Buying the right water tank
Size, budget, site, material, maintenance and consent: the pieces of the tank buying puzzle, and how to weigh each one before you order.
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Articles | Knowledge Hub
Make Better Decisions About Water Storage
Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.
What type of Water Storage Tank is best - Concrete or Plastic?
Concrete tanks can be buried and keep water cooler; plastic tanks cost less, take new outlets easily and flex in an earthquake. Here is the honest comparison, including where concrete wins.
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What is The Difference Between A Detention Tank And A Retention Tank?
A detention tank and a retention tank look identical and are both stormwater tanks. A detention tank slowly releases water to the stormwater network; a retention tank holds it for you to use.
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The Truth About Concrete Tanks
Concrete water tanks are sold on four claims: that they are cheap, strong, keep water pure and are easy to clean. Each one is worth testing before you buy on reputation.
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Do I Need A Consent For A Water Tank?
Only the council in your region can tell you whether your tank needs building or resource consent. Rules differ from district to district and change often, so make the council your first call.
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Dual Purpose Tanks
A dual-purpose tank detains stormwater in its top section and retains water for reuse in the bottom, so the same tank that satisfies the council also feeds the laundry, the toilets and the outside taps.
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The Critical Role of Fire Service Kits
A fire service kit is the connection between your tank and a firefighting hose. This covers what a kit contains, how the standard, dual and buried-tank versions differ, and the FENZ access rules that apply once it is installed.
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What Size Water Tank Do I Need?
No one has ever complained that their water tank is too big. Here is how budget, footprint and council rules shape the answer, and why you should round up.
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Water Restrictions: Causes, Impacts and Solutions
Water restrictions are now normal across most of New Zealand. What is driving them, how they change life on farms and in cities, and what storing rain does about it.
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Selecting the best base for your water tank
Sand, fine gravel and crusher dust compact well and cost least. Concrete suits smaller tanks. Whichever you choose, the base is part of the installation instructions, and following them is what keeps the warranty intact.
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Explore Our Range
Shop Popular Categories
Browse Promax tank categories for residential, rural, commercial, and specialised applications.
Water Tanks
Reliable Storage
Water Tanks
Durable above-ground water tanks for rural, residential, and commercial storage.
Underground Tanks
Space Saving
Underground Tanks
Underground water storage for sites where space, access, or visibility matters.
Slimline Tanks
Built for Tight Spaces
Slimline Tanks
Narrow-profile tanks designed for homes, boundaries, and other restricted spaces.
Industrial Tanks
Heavy Duty Solutions
Industrial Tanks
Specialised tanks for demanding commercial, industrial, and process applications.