Shapes, styles and materials

This page will help you if you'd like to know a little more about:

Styles of tank available Advantages of different shapes of tank
Features of different water tank materials What are the tanks made of?

If you already have a good idea of what kind of water tank you need, see the list of our shapes and sizes of poly and steel tanks

If you need any help along the way, just ask us for advice.

Styles of tank available

    Advantages   Disadvantages

  • Most cost effective - around 1/2 the price of a slimline for the same volume
  • Can fit into unused corners
  • Full range of diameters from 90cm to 15 metres
  • Will always get 'dead' areas behind
  • Often insufficient room to get a large round tank round to the back of an established house

Slimline or 'Under Eaves'
  • Best fit for most urban homes and the most popular in larger sizes
  • Different widths available for narrow spaces
  • Can be very slim - down to 260mm!
  • Can go flat against a fence or wall
  • Custom-made steel slimline tanks up to 7000L capacity with the width and length you want
  • Mid-range price
  • Poly slimlines only up to 3000L in WA – for more capacity join two together
  • Very slim tanks are a premium product

  • Good for low spaces such as under decks
  • Larger sizes competitive with slimline tanks
  • Whole tank base must be level
  • Can’t go over 600mm high, so greater volume means very long, or wide
  • 3000L bladder would be 5500 x 1100mm
  • Timber decks often don't have wide enough spans

  • Gets the tank out of sight
  • Good water quality from being cool & dark
  • Low profile tanks easy to install in sandy soils
  • Water filtration is straightforward
  • Does cost significantly more for both tank and installation - around twice the price of an above-ground slimline 
  • Ideally installed when building new home

What are the tanks made of?

Material    Key Features    Material    Colours Warranty

Plastic "Poly"
  • Range of shapes
  • Biggest range of sizes
  • Lightweight
  • Easy to install
  • Can sit on sand or paving
  • Underground options
  • Food-grade polyethylene approved to AS 4020 for drinking water.
  • One piece design with no seams
  • UV resistant
  • Up to 27 colours available for same cost depending on manufacturer
10 years

Steel "Aquaplate"
  • Custom made to required size
  • Traditional look
  • Lightweight
  • Must sit on concrete pad
  • Corrugated steel with a plastic coating laminated to the inside to prevent corrosion
  • Also made to AS 4020
  • Plain zincalume
  • Pale green or cream Colorbond
  • Any spray painted colour
20 years

Plastic bladder
  • Good for long, wide & low spaces out of direct sunlight– e.g. under a deck
  • TPU or PVC sheet, welded
  • Also made to AS 4020
  10 years

Large steel
  • Curved steel sections bolt together into a ring
  • Plastic liner inside retains the water
  • Easy to get onto site
  • Quick to construct
  • Thick PVC sheet, welded
  • Also made to AS 4020
  • Zincalume
  • 5 Colorbond
20 years Liner 10 yrs

  • Precast, or poured in-situ
  • Fireproof
  • Often cracks or leaks slightly over time
  • Best for large underground tanks
  • Concrete or ferro-cement
  10 years

All tanks are made to the same Australian Standard AS4020 for products in contact with drinking water. Plastic tanks also meet AS2070 for food contact.

Rainwater tends to be slightly acidic, and you may notice this whatever material your tank is made from. New rainwater tanks can impart specific tastes and odours that may be noticeable but are not harmful. For example, PVC liners can impart a plastic taste when first used, due to the plasticiser.
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