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Make Better Decisions About Water Storage

Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.

Buying a Tank6 min read

Different Types of Water Tanks

Steel, concrete, fibreglass and plastic tanks each behave differently once they are holding water. Here is how the four materials compare, and what to check before you choose one.

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Industrial5 min read

Tank Tops: Promax Transport Tanks

How a 1992 idea became a Kerikeri factory building complete tanker units: polyethylene transport tanks in more than 40 sizes, galvanised skid frames, dust suppression spray systems and ball baffles.

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Buying a Tank5 min read

7 Risks With Buying a Cheap Rainwater Tank

Poly rainwater tank prices vary widely, and a cheap tank is cheap for a reason. The saving usually comes out of the design, the raw materials, the fittings or the warranty.

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Buying a Tank4 min read

ENDURO vs XPRESS

ENDURO tanks have corrugated sidewalls and can be inset up to 1 metre in the ground; XPRESS tanks are smooth-walled, come in two colours and carry a budget-friendly price. Both are built to AS/NZS 4766.

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Buying a Tank5 min read

Ten Reasons to Purchase a Promax ENDURO Water Tank

The Promax ENDURO is a one-piece corrugated tank carrying a 20 year warranty, available in seven colours, and rated to be buried up to 1 m without losing that warranty. Here is what the range gives you.

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Poly Tanks4 min read

Which is the strongest water tank?

The Promax corrugated ENDURO is the strongest New Zealand-made plastic water tank. Continuous sidewall corrugation and one-piece moulded construction let it be buried up to a metre and back-filled against, with a full guarantee of 20 years.

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Concrete vs Plastic5 min read

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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Buying a Tank6 min read

Not all poly tanks are made equal

Two poly tanks can hold the same litres and look much alike from the driveway. Ten reasons a Promax rainwater tank is not the same tank as the cheaper one beside it.

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Guides4 min read

How To Check Water Levels In A Poly Water Tank

Knowing how much water is in your tank tells you when to top up, how freely you can use it, and whether your pipework is leaking. Here is why it matters and the two ways to measure it.

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Guides4 min read

Are poly water tanks safe?

Polyethylene is inert and does not react with water, so a poly tank does not leach into what it stores. Here is what that means in practice, and why water from a poly tank tastes different to water from concrete.

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Guides4 min read

MBIE Determination Allows Poly Water Tanks on Boundaries Without Setback

MBIE determined that a stormwater tank near a property boundary is not required to comply with Building Code clauses C3.6 and C3.7. Here is what the determination says, and the council planning rules it does not override.

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