🏷️ Brand – Envirosun
🔢 Model Number – ES330M9
💧 Volume (L) – 330
👨‍👩‍👧‍👦 Recommended Maximum Number of Occupants – 6-7
💰 Estimated Annual Savings* – $1222.50
📊 Coefficient of Performance (COP) – 4.04
🔌 Electrical Connection Type – 10 Amp Plug & Lead
📏 Width – 710mm
📏 Height – 1923mm
⚖️ Weight – 119kg
🌍 Manufactured In – China
🔩 Cylinder/Heat Exchange Material – Steel/Enamel
🛡️ Cylinder/Heat-Exchange Warranty – 7 Years
🔇 Noise Level – 42 dBa
🛏️ Avoid Install Next to Sleeping Areas – Yes
⚡ Energy Source – Solar
📡 WiFi Controller Built In or Compatible – No
⏲️ Built-In Timer – Yes
💡 LED/LCD Status Indicator – Yes

How Do STC Rebates Work?

Small-scale Technology Certificates, or STCs, are part of the Australian Government’s renewable energy scheme. Eligible heat pump and solar hot water systems can generate STCs, which carry a monetary value. JR Gas & Water applies this value as an upfront rebate so customers see a reduced out-of-pocket price on eligible products rather than needing to claim anything later themselves.

For clarity, JR Gas & Water uses a flat-rate STC rebate of $1,000 including GST on eligible systems. This means the price shown online is the customer’s out-of-pocket price after the rebate has already been applied. It is not the full gross system price before the rebate.

As an example, if a system is advertised online at $4,000, the gross system price is $5,000, less the $1,000 STC rebate, leaving the advertised out-of-pocket amount of $4,000.

This upfront rebate is offered on the basis that the installation will be completed compliantly, the system will remain eligible for STCs, and JR Gas & Water will be able to create, process, and receive the value of those certificates after installation. We handle the STC paperwork and process behind the scenes, but the rebate is conditional and relies on the job proceeding correctly from start to finish.

Who Is Eligible?

In general, customers may be eligible for the STC rebate where they are purchasing an approved solar hot water system, heat pump hot water system, or other eligible product that qualifies under the applicable scheme rules at the time of installation.

Eligibility generally requires that:
the product itself is STC eligible,
the installation address is eligible,
the system is installed in Australia,
the installation is completed in a compliant manner,
the system is capable of being properly verified,
and the customer provides any required information, declarations, signatures, and supporting documents needed to process the STCs.

Where JR Gas & Water advertises an eligible system with the rebate already applied, the customer is agreeing that the STCs will be assigned to JR Gas & Water or its nominated agent as part of the sale. That assignment is what allows the rebate to be applied upfront instead of the customer paying full price.

When Is the Rebate Not Available or Not Valid?

The STC rebate is not an automatic discount in every situation. It is only available where the installation proceeds fully and remains eligible for STC creation and assignment.

A customer may not be eligible, or may be required to repay the rebate amount, where:

the order is cancelled after rebate pricing has been applied,
the customer declines installation,
the site is not ready,
access is refused,
the installation cannot proceed due to hazards, animals, obstructions, or unsafe conditions,
the customer wants to keep the STCs personally,
required paperwork is not signed or returned,
incorrect or incomplete information is provided,
the property or system turns out not to qualify,
the quoted eligible product is changed,
a third party interferes with, alters, completes, disconnects, reconnects, or modifies the installation,
required compliance or upgrade works are refused,
or the installation cannot be lawfully completed in a way that allows the STCs to be validly claimed.

This also includes situations where another contractor performs part of the work in a way that affects eligibility, or where changes made by the customer or another trade prevent JR Gas & Water from receiving the STC benefit that the upfront rebate was based on.

What Happens If the Customer Does Not Proceed?

Where a customer accepts pricing that already includes the STC rebate and then cancels, postpones, declines installation, refuses access, or otherwise prevents the installation from being completed, JR Gas & Water may recover the full $1,000 STC rebate amount in addition to any other applicable cancellation, postponement, restocking, freight, attendance, or administrative charges.

This is because the lower advertised price was offered on the basis that JR Gas & Water would receive the benefit of the STCs after compliant completion of the installation. If the job does not proceed, that STC benefit cannot be recovered by JR Gas & Water, so the rebate amount becomes payable.

Can the Customer Keep the STCs Instead?

Yes, but not at the rebate-adjusted price.

If the customer wishes to keep, trade, or claim the STCs themselves, they must notify JR Gas & Water in writing before the order is accepted, or at the latest before installation begins. In that case, the customer must pay the full $1,000 including GST rebate amount before installation unless otherwise agreed in writing.

Heat pump hot water systems are one of the most energy-efficient ways to heat water, using ambient air to produce hot water while consuming significantly less electricity than a conventional electric storage system.

Like any appliance with refrigeration and mechanical components, regular maintenance is essential to maximise efficiency, maintain reliable performance and support your manufacturer's warranty.

Many manufacturers recommend routine inspections and servicing throughout the life of the system.

Homeowner Maintenance – Every 6 Months

Every six months we recommend carrying out a simple visual inspection of your heat pump system.

