JR Gas and Water
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Did You Know a Heat Pump Could Save Your Family As Much 80% on Your Hot Water Energy Bills
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🏷️ Brand:
🔢 Model Number:
📦 Volume: L
📏 Width: mm
📐 Height: mm
🌍 Manufactured In:
🛠️ Heat Exchange Material:
🛡️ Cylinder/Heat-Exchange Warranty: Years
🔇 Noise Level: dBa
⚖️ Dry Weight: kg
📡 WiFi Controller:
⏲️ Built-In Timer:
💡 LED/LCD Status Indicator:
📊 Coefficient of Performance (COP):
⚡ Energy Source:
IMPORTANT - Default supply is Natural Gas — please leave a note at checkout if LPG is required where available.
Vulcan DUOMAX 20 Continuous Flow Gas Hot Water System – Supply & Installation Brisbane & Gold Coast
Compact. Reliable. Endless hot water for Aussie homes.
Looking for an energy-efficient way to enjoy continuous hot water across two bathrooms? The Vulcan DUOMAX 20 delivers exactly that—on demand, every time. With a flow rate of 20L/min, this system is ideal for families of 3–5 who don’t want to wait or run out of hot water.
At JR Gas & Water, we don’t just sell—we install, service, and back your system with expert care. As the Best Plumbers and Best Home Care Store winners three years running (2023, 2024 & 2025), we provide seamless gas hot water upgrades in Brisbane and Gold Coast suburbs.
Why Choose the Vulcan DUOMAX 20?
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🔥 20L/min flow rate – Supports 2 bathrooms for medium to large homes
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💧 Continuous flow technology – Never runs out, even during peak usage
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🔋 6-Star energy efficiency – Save on gas bills while reducing emissions
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📏 Slimline, wall-mounted unit – Great for homes with limited space
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🌡️ Precise temperature control – Safer water for kids and families
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⚙️ Compatible with Natural Gas or LPG – We’ll match your setup
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🇦🇺 Made in Australia – Built tough for local conditions
Perfect For:
✔ Households of 3–5 people
✔ Homes with 2 bathrooms
✔ Families upgrading from storage tanks or older gas systems
✔ Anyone wanting compact, low-maintenance hot water performance
What’s Included With JR Gas & Water?
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🧰 Supply & full installation by licensed plumbers & gas fitters
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✅ QBCC Form 4 for compliance & peace of mind
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🔧 All fittings, pipework & connections as required
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🧼 Removal of old hot water unit
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🏆 Award-winning customer care from a locally owned business
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💬 Expert advice & post-install support
Installation Package Options
Base Package
Perfect for replacing a compatible existing system—includes installation and certification only.
Silver Package
Great for replacing older systems—includes all new valves, gas upgrades, and minor reworks for optimal performance.
Gold Package
Complete upgrade package—ideal for replacing outdated electric or non-compliant systems. Includes new valves, insulation, upgraded pipework, concrete base, and system removal.
Frequently Asked Questions
Q: Will the DUOMAX 20 suit my family?
A: Yes, it’s ideal for families of 3–5 with 2 bathrooms.
Q: Can this run multiple taps at once?
A: Absolutely. With 20L per minute capacity, it can handle simultaneous use in two bathrooms.
Q: Is LPG an option?
A: Yes, the DUOMAX 20 is available in both natural gas and LPG models.
Q: What is the warranty?
A: 10-year heat exchanger warranty and 3 years on parts and labour.
Q: Can I install it indoors?
A: No. The DUOMAX 20 is designed for outdoor installation only.
Ready for Reliable Hot Water?
Upgrade to the Vulcan DUOMAX 20 Continuous Flow Gas Hot Water System and enjoy the comfort of non-stop hot water with expert installation from JR Gas & Water. Whether you’re in Brisbane or on the Gold Coast, we’ve got you covered.
🔧 See our full Gas Hot Water Range or book installation today.
🔥 Instant Gas Hot Water System Package Selection Guide
(Please rotate your mobile device for easier viewing)
Choosing the right instant gas hot water system package depends on your current setup, whether plumbing or gas upgrades are needed, and if any relocation or compliance work is required. Use this guide to compare package levels and find the best match for your home.
