Frequently Asked Questions

Answers to the Questions We Get Asked Most Often
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Frequently Ask Questions

Below is a full list of our most asked questions about water tanks, materials, costs, rainwater harvesting and the environment.


Q1:Should I install a rainwater tank?

Installing a rainwater tank can save large amounts of water for your home or garden. Some of the benefits to getting a water tank installed can include:

  • saving money on water bills
  • less reliance on mains water supplies
  • catching rainwater so less goes down the drains – this helps to prevent flooding
  • a gorgeously green garden year-round, without worrying about water restrictions

A rainwater tank is an investment so make sure you do some research and planning before you make the leap. For example:

  • Will you be drinking the water? If so, we highly recommend our Stainless Steel Water Tanks as they provide cleaner water Stainless Steel is the choice of Australia’s world class food processing, catering, and medical industries as it is an inert material that is easy to clean and maintain. Stainless Steel will not taint the taste of your water nor leach any foreign chemicals.
  • What’s your budget, and how flexible is that figure? Cheaper water tanks are made of materials that degrade faster, so spending a little more can be an investment over the years.
  • Is recyclability a priority? Steel tanks are usually fully recyclable, whereas poly (plastic) tanks often degrade into a condition where they have little recycling value.
  • Round or slimline water tank? Slimline water tanks are becoming increasingly popular for their more aesthetic look; they are mounted to the side of your property. Round water tanks have the classic, traditional look, and with the right coat of paint or a cool mural, they can be a real backyard feature).

Q2:Is Rainwater Harvesting worth it?

Rainwater Harvesting is the process of collecting rainwater from surfaces typically roofs in Australia into Rainwater Tanks, and subsequently storing the water for later use and is now considered a major strategy for water conservation in Australia. Investing into Rainwater harvesting will not only save you money, provide you with water during droughts it will also help the environment.

The amount of water you can harvest for your home or business depends on your Rainwater Catchment area (Roof) and the amount of rainfall in year on your area.

For more information check out our article on: Are Rainwater Tanks Worth it? You can also work out how much Rainwater you can potentially harvest with our Rainwater Harvesting Calculator

Q3:I live in a city can I still harvest rainwater?

Yes, more and more city dwellers are adopting attractive, space-saving slimline water tanks that can easily fit in a backyard and make a significant dent in the water bills of the average Aussie family. Rather than being round, they are rectangular, meaning the same capacity with less wasted space.

Q4:Is the cost of stainless-steel tanks much higher than for other tanks?

On average, round stainless-steel tanks made from Premium grade 304 stainless steel are approximately $500 to $1000 more than the equivalent tanks made from Colorbond. For example, a 10,000-litre round tank made from stainless steel is approximately $1600 whereas a similar one made from Colorbond is approximately $1000.

The price differential is slightly more for slimline tanks because of the inclusion of internal stainless-steel rods to strengthen the slimline shape of the tanks. The price differential is also greater if Marine grade 316 stainless steel is used to construct the tanks. See our example price lists and contact our Office Manager for a quote.

Find more information on the cost and benefits of Stainless Steel Water Tanks

Q5:How do work out the size of tank I need?

Normally we recommend that you get the largest size tank you can suit your site. Round tanks can be made to much larger sizes whereas slimline tanks can be made specifically to fit neatly into a confined space. Deciding a size can be influenced by several factors. These include:

  • The number of people living in a house if it is for domestic use
  • The catchment area of the roof
  • The annual rainfall

Get more information on what size tank will best suit your requirements.

Q6:What are delivery costs and are delivery cost included in the price?

Yes, we can position your tank(s) on to a concrete slab, a crusher dust pad or a timber platform provided they are built correctly to fit the size of tank ordered. We can provide one or two men if needed but you will need to provide additional staff if the tank is very large, or it is a particularly difficult site to access. If a crane is needed, we can liaise with the crane company.

You can find out more information from our Site & Delivery Page

Q7:What fittings come with the tank?

Three fittings come with your tank. You will be asked where on each tank you want them. They are:

  • An inlet strainer which allows the water from your roof for example, into the tank, with protection from the sunlight and mosquitoes,
  • An overflow attachment which is a round plastic outlet which can be either 90 or 100mm in diameter and which come with mosquito proofing.
  • An outlet system which consists of a Ball value

 We also have a wide range of additional fittings we can provide. Get more information on the water tank outlet and additional fittings

Q8:Do you connect the tanks up?

No. We suggest you get a local plumber to connect them up. That way you have a local expert to make them compliant to local conditions.

Q9:How long does it take for the Tanks to Arrive?

It normally takes about three weeks to make your tank and have it ready for delivery. In very busy periods however, it can sometimes take up to 7 or 8 weeks to have your tank ready for delivery. Please check with our Office Manager the likely delivery time for your tank, given the current workload at the time of order.

Q10:How are tanks delivered?

Our usual delivery mode is on either a small truck, truck and trailer or 4WD UTE and trailer. The round tanks are rolled off onto mattresses which protect the tanks, whereas the slimline tanks are carried or put onto small trolleys for maneuvering and then depending on the site access being suitable, rolled or maneuvered close to the prepared tank base.

