Kingspan Water Hints & Tips

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The benefits of installing a Kingspan Water rainwater tank are plentiful, irrespective if you live in the tropics, city, country, or drought prone areas. You can make big cost savings by reducing consumption of mains water and connecting your rainwater tank to taps, garden, toilet, washing machine and hot water system.

Our made-to-last steel tanks have a 20-year anti-corrosion warranty plus 10-year construction warranty.

To make installation simple, our easy instructions will get you started. For help, Ask an Expert.

A few simple regular low-key maintenance tasks will keep your tank clean and trouble-free.


Installation & Care

Read our easy-to-install guide to connect up your water tank and for maintenance steps.

Installing Your Tank

Follow this simple guide to easily connect up your Kingspan Water Rainwater Tank.


In most cases, tank installations use PVC storm-water pipes to carry rainwater from the gutter to the tank inlet (see dry system diagram). Connecting the PVC pipe is hassle-free, and it should be glued with watertight cement. PVC pipes are inexpensive and neat and can be painted to match the colour of your home.  Alternatively high-density polyethylene (HDPE) pipe may be used.

The downpipe should be directed to run downwards and the rainwater should flow into the top of the tank. There should be enough fall in the pipe to allow gravity to drain water into the tank inlet.

A first flush water diverter and/or a rain head can be used to keep sediment and leaves out of the tank. Called a dry system, the pipes are allowed to dry out once rain stops.


A wet system (see diagram), where water remains in the pipes after rain, connects one or more underground downpipes and carries water through an underground pipe to the tank. Wet systems rely on hydraulic head pressure to force water through sealed pipes and up into the tank inlet.

A wet system is useful for a larger roof catchment area, as the tank does not need to be located near the downpipe.  It is imperative to consider the height differential between the bottom of the gutter and the top of the tank. Allow at least 500mm differential. Ask an Expert for more information about wet systems.

An important consideration is to use a filter before water enters the underground storm-water pipes. We recommend installing a first flush or a High-Flow Filter and/or Rain Head under the gutter. Inspection points should also be installed to allow a flush out, if required. Gutter guards are effective for keeping your wet system free flowing.

Caring For Your Tank

Well-designed systems, like Kingspan Water tanks, are low maintenance. All rainwater systems need to be monitored to ensure your drinking water is safe for your health and for the tank’s longevity.

With a regular low-key monitoring and maintenance plan you will generally prevent problems occurring.

Your Kingspan Water tank is made from strong steel and internal polymer coating, and is not susceptible to UV radiation, making it long lasting.

Regular maintenance is simple. We recommend you fully inspect your tank at least every 3 months.

  • Inlet screen should be clean, free of leaves and debris
  • Clean gutters regularly, ensure water does not stagnate in gutters as this causes algae blooms
  • Clean the first flush water diverter regularly
  • Inspect your tank regularly to ensure mosquito screens and light guards are working effectively.

Kingspan Water recommends that a full flush of all the tank water should be completed every 3-5 years.

Algae or smelly water should be always be treated to ensure it is safe to drink. We recommend Davey Aquasafe Liquid Solution. In severe cases, completely flush the tank or use a professional tank cleaner to service your tank.

Learn more

Rainwater Harvesting Systems

A well-designed rainwater harvesting system can save up to 40% of water over normal household mains water consumption, making it cost-effective and saves precious water.

It is mandatory, in some states of Australia, to install rainwater tanks to supply toilet flushing, bathing, garden watering and washing machine for all new homes or renovations.

If this is applicable in your area, we recommend a mains water backup controller for seamless switching to mains water when tank water is exhausted or for power failures. These automated backup devices allow uninterrupted access to water.

Learn more

Tank Base Preparation

These guidelines for Base Preparation will ensure a correct foundation for your rainwater tank. Damage to your tank due to failure or movement of the tank base is not covered by the warranty.  Please bear in mind the weight of water: 1,000 litres weighs 1,000kg, so soft ground can subside under the weight of a full tank.

The base of your tank is made with double-sided Aquaplate® (in- and outside of the tank base is coated with polymer film to prevent corrosion). The tank can be in direct contact with the tank base yet will not corrode; therefore, it is not necessary to elevate the tank above ground level.

Tank Base Preparation

Installing Garden Beds

Kingspan Water’s garden beds are a convenient and elegant solution to creating new landscaping features; they are easily maintained spaces to grow a variety of vegetables and herbs for your home.

This quick guide explains how to prepare your garden bed for use.  If you have questions, please Ask an Expert for more details.

For garden beds positioned on a lawn or garden, we recommend digging in the first couple of corrugations for stability. To obtain your optimal finished height, add approx. 15cm extra height to the overall bed height when you place your order.

Fill the first 2/3 of the bed with material suitable for drainage, e.g. gravel, brick, sandstone, broken terracotta pipes or roof tiles. A good idea is to use upturned polystyrene boxes to fill to bottom of tall garden beds.

Once the drainage material has been added, lay a bed of straw. On the top of the straw, add topsoil and organic material to the pile: manures, raw fruits and vegetables, coffee grounds, raw eggs, newspaper, more straw, topsoil, and other organic material.

