
Both types of tanks have their place in the market, but if you’re investing in long-term water storage, it’s important to understand the key differences between steel and plastic water tanks.
In this article, we’ll compare the two options across important categories like durability, cost, safety, environmental impact, and more—so you can make the best choice for your needs.
1. Durability and Strength
Steel Tanks: Built to Last
Steel water tanks—especially galvanized or stainless steel models—are known for their exceptional strength and structural integrity. They’re built to withstand harsh weather, extreme temperatures, and mechanical damage far better than plastic tanks.
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Lifespan: 20 to 35+ years with proper maintenance
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Fire-resistant: Steel doesn’t melt or warp in high heat, making it ideal for bushfire-prone areas
Plastic Tanks: Prone to Degradation
Plastic (polyethylene) tanks are lighter and easier to transport but are more susceptible to damage:
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UV degradation from prolonged sun exposure
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Cracking in extreme cold or if improperly installed
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Melting or deformation in fire situations
2. Water Quality & Safety
Steel Tanks: Ideal for Potable Water
The Stainless steel tanks, in particular, are non-reactive and hygienic, making them excellent for storing drinking water. Even galvanized tanks can be lined with food-grade coatings to ensure water safety.
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No plastic taste or chemical leaching
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Resistant to algae growth (especially when sealed properly)
Plastic Tanks: Risk of Chemical Leaching
Plastic tanks are generally safe for potable water if they meet Australian standards (e.g., AS/NZS 4020). However, over time:
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Heat and UV can cause plastic to degrade
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Chemicals like BPA (in older or low-quality tanks) may leach into the water
3. Cost and Affordability
Steel Tanks: Higher Upfront, Lower Long-Term Cost
Steel tanks typically cost more upfront than plastic, especially for stainless steel models. However, their longer lifespan and lower maintenance often make them more cost-effective over time.
Plastic Tanks: Budget-Friendly
Plastic tanks are more affordable initially and are great for small-scale projects, temporary setups, or tight budgets.
4. Fire Resistance
Steel Tanks: Superior in Fire Zones
In bushfire-prone regions, fire authorities often recommend steel tanks. When exposed to high heat or direct flame, steel retains its shape and can continue supplying water for firefighting.
Plastic Tanks: Vulnerable in Fires
Plastic tanks melt quickly, sometimes before flames even reach them. This can cause the tank to collapse, losing all stored water when it’s needed most.
5. Environmental Impact
Steel Tanks: Sustainable and Recyclable
Steel is one of the most eco-friendly building materials. It’s:
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100% recyclable at the end of its life
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Often made with recycled content
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More durable, which reduces the need for replacement
Plastic Tanks: Less Eco-Friendly
While plastic tanks can be recycled, the process is less efficient. Plus, plastic production is energy-intensive and contributes to pollution.
6. Design Flexibility & Aesthetics
Steel Tanks: Sleek and Customizable
Steel tanks—especially those from Platinum Water Tank—can be custom-designed to suit your property's look. They’re available in a range of shapes, sizes, and Colorbond finishes.
Plastic Tanks: Variety of Shapes and Colours
Plastic tanks also come in various colours and can be molded into different shapes, including slimline tanks for small spaces.
7. Maintenance Requirements
Steel Tanks: Minimal but Important
Steel tanks require occasional checks for rust (especially galvanized models) and inspection of internal liners, if fitted. Stainless steel tanks require very little maintenance.
Plastic Tanks: Low Maintenance
Plastic tanks require minimal upkeep—mostly checking for leaks and cleaning out sediment every few years.
Why Platinum Water Tank Recommends Steel Tanks
At Platinum Water Tank, we supply both steel and plastic tanks to suit a wide range of customer needs. However, we strongly recommend steel water tanks for most long-term applications due to their:
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Superior strength and lifespan
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Excellent water quality
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Better performance in extreme conditions
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Eco-friendly and recyclable design
Our custom-made steel tanks are manufactured to the highest standards using quality Australian materials. Whether you need a tank for your home, farm, commercial site, or industrial facility, we can help design the perfect solution.
Final Verdict: Are Steel Tanks Better Than Plastic?
Feature | Steel Tanks | Plastic Tanks |
---|---|---|
Durability | ✅✅✅ | ✅ |
Water Safety | ✅✅✅ | ✅ |
Fire Resistance | ✅✅✅ | ❌ |
Cost (Upfront) | ❌ | ✅✅✅ |
Long-Term Value | ✅✅✅ | ✅ |
Environmental Impact | ✅✅✅ | ❌ |
Maintenance | ✅✅ | ✅✅ |
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