🏷️ Brand –
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📦 Volume – L
📏 Width – mm
📐 Height – mm
🌍 Manufactured In –
🛠️ Cylinder / Heat Exchange Material –
🛡️ Cylinder / Heat-Exchange Warranty – Years
🔇 Noise Level – dBa
⚖️Dry Weight – kg
⚡ Energy Source – 📡 WiFi Controller Built-in or Compatible –
⏲️ Built-In Timer –
💡 LED/LCD Status Indicator –
📊 Coefficient of Performance (COP) –

iHeat 300L Twin Panel Solar Hot Water System

The iHeat 300L Twin Panel Solar Hot Water System is a roof-mounted electric boosted solar hot water system designed for family homes, higher hot water demand and properties with suitable roof space for two flat plate solar collectors.

It combines a 300L roof-mounted storage tank with twin all-copper solar collectors and electric boost backup. This gives homeowners strong solar hot water performance during suitable conditions, with automatic electric boosting available when solar contribution is not enough.

For medium to larger households, homes replacing an older roof-mounted solar system, and families wanting a traditional solar hot water setup with stronger solar collection than a single panel system, the iHeat 300L twin panel system is the stronger choice.

JR Gas & Water supplies and installs solar hot water systems across Brisbane, the Gold Coast, Logan, Ipswich, Redlands, Scenic Rim, Moreton Bay and surrounding South East Queensland areas.

Why Choose the iHeat 300L Twin Panel Solar Hot Water System?

The iHeat 300L twin panel system is designed for homeowners who want stronger solar hot water recovery from a roof-mounted system.

Key benefits include:

• 300L roof-mounted storage tank

• twin flat plate solar collectors

• electric boost backup

• close-coupled roof-mounted design

• thermosiphon circulation

• no electric circulation pump required

• open-loop solar hot water design

• all-copper collectors with black chrome selective coating

• 4m² collector surface area

• suitable for family-sized hot water demand

• ideal replacement for existing roof-mounted electric boosted solar systems

• designed for harsh Australian conditions

• WaterMark approved system range

• practical solar option for South East Queensland homes

For households that use more hot water than a single panel system can comfortably support, the twin panel version is the better fit.

Best For: Who the iHeat 300L Twin Panel Suits

The iHeat 300L twin panel solar hot water system is well suited to:

• medium to larger households

• family homes

• homes with 3–5 occupants

• properties with moderate to high hot water demand

• homes with good roof exposure

• houses with enough suitable roof space for twin collectors

• replacements of older roof-mounted solar hot water systems

• homeowners wanting electric boost backup

• households with regular evening shower demand

• buyers wanting stronger solar contribution than a single panel setup

It is generally not the best option for homes with poor roof orientation, heavy shading, difficult roof access, or roof structures that are not suitable for a roof-mounted tank and collectors.

What the iHeat 300L Twin Panel System Is Best Known For

The iHeat 300L twin panel system is best known for combining a family-sized 300L roof-mounted tank with two flat plate solar collectors.

That matters because many households need more solar collection than a single panel system can provide. A twin panel system is usually the better fit when:

• hot water use is moderate to high

• more people shower each day

• the household has regular evening demand

• solar recovery matters

• the roof has suitable collector space

• the existing system is already a twin panel roof-mounted unit

• the customer wants a more capable solar hot water replacement

This makes the iHeat 300L twin panel system a practical option for family homes that want solar hot water with electric boost backup.

Roof-Mounted Thermosiphon Design

The iHeat 300L twin panel system uses a traditional close-coupled roof-mounted solar hot water design. The tank and collectors are installed together on the roof, keeping the main system components off the ground and making use of available roof space.

The system uses natural thermosiphon circulation. As water heats in the collectors, it rises into the storage tank without needing a separate circulation pump. This helps keep the system simple and low maintenance compared with pump-driven split solar systems.

Roof suitability is still critical. The roof structure, pitch, orientation, shading, access and existing pipework all need to be assessed before installation.

Twin Flat Plate Solar Collectors

The twin panel setup gives the system greater solar collection area than the single panel version. This makes it better suited to family hot water demand and homes where solar contribution needs to be stronger across the day.

The confirmed twin collector specification is:

The twin panel design is best suited to homes with enough suitable roof space and stronger hot water demand than a single collector system is designed to handle.

Electric Boost Backup

The iHeat 300L twin panel system includes electric boost backup using an in-tank electric element.

The electric booster helps maintain hot water availability when solar input is not enough, such as during cloudy weather, high hot water use, winter conditions or periods of lower solar contribution.

