Dux is an Australian hot water brand with a history dating back to 1915, offering electric storage ranges with a 7- to 10-year tank warranty (depending on the model) and a lineup that stretches from small electric storage units to gas, solar, and heat pump systems. Let’s look at what makes the range worth considering, and what to check before you book an install.
Dux has manufactured hot water systems in Australia since 1915, making it one of the oldest names in the industry. The brand is now part of the Noritz group, a major Japanese manufacturer, which has meant more investment in research and quality control without moving production offshore.
On reliability, Dux sits in solid mid-to-upper territory. Its Proflo electric storage range carries a 7-year tank warranty on the smaller 25L and 50L models, stepping up to a 10-year tank warranty on the larger 80L to 400L units, plus a 1-year parts and labour warranty across the board. It’s not the longest warranty on the market, but Dux has been building tanks for Australian conditions for over a century, and that experience shows in the build.
If you’re deciding between Dux and a more premium brand, Dux won’t out-warranty everything on the shelf. Instead, it offers a proven, Australian-made product at a price point that makes sense for a straightforward tank replacement.
Dux also picked up Canstar Blue’s Most Satisfied Customers award for hot water systems in 2022, scoring well on performance, value for money, and ease of use, which lines up with what most tradespeople see on the tools: a tank that does the job without drama.
Proflo is the electric storage line, but it’s only one part of what Dux makes. Understanding the full range helps if you’re weighing up electric against gas or a heat pump for a replacement.
Prodigy is Dux’s gas storage range, available in 4- and 5-star efficiency models with natural gas and LPG options. It doesn’t need a power point to run, which some households prefer for backup during a blackout. The Always Hot line covers continuous flow, including condensing models that run cooler exhaust temperatures and use less gas per litre heated than the older non-condensing style.
At the top of the range, Ecosmart is Dux’s heat pump system, aimed at households wanting to cut electricity use for hot water without going solar.
If you’re replacing an existing electric storage tank and don’t have a strong reason to switch fuel type, Proflo is the like-for-like option. If you’re open to changing systems, it’s worth having a proper conversation about heat pump or continuous flow before locking in another electric storage tank, since the running costs can differ substantially over the life of the system.
The Proflo range covers a wide spread of household sizes, from tight apartment cupboards through to large family homes.
| Capacity | Typical household size |
| 25L to 50L | 1 to 2 people, or a small supplementary system |
| 80L to 125L | 2 to 3 people |
| 160L to 250L | 3 to 4 people |
| 315L to 400L | 5 or more people |
The smaller 25L and 50L models are designed to fit in compact spaces and are available as either hardwired or plug-in units, making them a common choice for unit renovations where cupboard space is tight. The larger models use commercial-grade enamel and a bigger anode to extend tank life, and they’re built for both indoor and outdoor installation.
As a general rule, it’s better to size slightly up than to undersize and run out of hot water halfway through a shower. If you’re close to a capacity boundary, talk it through with your installer rather than guessing, and factor in things a table can’t capture, like whether you regularly have guests staying, run a bath most nights, or have a second bathroom drawing from the same tank.
Warranty length is one of the first things people compare between brands, but the numbers vary by model, not just by brand.
| Brand and series | Cylinder warranty | Labour and parts |
| Dux Proflo (25L to 50L) | 7 years | 1 year parts and labour |
| Dux Proflo (80L to 400L) | 10 years | 1 year parts and labour |
| Rheem 191/192 series (25L to 160L) | 7 years | 1 year parts and labour |
| Rheem 491/492 series (250L to 400L) | 10 to 12 years | 1 year parts and labour |
| AquaMax electric storage | Up to 10 years | 1 year parts and labour |
The pattern across all three brands is similar: smaller tanks generally have shorter cylinder warranties than larger models, and parts and labour warranties are 1 year regardless of tank size. Rheem’s largest electric units currently lead on cylinder warranty length, but Dux and AquaMax aren’t far behind, and warranty length is only one consideration. Build quality, local parts availability and how easy the brand is to service all matter just as much when something eventually needs attention.
Yes. Dux electric storage systems are built to run on controlled load and off-peak tariffs, which is one of the main reasons people choose electric storage over continuous flow in the first place.
What’s changed recently is that the old assumption of a fixed overnight window no longer holds everywhere. Networks like Ausgrid in NSW have been shifting controlled load switching times to make better use of daytime solar generation, so your tank might now heat for part of the day rather than purely overnight. Victorian networks including Citipower are partway through a similar transition. Queensland’s tariff structure still separates a shorter overnight tariff from a longer minimum-hours tariff, and the exact split depends on your retailer and location.
The takeaway is that a Dux electric storage tank will work with whatever off-peak or controlled load arrangement your property has, but your network and retailer set the specific hours, not Dux. Check your latest bill or call your retailer to confirm your current switching times before you finalise a tank size, since a bigger tank gives you more buffer if your off-peak window is shorter than expected.
If you’re on a tight overnight-only window, a smaller tank that heats fully within a short controlled load period will recover faster once demand catches up, but it also gives you less buffer if that window gets shorter due to network changes. If your area is affected by one of the shifts described above, sizing slightly larger than the bare minimum is a reasonable way to hedge against tighter off-peak hours down the track.
Every Dux Proflo unit needs clear access to the element, thermostat, pressure and temperature relief valve, and anode for servicing, and Dux’s installation documentation is specific about this, even though the exact clearance depends on the model and where it’s going.
A few practical things worth checking before booking:
Because clearance requirements are model-specific, the safest approach is to have your installer confirm the exact figures for your chosen model against the current Dux installation manual before the day of the install. Getting this wrong is one of the more common reasons a same-day job has to be rescheduled.
Dux also recommends installation in line with AS/NZS 3500.4, the Australian standard covering heated water services, and in Victoria a licensed person under the Victorian Building Act must carry out the job. None of this is unique to Dux; it’s standard practice across the industry, but it’s worth mentioning because a system installed outside these requirements can affect both your warranty and your insurance if something goes wrong later.
Dux electric storage units are common enough that same-day supply and installation is realistic in most of our service areas, provided the replacement is a straightforward like-for-like swap, and the site is ready to go. Complications like changed capacity, relocated plumbing, or electrical upgrades can push the job to a scheduled installation instead.
If you’re chasing a same-day fix, the fastest way to confirm availability for your address and preferred capacity is to get in touch directly, since stock and technician availability shift day to day.
Electric storage tanks fail in fairly predictable ways, and the symptom usually points to the faulty component.
These are useful starting points, not a diagnosis. Electric hot water systems involve mains voltage and pressurised hot water, so any fault beyond checking the circuit breaker should go to a licensed technician rather than a DIY fix.
Installed pricing for the Dux range typically starts from around $1,450–$1,500 for a smaller electric storage unit and runs up to roughly $4,000 for the Dux Ecosmart heat pump system, with the exact figure depending on tank size, installation complexity and your location. Straightforward like-for-like electric storage replacements sit toward the lower end of that range, while heat pump and larger capacity installs sit toward the top.
Pricing is current at the time of writing and can shift with supply costs, so confirm the number for your specific model and address before you commit.
Dux has been building hot water systems in Australia since 1915, and its Proflo electric storage range holds up well against other established brands on warranty, build quality and value. If you’re weighing up Dux against another brand, or you just need a straightforward replacement sorted quickly, get in touch, and our team at Same Day Hot Water can talk you through the right model for your home.