they require regular maintenance and servicing.

Like any hot water system, manufacturers recommend routine maintenance to maximise system performance, protect key components and support your manufacturer's warranty.

Homeowner Maintenance – Every 6 Months

Every six months we recommend carrying out a simple visual inspection of your solar hot water system.

Homeowners should:

• Carefully operate the Pressure & Temperature Relief (PTR) Valve.
• Operate the Expansion Control Valve (ECV) (where fitted).
• Check for water leaks around the storage tank and pipework.
• Inspect visible solar pipe insulation for deterioration.
• Ensure solar collectors are free from excessive dirt, leaves and debris where safely accessible.
• Check for signs of corrosion or rust.
• Listen for unusual noises from the system or circulating pump (where fitted).

Why is this important?

Regular operation of the PTR and ECV valves helps prevent mineral build-up that can cause the valves to seize or leak.

Keeping collectors and surrounding components clean allows the solar system to operate as efficiently as possible, while early detection of leaks or damaged insulation can prevent larger problems from developing.

Important: Always follow your manufacturer's instructions when operating safety valves, as hot water will discharge during testing. Do not climb onto your roof to inspect or clean collectors. If you're unsure, contact a licensed plumber.

JR 6-Month Solar Hot Water Health Check

Recommended Service – $99

Our professional inspection helps ensure your solar hot water system continues operating safely and efficiently while identifying issues before they become costly repairs.

Our technician will:

• Inspect the complete hot water system.
• Check for leaks and corrosion.
• Test the PTR valve.
• Test the ECV (where fitted).
• Inspect exposed solar pipework and insulation.
• Check storage tank condition.
• Inspect booster operation (electric or gas).
• Check circulating pump operation (where fitted).
• Inspect controller operation (where applicable).
• Confirm system heating performance.
• Inspect valves, fittings and pipework.
• Identify components showing signs of wear.

Service Price: $99

Routine inspections help maximise solar efficiency, reduce energy costs and minimise the likelihood of unexpected breakdowns.

Recommended 5-Year Major Service

Current Price: $449

Most solar storage hot water systems benefit from scheduled replacement of key components to maintain reliable performance and extend the life of the storage tank.

Our comprehensive 5-Year Service includes:

• Replacement of the sacrificial anode (where fitted).
• Replacement of the Pressure & Temperature Relief (PTR) Valve.
• Replacement of the Expansion Control Valve (ECV).
• Inspection of the solar collectors.
• Inspection of solar pipework and insulation.
• Inspection of circulating pump and controller (where fitted).
• Inspection of booster operation.
• Full operational testing.
• Leak and corrosion inspection.

Why These Components Matter

Sacrificial Anode

Most vitreous enamel-lined solar storage tanks contain a sacrificial anode.

The anode gradually corrodes instead of the steel storage tank, protecting it from internal rust. Once the anode has been consumed, the tank itself begins to corrode, which can eventually lead to leaks and tank failure.

Replacing the anode at the recommended interval is one of the best ways to extend the life of your hot water system.

Pressure & Temperature Relief (PTR) Valve

The PTR valve protects the storage tank by safely relieving excessive pressure and temperature.

Mineral deposits and normal wear can prevent the valve from operating correctly over time, making routine testing and replacement essential.

Expansion Control Valve (ECV)

Where fitted, the ECV controls pressure created as water expands during heating.

Maintaining the ECV helps reduce stress on the storage tank and plumbing system, contributing to a longer service life.

Solar Collectors & Pipework

Solar collectors capture the sun's energy to heat water, while insulated pipework transfers that heat to the storage tank.

Keeping collectors unobstructed and ensuring pipe insulation remains in good condition helps:

• Maximise solar efficiency.
• Reduce reliance on electric or gas boosting.
• Lower energy costs.
• Improve overall system performance.

If Your Hot Water System Isn't Working

Before arranging a service, check the following:

• Ensure power is switched on (for electric boosted systems).
• Confirm the gas supply is on (for gas boosted systems).
• Check circuit breakers and safety switches where applicable.
• Verify the booster has not been turned off.
• Inspect for visible water leaks.
• Ensure exposed solar pipe insulation has not been damaged.
• Check for controller fault codes (where fitted).
• Listen for unusual noises from the circulating pump (where fitted).
• Remember that several cloudy days may reduce solar heating, causing the booster to operate more frequently.

If your system is still not producing adequate hot water, contact JR Gas & Water for professional diagnosis and repair.

General Signs Your System May Need Attention

Arrange a service if you notice:

• Reduced hot water availability.
• Booster operating more frequently than usual.
• Water leaking from the tank or pipework.
• Constant dripping from relief valves.
• Visible corrosion.
• Damaged or deteriorated pipe insulation.
• Pump noise or failure (where fitted).
• Controller fault codes.
• Rust-coloured or dirty water.
• Unusual noises during operation.

Early servicing can often prevent more expensive repairs and extend the life of your solar hot water system.

Protect Your Warranty & Maximise System Life

Routine maintenance helps ensure your solar hot water system continues operating safely, efficiently and reliably.

Following the manufacturer's recommended maintenance schedule may also assist in maintaining warranty coverage.

Failure to maintain your system may result in:

• Premature tank corrosion.
• Reduced solar efficiency.
• Higher electricity or gas consumption.
• Leaking or seized safety valves.
• Unexpected loss of hot water.
• Shortened system lifespan.
• Possible reduction or loss of manufacturer warranty, depending on the manufacturer's maintenance requirements.

Preventative maintenance is one of the best ways to protect your investment, reduce operating costs and maximise the life of your solar hot water system.

Please note: Maintenance requirements vary between manufacturers and models. Always refer to your owner's manual for the maintenance schedule applicable to your solar hot water system. JR Gas & Water services all major solar hot water brands in accordance with manufacturer recommendations where applicable.

If you're in Queensland and considering a heat pump hot water system, look no further than JR Gas & Water. 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 heat pump 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 heat pump 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 heat pump 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 heat pump 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.

Sustainable and Environmentally Friendly: Heat pump hot water systems are a sustainable and environmentally friendly option for heating water. They use renewable energy sources, such as air or ground heat, to heat water, resulting in lower greenhouse gas emissions and reduced energy bills. JR Gas & Water can help you make the switch to a more sustainable and cost-effective solution for your hot water needs.