A geofabric cloth is put down onto the prepared base, then the tank is stood onto its bottom on the prepared base. The tank can then be moved around to the correct positioning.

Depending on the size of the tank some onsite assistance will be required. It is best to discuss any site complications or delivery queries when ordering your tank.

Q11:Where should my water tank be located?

Placement matters. Perhaps the most important thing to consider is that your tank is designed to collect water from a rooftop and deliver it to your water tank via a downpipe, so you can’t have it placed too far from the roof or the downpipes will end up ineffective (because the further they go, the less of an angle they’ll have, stopping gravity from doing its work in collecting the water – and if the downpipes are lower than the top of your water tank, that won’t work either). You also need to have enough space to place your water tank.

Round water tanks do tend to take up a lot of space; however, slimline tanks make the most of available space. They are generally mounted against the wall of your property or can act as a garden wall; some tanks can even be joined together to maximise your water storage.

You can also install a water tank underground, although this can be 2x the price of an above ground tank. Underground tanks also need to be made from stronger materials and structures and will often need weighting or concrete reinforcement. You will also need a pump, and possibly additional backflow prevention to avoid groundwater contamination and ensure compliance with state regulations: check with your Council.

Another option is Under deck water tanks which are great for when you have limited space and when you wish to locate your tank(s) in a place that does not take up valuable yard or garden space. Find out more about our Underdeck Water Tanks

Above ground tanks should be in shade, if possible, to keep the water temperature low while reducing bacteria growth and evaporation. They should also be on a level surface, so that your pump is not working against gravity.

If your house is on stumps or stilts (the classic “Queenslander” design) you could consider making the most of your available space by putting a tank underneath your house or beneath the decking.

Q12:When is the best time to install a water tank?

Ideally, you should install your water tank before the wet season begins, so that you can collect as much water as possible to use during the dry season.

Q13:Do the tanks meet Council Overlay requirements?

Yes, we can build the tanks to meet specific Council Overlay requirements.

Q14:Why are Slimline Water Tanks more expensive than round tanks?

A Slimline Water Tanks are a little more expensive than the equivalent Round Water Tanks. This is because the water pressure equalizes around the whole diameter of a Round Water Tank and there is no need for reinforcement around the sides of the tank.
With Slimline Water Tanks there is a need to reinforce the width of the Slimline Water Tanks with stainless steel rods to make sure the sides don’t expand and collapse under the additional pressure.

The additional costs come from the cost of the stainless steel rods themselves as well as the labor costs of fixing them to the sides of the tank.
In many instances this additional cost is considered worthwhile because Slimline Water Tanks can be located in prime positions such as along walls, along fences, under eaves or in narrow spaces where Round Tanks would not fit easily.

Slimline Water Tanks can be worked to fit into the design of a house and its surrounds.

Q15:What is the biggest Slimline Water Tank?

Currently the biggest Slimline Water Tanks is 1150mm wide, by 2350mm high by 4000mm long and this Slimline Water Tank will hold over 10,000 litres of water. Select Water Tanks can custom make your Slimline water tanks to suit your needs. They can range in size from 550mm to 1150mm wide, from 800mm to 2350mm high and from 1000mm to 4000mm long.

Our Slimline water tanks can be made from Stainless Steel or Colorbond. 

Q16:How much are Slimline Water Tanks?

Currently the biggest Slimline Water Tanks is 1150mm wide, by 2350mm high by 4000mm long and this Slimline Water Tank will hold over 10,000 litres of water. Select Water Tanks can custom make your Slimline water tanks to suit your needs. They can range in size from 550mm to 1150mm wide, from 800mm to 2350mm high and from 1000mm to 4000mm long.

Our Slimline water tanks can be made from Stainless Steel or Colorbond. 

Q17:Why Stainless Steel?

There are many reasons you should consider buying a stainless steel water tank. They include:

  • They come with a 30-year warranty for corrosion and so are cost-effective over time.
  • The minerals used in stainless steel are valuable and so can be recovered and recycled.
  • They are being designed into structures by builders and architects because they look good.
  • University research shows they hold their structural integrity during a bush fire.
  • Stainless steel keeps the water cool which helps reduce the growth of bacteria and algae.
  • Stainless steel does not leech impurities into the water which makes it hygienic to drink.

Find out more about our Stainless Steel Water Tanks.

Q18:What about Colorbond Water Tanks?

Colorbond steel tanks are slightly less expensive than ones made from stainless steel and they come in a range of colours to match or complement existing structures or colour schemes. These tanks come with a 20-year warranty for corrosion and a 10 year manufacturer’s warranty.  Like Stainless Steel research has shown, that they keep their structural integrity during a bush fire.

Find out more about our Colorbond Water Tanks

Q19:Which Tanks are resistant to bush fires?

Both our Stainless Steel and Colorbond Water Tanks offer resistance to bushfires in comparison to Plastic Water Tanks. Find out more about steel water tanks and bush fires.  

Q20:Can the tanks be made to be fire-fighting compliant?

Yes, we can fit the tanks with the required fittings to make them firefighting compliant, with a Storz fitting for NSW or the Camlock for Qld.