This makes the system more practical for everyday family use because the home is not relying on solar input alone.

iHeat 300L Twin Panel Specifications

Specs should always be checked against the exact current unit supplied, site conditions and manufacturer documentation at the time of installation.

iHeat 300L Twin Panel vs Single Panel Solar Hot Water

The iHeat 300L twin panel system is usually the better fit when:

• the household has higher hot water demand

• the home has 3–5 occupants

• more people shower each day

• roof space is available for two collectors

• stronger solar recovery is preferred

• the existing system is already a twin panel roof-mounted unit

• the customer wants a family-sized solar hot water system

The iHeat 300L single panel system is usually better when:

• the household has lighter hot water use

• roof space is limited

• the home has 1–3 occupants

• upfront cost and roof footprint matter more

• solar exposure is strong and demand is moderate

The best option depends on household size, shower habits, roof orientation, usable roof space and how much hot water the home actually uses.

iHeat 300L Twin Panel vs Standard Electric Hot Water

A standard electric storage hot water system is usually simpler and cheaper upfront, but it relies on electric heating rather than solar contribution.

The iHeat 300L twin panel solar hot water system is the better fit when you want:

• solar-assisted hot water

• stronger solar collection than a single panel setup

• electric boost backup

• a roof-mounted system

• lower reliance on standard electric water heating

• a replacement for an older roof-mounted solar unit

• a family-sized solar hot water option

A standard electric hot water system may still suit homes where roof mounting is not suitable, roof access is difficult, or the lowest upfront replacement cost is the main priority.

iHeat 300L Twin Panel vs Heat Pump Hot Water

A heat pump hot water system is usually installed at ground level and uses heat from the surrounding air to heat the stored water. It can be a strong option for homes where roof-mounted solar is not suitable.

The iHeat 300L twin panel solar system is better when:

• the home already has a roof-mounted solar system

• the roof has good solar exposure

• the roof can support the system

• ground-level space is limited

• the homeowner prefers traditional solar hot water

• a like-for-like roof-mounted replacement is practical

A heat pump may be better when:

• roof access is difficult

• the roof structure is unsuitable

• shading affects solar performance

• the customer wants a ground-mounted hot water system

• the home has solar PV and wants daytime electric hot water heating

Both options can work well in South East Queensland. The right choice depends on the property layout, budget, roof suitability and household usage.

Installation Requirements

A roof-mounted solar hot water system needs proper site assessment before installation.

Key installation factors include:

• roof structure and load capacity

• roof pitch

• roof orientation

• shading from trees or nearby buildings

• safe roof access

• crane or lifting access where required

• usable roof space for twin collectors

• hot and cold pipework layout

• existing system location

• electrical boost connection

• tempering valve requirements

• pressure control valves

• drainage and relief valve discharge

• water quality

• local plumbing and electrical compliance

Because the tank and collectors sit on the roof, the roof must be suitable for the system. The system also needs to be positioned to support safe access, good solar exposure and practical pipework routes.

Professional iHeat Solar Hot Water Installation in Brisbane & Gold Coast

JR Gas & Water provides professional solar hot water installation across Brisbane, the Gold Coast and South East Queensland.

A standard installation may include removing the old hot water system where required, lifting and positioning the new roof-mounted solar system, connecting compliant plumbing, arranging licensed electrical work for the boost connection where needed, fitting required valves, testing operation and commissioning the system.

Some installations may need extra work depending on roof access, roof condition, system weight, electrical requirements, pipework changes, valve upgrades, lifting access and whether the existing system is being replaced like-for-like.

Same-Day Installation Available on Suitable Jobs

Same-day installation may be available on suitable iHeat 300L twin panel solar replacements, depending on stock, roof access, weather, lifting requirements, electrical readiness and the existing system setup.

Straightforward like-for-like replacements are usually the fastest. More involved jobs may take longer if roof access is difficult, the system location needs to change, electrical work is required, or the old unit is difficult to remove safely.

The goal is always to install the system properly, not rush a roof-mounted solar job that needs safe lifting, compliant plumbing and correct commissioning.

Why Homeowners Choose JR Gas & Water

Choosing the right installer matters with roof-mounted solar hot water because the final result depends on more than just tank size.

Customers choose JR Gas & Water for:

• licensed hot water installation

• practical solar hot water advice

• help comparing solar, electric, heat pump and gas options

• safe roof-mounted system replacement

• local service across Brisbane and the Gold Coast

• same-day installation on suitable jobs

• clear installation pathways

• lifetime workmanship warranty on installation

JR Gas & Water focuses on matching the system to the property, roof layout, household demand and long-term hot water needs.

iHeat 300L Twin Panel Solar Hot Water for South East Queensland Homes

If you need an iHeat 300L twin panel solar hot water system supplied and installed in Brisbane, the Gold Coast or South East Queensland, JR Gas & Water can help assess whether this style of system suits your home.

The iHeat 300L twin panel system is best suited to family homes with good roof exposure, moderate to high hot water use and a suitable roof structure. It is a practical option for homeowners wanting solar hot water with electric boost backup in a roof-mounted design.

Choose JR Gas & Water for expert advice, licensed installation and practical solar hot water solutions tailored to your property.

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.