It is advisable to keep this pile covered and away from pets, until it is properly decomposed.  Turn the material regularly with a pitchfork. Once all material turns into compost, your bed is ready for planting.

Frequently Asked Questions

What is the difference between steel and plastic water tanks?

There are a number of important differences between steel and plastic (polyethylene) water tanks:

  • Steel water tanks are 100% UV-proof. This means they will not degrade in sunlight. Plastic water tanks (polyethylene) are affected by ultraviolet light and will break down over time.
  • Steel water tanks can be built to most dimensions, so your tank can fit perfectly in any available space, maximizing the amount of rainwater you can harvest.  Plastic water tanks are only made in a small range of sizes.
  • The strength of steel water tanks means they will not bulge or stretch when full of water. As a result, our Slimline tanks use considerably less space on your property than plastic tanks.
  • Steel is the most environmentally friendly material for water tanks. Not only are they fully recyclable, but also the environmental impact of steel water tank production is less than tanks made from any other material.
  • Steel water tanks offer an aesthetic alternative to plastic. The iconic steel water tank is often specified by architects to add a design element to new homes and renovations. They are also available in a range of Colorbond® colours.
What size water tank should I install?

The general rule is to install as large a tank as possible. The bigger the tank, the less it costs per litre of water harvested. The optimum size of a water tank is governed by a number of factors:

  • Available space on your property.  This includes any restrictions to site access like fences, retaining walls, trees, air conditioning units, etc.
  • Intended use of the harvested rainwater. When used as a complementary water source (where the property is also serviced by mains water) it is important to consider the intended use of the harvested rainwater. A lot more water is required for watering lawns and gardens and topping up pools than for flushing toilets and filling washing machines (see “Cycle of Usage” notes below).
  • Size of the catchment area. This refers to the total roof space used to catch rainwater.  As roofs are generally comprised of sections, the catchment area is determined by the roof sections that service the downpipes directed to the water tank. The larger the catchment area, the smaller the water tank that is required, as it will fill more often.

Cycle of Usage
This refers to how often the harvested water in a rainwater tank is used and replenished by rain events. The most efficient use of rainwater, from a conservation perspective, is to use it as a complementary water source for flushing toilets and filling washing machines. This can account for a large portion of water usage inside your home.

By using rainwater in this way, your water tank is frequently being depleted, then topped up each time it rains. If rainwater is used infrequently, it will just overflow to the stormwater drain at each rain event.

How much water can I catch?

The size of the catchment area will determine the amount of rainwater harvested with each rain event.  One millimetre of rain will harvest 1 litre of rainwater for every 1 square meter of catchment area (roof space).

For example, if you have a catchment area of 50 square meters, you will catch 500 litres of rainwater whenever you receive 10mm of rain.  (Keep in mind we generally experience about 10-20% loss; so it might actually be about 400 litres per 10mm of rain).

Where is the best place to put a water tank?

This is governed by a number of factors:

  • Slope of the site. The most suitable site will be on level ground, away from retaining walls. Extra installation expense may be incurred if your site needs to be excavated to make a level foundation.
  • Downpipe location. You should aim to connect as many downpipes to feed your tank as is practical. The closer the water tank is to your downpipes, the more efficient the water harvesting system will be. If downpipes need to be diverted and run horizontally over long distances then the installation expense will increase and the efficiency of the system may be compromised.
  • Aesthetics.  While a well-positioned water tank can add a design element to your home, most people are not likely to install a water tank where it is highly visible. This is an important consideration.
  • Proximity to laundry or toilets. Where a water tank is used to feed a toilet or washing machine, a licensed plumber must install it. Again, the shorter the run of pipe work from the tank site to the internal appliance, the less expense will be incurred in installation.
What kind of base does the water tank need?

Concrete Slab- The most appropriate base for a water tank is a concrete slab.  Ideally, this would be a minimum of 100mm in depth and 100mm larger than the width and length (or diameter) of the water tank.  Reinforcing steel mesh should be used in the slab.

Crusher Dust- Another method of constructing a base is with pre-cast concrete slabs on a bed of crusher dust.  It is a good idea to seal the crusher dust in with concrete pointing or treated pine railings so it doesn’t wash away.

Compacted crusher dust bases can be used for round water tanks. The crusher dust should be retained to prevent erosion.  Over time, it may be necessary to augment a crusher dust base.

Tankworks Stands– Kingspan Water has a range of made-to-measure stands to suit tanks up to 5000L capacity.  Kingspan Water stands are made from heavy gauge steel tube and are engineered to support the large mass of a full water tank.

You can find more detail about Tank Base Preparation here.

Can I drink the water from my water tank?

Wherever there is a town supply of mains water, it is not recommended that you drink the water from your tank.

Kingspan Water tanks are made from a food-grade AS4020 certified material, so they can be used for storage of potable water. There are filtration devices available that can help to safeguard your tank water is safer for drinking. Please Ask an Expert if you have more specific questions about water filtration.

Do Kingspan Tankworks tanks comply with BAL (Bushfire Attack Level) rated properties?

Yes. Kingspan Water steel tanks comply with any of the BAL rated properties.  Capacities and connections will vary depending on the property size and reticulated mains water available in construction areas

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