If you’re in the market for a new hot water system, chances are you’ve come across Dux. They’re one of Australia’s most trusted brands — and for good reason.
But with so many models on offer, from electric storage to heat pumps, how do you know which Dux system is right for your home?
I’ve helped several clients navigate this exact decision, and one thing I always tell them is this: start by understanding how you use hot water. Once you do that, choosing the best Dux hot water system becomes much simpler.
In this guide, I’ll walk you through the key differences between popular Dux systems and what to consider before you buy.
Why Dux?
Before we dive into comparisons, it’s worth noting why Dux remains such a popular choice:
- Australian-owned with over 100 years of experience
- Solid warranties and after-sales support
- Wide range of products for different needs and budgets
- Known for energy-efficient innovations
Many local plumbers I’ve worked with swear by their reliability, and parts availability is excellent — something worth considering for long-term maintenance.
Dux 400L electric storage: who is it for?
The Dux 400L electric storage unit is one of their most popular large-capacity options — ideal for bigger households.
Typical buyers include:
- Families of 5+ people
- Homes with high hot water usage (multiple bathrooms, laundry, kitchen)
- Properties where solar/gas isn’t practical
Pros:
✅ Large capacity — plenty of hot water even during peak times
✅ Compatible with off-peak tariffs (can lower running costs)
✅ Straightforward installation and replacement
Cons: ⚠️ Higher energy costs if run on continuous tariff ⚠️ Bigger footprint — needs space for installation
Compared to smaller Dux units
If you’re a smaller household, Dux offers plenty of other options, such as:
Dux 250L or 315L electric storage
Great for:
- Families of 3–4
- Medium homes
- Budget-conscious buyers
Dux 50L to 125L compact units
Perfect for:
- Apartments
- Granny flats
- Secondary bathrooms
What about hot water tanks and energy efficiency?
No matter which size or model you’re considering, it’s smart to check current government guidelines on hot water tanks and efficiency ratings.
Australia offers various rebates and incentives for upgrading to more efficient systems, and running costs can vary hugely between models.
For instance, pairing an electric storage system with a solar PV system or using an off-peak tariff can make it far more affordable to run. The government’s Energy Rating website is a fantastic resource for comparing efficiency.
How Dux compares to gas models
Dux also offers excellent gas systems — both storage and continuous flow.
Pros of gas:
- Lower running costs (if connected to natural gas)
- Endless hot water with continuous flow
- Smaller units (great for compact homes)
Cons:
- Requires a gas connection
- More involved installation if upgrading from electric
I usually recommend gas for homes already connected — but for fully electric households, an efficient storage unit or heat pump often makes more sense.
What about heat pumps?
One of the most exciting options is the Dux heat pump — a smart alternative to traditional systems.
Benefits of heat pumps:
✅ Super energy-efficient (can cut energy use by up to 65%)
✅ Works well with solar PV
✅ Eligible for many rebates
Heat pumps extract heat from the air to heat your water, like a reverse fridge. They do cost more upfront, but the savings on energy bills can be significant over time.
I often recommend heat pumps to eco-conscious buyers or anyone looking to future-proof their home as energy prices rise.
Factors to consider when choosing
If you’re trying to decide between Dux models, here are some key questions to ask:
✅ How big is your household? Larger families = bigger tank or continuous flow system.
✅ What’s your energy source?
- Natural gas = gas unit
- Electric-only = efficient storage or heat pump
- Solar PV = pair with heat pump for max savings
✅ What space do you have? Storage tanks need more room; continuous flow units or heat pumps can save space.
✅ What’s your budget? Heat pumps have higher upfront costs but long-term savings; electric storage is cheapest upfront, but can be more expensive to run.
What about reviews?
If you’re doing your homework, looking for a good Dux hot water system review is a smart move.
Many online reviews highlight:
✅ Great reliability and performance
✅ Helpful warranty service from Dux
✅ Good availability of spare parts
Of course, no system is perfect — installation quality matters hugely. Always work with a licensed, experienced plumber to ensure proper setup.
Final tips for buyers
Here are a few extra tips I share with clients:
- Ask your plumber about current rebates — these change often
- Check if your home’s wiring or plumbing needs upgrades
- Plan — replacing an old unit before it fails gives you more choice
- Think long-term — a more efficient unit may save you thousands over its lifespan
Final thoughts
Choosing the right Dux hot water system doesn’t have to be complicated — it just comes down to matching the system to your household’s needs.
If you’re after a “set and forget” option for a large family, the Dux 400L electric storage is a proven choice. If energy efficiency is a priority, a heat pump or a gas continuous flow unit could be better.
And remember — it’s not just about the unit. Good installation and maintenance will make a big difference to performance and longevity.
Whatever you choose, Dux offers excellent quality, and with the right setup, your new hot water system should keep your home comfortable for years to come.