Rheem vs Dux vs Rinnai: Which Hot Water System Suits Your Home in Australia
No one likes it when their hot water system lets them down, especially in the middle of winter. That’s why it pays to take your time when choosing a new system and find an option that suits your household and budget.
In Australia, there are plenty of established brands with extensive product ranges, which can be overwhelming for homeowners.
In this guide, AJB Plumbing compares Rheem vs Dux vs Rinnai hot water systems, looking at what each brand offers so that you can make an informed decision.
Rheem Hot Water Systems
Rheem has been manufacturing water heaters in Australia since 1939, giving the brand more than 85 years of local experience.
Over the decades, its range has expanded considerably and now includes electric, gas, solar and heat pump options. Rheem also manufactures many of its water heater tanks locally at facilities in Sydney and Melbourne.
Dux Hot Water Systems
Dux has an even longer Australian history, with the brand dating back to 1915. Today, its electric, gas storage, solar and heat pump water heaters are manufactured at a facility in the Southern Highlands of NSW.
Dux is also part of the Noritz Group, a Japanese company specialising in residential and commercial water heating technology.
Rinnai Hot Water Systems
Rinnai Australia was established in 1971 and focused on heating equipment before it began selling instantaneous gas water heaters in Australia in 1991. The brand helped pave the way for continuous-flow technology in a market traditionally dominated by electric storage systems.
Today, Rinnai offers a broad range of hot water and home comfort products across the Australian market.
Rheem vs Dux vs Rinnai: Which Hot Water System Suits Your Home?
The right brand depends on more than the name on the unit. Your household size, available energy source, hot water usage, installation space and preference for storage or continuous-flow hot water can all influence which system is suitable.
| Brand | May Suit Households Looking For | Options Available |
| Rheem | A broad choice across different household sizes, energy sources and system types | Electric, gas, solar, continuous flow and heat pump |
| Dux | Households considering continuous-flow hot water, with other system types also available | Electric storage, gas storage, continuous flow, solar and heat pump |
| Rinnai | Homes interested in continuous-flow hot water, while still having access to other system types | Gas and electric continuous flow, solar, heat pump and storage |
What Should You Consider Before Choosing?
Rather than choosing a hot water system based on brand alone, consider how your household actually uses hot water. A larger family with several bathrooms may have very different requirements from a couple living in a smaller home.
Think about:
- Household size and hot water demand – how many people regularly use hot water and whether showers, taps and appliances are often used at the same time.
- Energy source – whether your property has access to gas, electricity or suitable conditions for a heat pump or solar system.
- Available space – storage tanks require sufficient installation space, while continuous-flow systems have different installation requirements.
- Running costs and efficiency – the purchase price is only one consideration, so compare expected energy use and ongoing costs.
- Existing plumbing – replacing a system with a different type may require changes to plumbing, gas or electrical connections.
An experienced plumber can assess these factors and recommend an appropriately sized system rather than simply selecting one brand over another.
Comparing Rheem vs Dux vs Rinnai hot water systems is a useful starting point, but the right choice depends on your home and how your household uses hot water. Contact AJB Plumbing for help comparing suitable brands, system types and capacities for your property.