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Electric hot water systems
Electric hot water systems offer an economical and dependable option for households, ensuring a steady flow of hot water. Nambour Hot Water provides straightforward, efficient electric hot water installations and repairs with reliable, consistent service.
Electric hot water systems
Electric hot water units remain the predominant choice in Australian households and have been produced domestically for more than a century. Although the basic design is much the same, contemporary models use better materials and thicker, more compact insulation around their storage cylinders. This reduces heat loss and boosts efficiency compared with units made before 2000.
These units work similarly to a kettle by using a heating element, and in Queensland they commonly come in three power ratings: 1.8kW, 2.4kW and 3.6kW (with occasional 4.8kW units in limited areas due to higher supply needs). The same ratings apply across major manufacturers such as Rheem, Dux, Vulcan, AquaMAX and Rinnai.
Bear in mind that different element wattages don’t alter the overall energy rating. For example, a 1.8kW element uses half the power of a 3.6kW element but requires roughly twice the time to bring the same volume of water to the same temperature.
Electric hot water systems are generally built with mild steel tanks coated internally with vitreous enamel and safeguarded by a sacrificial anode. There are stainless steel models available too, while the older copper-style heaters are no longer manufactured.
Nambour Hot Water supplies and installs dependable electric hot water systems for every household requirement, and our Nambour plumber team handles installation, repairs and service for gas and electric systems.
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An electric hot water system
An electric hot water system can make up roughly one-third of your electricity costs if you don’t have solar PV exporting to the grid. On tariff 11, which supplies power at the standard rate 24 hours a day for general power and lighting, running costs are higher. Systems on tariff 33 receive power for about 18 hours each day, commonly switching off between 6–9am and 6–9pm. Tariff 31 is the lowest-cost option, supplying electricity during off-peak periods, usually from about 9pm to 6am.
Bear in mind that tariff 31 is typically unsuitable for hot water cylinders under 250 litres when the household has two or more occupants.
Electric hot water units come in many storage sizes, from compact 25-litre units for kitchens and single basins through to 400-litre tanks for larger homes. The guide below outlines common tank sizes and suitable household use (actual needs will vary by usage):
50L & 80L: Best for 1–2 people in small units. These sizes generally operate only on tariff 11 and aren’t suitable for off-peak tariffs.
125L: Suits 2–3 people in a unit or small townhouse when on tariff 33.
160L: Suits 2–4 people in a unit or small townhouse when on tariff 33.
250L: Suitable for 2–4 people on tariff 31 in most three-bedroom homes, and can serve up to 6 people on tariff 33.
315L: Good for 3–5 people on tariff 31, or up to 7 people on tariff 33.
400L: Ideal for 4–7 people on tariff 31, up to 9 people on tariff 33, and as many as 12 people on tariff 11.
Nambour Hot Water can assist you in selecting the right hot water system and tariff arrangement to deliver dependable hot water while managing your energy bills — contact your local Nambour plumber for installations, repairs and advice on gas and electric hot water systems.
Rheem
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Rheem is one of the best-known names in hot water, recognised worldwide for quality and supported by one of the industry’s largest marketing programs.
In Australia, Rheem produces a broad selection of electric hot water systems:
Mild steel vitreous enamel (VE) models are manufactured in Sydney
Stainless steel units are produced in Melbourne, at the former AquaMAX facility
Under the Rheem umbrella you’ll also find other prominent domestic hot water brands such as AquaMAX, Vulcan and Solahart.
Warranty periods vary from 5 to 12 years depending on the unit’s size and construction. To maintain warranty eligibility and prolong the life of your hot water tank, servicing is necessary at least every 5 years. This service should include replacing the sacrificial anode on vitreous enamel tanks, and it’s recommended to replace the pressure and temperature relief valve while servicing.
At Nambour Hot Water, we suggest Rheem systems for their proven reliability, wide product range and the confidence that comes with one of the most respected names in hot water.
AquaMAX
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The AquaMAX brand has been established since 1988; it remained family-owned until Rheem acquired it in 2009, by which time AquaMAX had sold more than 500,000 electric hot water units.
AquaMAX has long been recognised in the industry for reliable quality, particularly for its stainless steel hot water products.
Their stainless steel cylinders continue to be manufactured in Victoria, while the mild steel VE electric hot water range is produced at Rheem’s Sydney facility.
AquaMAX hot water systems are supplied with warranties ranging from 7 to 10 years depending on the cylinder capacity — smaller tanks carry shorter warranty periods.
A service is recommended before five years of use, notably to replace the sacrificial anode, which helps extend the life of the tank.
Vulcan
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Vulcan is a well-regarded hot water marque produced by Rheem. Positioned as Rheem’s economical line, Vulcan delivers solid performance without a high price tag. Vulcan’s electric storage units use mild steel with a vitreous enamel coating, engineered to provide reliable hot water for Australian households. Warranty: 7 years for the 50L electric storage model; 10 years for sizes from 80L up to 400L. To prolong the life of the cylinder, replace the sacrificial anode between years four and five of operation. This routine service helps prevent corrosion and keeps the unit performing at its best. At Nambour Hot Water, we endorse Vulcan hot water systems as a budget-smart option, supported by Rheem’s manufacturing quality.
Rinnai
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Rinnai has long been acknowledged as a frontrunner in the gas hot water market. Historically, some of their electric hot water units were imported from China or built by Dux in NSW, but Rinnai now operates its own manufacturing facility in Victoria, producing Hotflo electric hot water systems locally.
The Rinnai electric lineup ranges from compact 25-litre models (perfect for kitchenettes or tight spaces) up to 400-litre tanks suited to larger homes. Warranty: 7 years for 25L and 50L units, and 10 years on all larger models. Note: to keep the warranty valid, a service is required every five years (or earlier). At Nambour Hot Water, our team supplies and endorses Rinnai systems for their dependable performance, energy efficiency, and the reassurance of Australian-made quality.
Dux
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Dux has been a recognised name in Australian hot water for over a century. Although the company is no longer Australian-owned, it still manufactures dependable systems built to suit local conditions. All Dux electric hot water units use mild steel cylinders with a vitreous enamel lining, providing long-lasting performance for homes of every size. Most models are produced in Moss Vale, NSW, and tank capacities span from compact 25-litre units up to 400-litre systems. Warranty periods depend on capacity: 7 years on the cylinders of 25L and 50L models, and 10 years on larger sizes. At Nambour Hot Water, we trust Dux heaters for their consistent reliability and stock a broad selection so you can get the right hot water system, installation or repairs promptly from your local Nambour plumber.
Thermann
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Thermann is an exclusive brand sold through the Reece Plumbing Supplies network, with their electric hot water units produced by Dux. Built from mild steel and finished inside with a vitreous enamel coating, Thermann cylinders include a sacrificial anode to guard against corrosion. That anode should be replaced within five years to help the unit reach its expected service life. Thermann electric models carry the same warranty terms as the Dux Proflo lineup: seven years for 25L and 50L models, and ten years for larger capacities. At Nambour Hot Water, we regard Thermann hot water systems highly for their consistent reliability and strong performance.
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