Homeowners should:

• Carefully operate the Pressure & Temperature Relief (PTR) Valve.
• Operate the Expansion Control Valve (ECV) (where fitted).
• Remove leaves, grass and debris from around the outdoor unit.
• Ensure the air inlet and outlet remain clear.
• Check the condensate drain is free-flowing.
• Inspect for obvious water leaks or corrosion.
• Listen for any unusual noises during operation.

Why is this important?

Heat pumps rely on unrestricted airflow to operate efficiently.

Blocked airflow, dirty coils or seized safety valves can reduce efficiency, increase electricity consumption and place unnecessary strain on the compressor.

Operating the PTR and ECV valves every six months also helps prevent mineral build-up and confirms they continue to function correctly.

Important: Always follow your manufacturer's instructions when operating safety valves, as hot water will discharge during testing. If you're unsure, contact a licensed plumber.

JR 6-Month Heat Pump Health Check

Recommended Service – $99

Our professional inspection helps identify small issues before they become costly repairs.

Our technician will:

• Inspect the complete heat pump system.
• Check for leaks or corrosion.
• Test the PTR valve.
• Test the ECV (where fitted).
• Inspect electrical wiring and connections.
• Check controller operation and settings.
• Inspect airflow around the outdoor unit.
• Check the evaporator coil for blockage or contamination.
• Inspect the condensate drain.
• Listen for abnormal compressor or fan operation.
• Confirm correct heating performance.
• Identify components showing signs of wear.

Service Price: $99

Routine inspections help maintain efficiency, reduce energy consumption and minimise the risk of unexpected breakdowns.

Recommended 5-Year Major Service

Current Price: $449

Like any major appliance, heat pump hot water systems benefit from scheduled component replacement and servicing.

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).
• Full inspection of the storage tank and heat pump unit.
• Electrical safety testing.
• Inspection of wiring and controls.
• Cleaning of the evaporator coil (where required).
• Inspection of fan and compressor operation.
• Inspection of condensate drainage.
• Leak and corrosion inspection.
• Operational performance testing.

Why These Components Matter

Sacrificial Anode

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

The anode corrodes instead of the steel tank, protecting it from internal rust.

Replacing the anode at the recommended interval can significantly extend the life of your storage tank.

Pressure & Temperature Relief (PTR) Valve

The PTR valve protects the storage tank from excessive pressure and temperature.

Over time, mineral deposits may prevent the valve from operating correctly, making regular testing and replacement essential.

Expansion Control Valve (ECV)

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

Maintaining the ECV helps protect both the storage tank and your home's plumbing system.

Airflow & Evaporator Coil

Unlike conventional electric systems, heat pumps rely on airflow across the evaporator coil to extract heat from the surrounding air.

Restricted airflow caused by leaves, dust or debris can:

• Reduce efficiency.
• Increase running costs.
• Extend heating times.
• Place additional strain on the compressor.

Keeping the unit clean helps maintain peak performance.

If Your Heat Pump Isn't Working

Before arranging a service, check the following:

• Ensure power is switched on.
• Check the circuit breaker and safety switch (RCD).
• Confirm the isolator near the unit is turned on.
• Check the controller for any fault or error codes.
• Ensure the air inlet and outlet are unobstructed.
• Remove any leaves or debris around the unit.
• Check for visible water leaks.
• Confirm the condensate drain is not blocked.
• Listen for unusual noises from the fan or compressor.
• Allow sufficient recovery time after heavy hot water usage.

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

General Signs Your System May Need Attention

Arrange a service if you notice:

• Little or no hot water.
• Unusual fan or compressor noises.
• Error codes on the controller.
• Constant water leaking.
• Reduced heating performance.
• Higher than normal electricity usage.
• Water taking much longer to heat.
• Visible corrosion.
• Repeated electrical trips.
• Restricted airflow due to dirt or debris.

Early servicing can often prevent more expensive repairs and prolong the life of your system.

Protect Your Warranty & Maximise System Life

Routine maintenance helps keep your heat pump operating safely, efficiently and reliably.

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

Failure to maintain your system may result in:

• Reduced energy efficiency.
• Increased electricity costs.
• Premature tank corrosion.
• Compressor strain.
• Shortened system lifespan.
• Unexpected breakdowns.
• Possible reduction or loss of manufacturer warranty, depending on the manufacturer's maintenance requirements.

Regular preventative maintenance is one of the best ways to protect your investment and ensure your heat pump continues delivering efficient hot water for many years.

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

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​

Estimated annual savings are calculated by comparing the heat pump’s energy efficiency (measured as COP – Coefficient of Performance) against a standard electric hot water system with a COP of 1.0. For example, if a heat pump has a COP of 4.0, it uses 75% less electricity to deliver the same amount of hot water.

Savings are based on average household usage for a family of five on Tariff 11 (general usage tariff), using manufacturer-stated COP values. The higher the COP, the greater the energy savings.

Bonus savings: When paired with a solar PV system, energy costs can drop even further — with some households seeing up to 50% additional savings, especially when the heat pump runs during solar generation times.

Disclaimer:

All estimated savings are based on manufacturer-provided COP values and standard usage assumptions (e.g. a family of five on Tariff 11). These figures are intended as a general guide to help compare different hot water units and technologies. Actual savings may vary depending on your household’s usage, energy rates, and installation conditions. We recommend conducting your own research or consulting an energy advisor to assess what’s best for your specific setup.

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.