We know things don’t always go to plan — and most customers aren’t plumbers — so we’re flexible and happy to adjust your installation package if needed.
💡 Which Package Is Right for You?
IMPORTANT: All online packages are for EXTERNAL installations only. For internal installations, please request a quote.
✅ Base – For compliant replacements of existing identical EXTERNAL instant systems
Best for like-for-like swaps where the existing system is fully compliant and the same make/model/series. No gas line changes, electrical work, or plumbing alterations.
🧰 Example: Replacing a Rinnai B26 with a Rinnai B26 on the same wall with compliant gas supply.
✅ Silver – For minor upgrades
Includes small plumbing adjustments and a new valve kit. No gas line modifications or system disposal. Designed for customers on a budget upgrading to a slightly different model.
🧰 Example: Replacing a Rheem 26 with a Rinnai B26 where the gas line is compliant but pipework needs modifying to suit and valves need replacing for warranty.
🏆 Gold – Best Seller – For standard installations
Covers everything needed for a standard upgrade: removal of old unit, plumbing changes, valves, and a tempering valve.
🧰 Example: Upgrading from an old Bosch 16P Instant to a new Bosch 16H that requires a tempering valve, with full plumbing refresh and removal of old unit.
💰 Sapphire – Best Value – For installations requiring gas upgrades
Everything in the Gold package plus gas line upgrades or a new gas main from meter to unit to ensure safe and compliant installation.
🧰 Example: Switching from a smaller capacity like a 13L to a larger 26L instant system that needs a larger gas main and full plumbing setup.
✅ Diamond – For major gas plumbing overhauls
Adds extended gas runs, upgraded regulators or meter connections and a new power point. Ideal for homes switching to gas or where old systems were severely non-compliant.
🧰 Example: Changing from electric to gas in a home with no current gas line in the right location, requiring a full line upgrade.
✅ Platinum – The ultimate package
Includes everything: relocation, extensive plumbing, and full gas installation or rerouting. Ideal for complex installs or new system placements.
🧰 Example: Moving the hot water system to the opposite side of the home and running a new gas line with full setup and all compliance.
🏆 Package Comparison Guide
Here’s your revised Package Comparison Guide with the new line added as the third row, directly under “Existing System Must Be Same Type & Location”:
| Feature | Base | Silver | Gold 🏆 | Sapphire 💰 | Diamond | Platinum |
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| ✅ Existing System Must Be Identical Make/Model as Purchase with Compliant Installation | ✅ | ❌ | ❌ | ❌ | ❌ | ❌ |
| ⚠️ Includes gas supply upgrade to suit larger capacity unit (e.g. 16L replaced with 16L or larger) | ❌ | ❌ | ❌ | ✅ | ❌ | ✅ |
| ✅ Form 4 (Compliance Certificate) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| 🔧 Pipework Alterations | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
| 🔧 Valve Kit | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ |
| 📏 Pipework Included (m) | ❌ | 2m | 4m | 14m | 4m | 24m |
| 🧱 Support Base (if ground is soft/uneven) | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ |
| 🗑️ Old System Disposal | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ |
| 🔧 Powerpoint | ❌ | ❌ | ❌ | ✅ | ✅ | ✅ |
| 🔥 Gas Line Upgrade / New Gas Main | ❌ | ❌ | ❌ | ✅ | ❌ | ✅ |
| 📦 System Relocation | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ |
| ✅ Requires Compliant Existing Install | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ |
🔧 Trusted Materials, Backed by Quality
We only use high-grade parts from reputable manufacturers:
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Valves – AVG, RMC, Rye Metal
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Copper Pipe – Kembla Type B, Crane
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PEX Plumbing – Ezipex
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Insulation – eFlex, K-Flex
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Brassware – Brasshards
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Gas Components – Bromic, EziPress, Viega
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Sealants – Loxeal
Let us know if you have any specific brands or components you’d like us to use.
🛠 Need Help Choosing?
Still unsure which package is right for your home?
The JR Gas & Water team is here to help.
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.