One particularly efficient tank we can build is where the normal outlet system is built a certain distance up the side of the tank so that you always have 10,000 litres in the bottom section of the tank in case of fires, while still using the water in the top of the tank for normal use.

 We also supply a range of next generation petrol driven Fire Fighting Pumps & Hose Kits

Q21:How do rainwater tanks work?

They work by storing rain when it falls. This is known as Rainwater Harvesting. The roof of a house is the most common catchment area. The gutters funnel the rainwater directly into the tank. For more information visit our page on how rainwater tanks work.

Q22:Do rainwater tanks need a pump?

No not all rainwater tanks need a pump. One way to get water from the tank is by relying on gravity.

The tank can be placed on a stand or on high ground and gravity will force the water down to where you want it. If you need the water to travel uphill from the tank or need the water to be at a certain pressure when coming from the tank, then you will need a pump. Learn more about our Rainwater Tank Pumps

Q23:How do water tanks pumps work?

Electric water pumps usually have small DC motors. This motor is contained in a sealed case attached to an impeller and it powers the impeller via a simple gear drive.

Through a series of pushes, the rotor continues to spin, driving the impeller and powering the pump so that the water is forced through to the outlet tap or system with good pressure. Learn more about our Rainwater Tank Pumps

Q24:Rainwater vs Tap Water: What is the Difference?

The biggest difference is treatment, Today’s tap water gets treated through several stages, which vary a little from place to place, but the main gist of it is:

  • Coagulation – Coagulants are added to the water, clumping dirt and particles together.
  • Sedimentation – The clumps settle to the bottom, and the water flows on clump-free.
  • Filtration – Water passes through filters, catching yet more particles and bacteria.
  • Disinfection – Adding chlorine or chloramine to kill any water-borne pathogens.

Rainwater doesn’t go through this treatment; However, for this reason Rainwater is much better for your garden.

Q25:Is Rainwater safe to drink?

Rainwater harvested directly from your tank is NOT safe to drink. There are many water-borne pathogens that find there way into your water tank either directly from the sky or from the shingles and gutters in your roof. If you want a complete rainwater harvesting system where you can utlitise the water for all uses, you need a Water Filtration System. Please see below:

Q26:What is a Water Filtration System?

A Water Filtration system is a complete rainwater harvesting system designed to deliver pure, clean rainwater to every appliance in the house with constant pressure. Learn more about our Whole of House Filtration Systems.

Q27:Are whole of house water filters safe?

Yes, whole of house water filter systems are very safe because the water is only passing through exceptionally fine chalk or sand to filter out any debris. If you are using an ultraviolet filter system, then the water is just passing under the ultra-violet light which kills any bacteria in the water and if you are using a carbon filter the water again passes through it safely to remove any taste or odor.

Q28:Where should a whole of house water filter be installed?

It is usual to place the filter system and the pump near the tank outlet. If you choose to buy a complete filter system and a pump all in the one cabinet- such as the Hybrid Housing System Mk2 then the cabinet can be placed near the tank or near the house/structure or anywhere along the water line from the tank to the house/structure.

Q29:How long does a whole of house water filter last?

How long the filter(s) last depends on lots of factors such as how clean the water is when it enters your tank(s) and how much debris has already entered the tank.

You should plan on washing and cleaning your sediment remover (normally uses diatomatious earth) every 6 months and if you have an ultra-violet filter system and/or a carbon filter system, then every 12 months.

Q30:Does a whole of house water filter reduce the water pressure?

Normally the pump will maintain a strong pressure and if you have a variable speed pump then it will adjust the pressure to keep it relatively constant.

The sediment remover filter system will reduce the water pressure slightly as it becomes more clogged with impurities while the carbon filter and/or the ultraviolet filter system will have no impact on water pressure at all.

Q31:How Are Water Tanks Eco Friendly?

Water tanks are eco-friendly because they store rainwater providing an alternative water supply for drinking, washing and outdoor use, using rainwater can also reduce water bills and take the pressure off mains water supplies. Find out more on how water tanks help the environment.

Q32:How do Rainwater Tanks help with flood management?

Water tanks have an important role to play in flood management, because they minimise storm runoff by collecting the rainwater into a vessel, so that that water does not contribute to runoff and our infrastructure does not get overloaded by rain. Some local Councils have a requirement where they are wanting effective stormwater planning which may require you to install a Stormwater Detention tank.

Q33:Why are Steel Water Tanks the best choice for the environment?

Steel water tanks require less of a carbon footprint when manufactured, they last longer, provide cleaner water and are fully recyclable. Find out more on why steel water tanks are better for the environment.

Do you have another question?

If you have a question we have not answered please do reach out to us

More Than Just a Manufacturer of Steel Rainwater Tanks

Select Water Tanks custom make round & slimline water tanks that are longer lasting, better looking, healthier, & better for the environment. They can be made from either grade 304, marine grade 316 stainless steel or colorbond steel.


Tailored Solutions

We find the perfect solution for your rainwater harvesting system needs.

Quality Guaranteed

Highest quality Stainless steel water tanks backed by 30 years non corrosion warranty. Our Colorbond Tanks are backed by 20-years non corrosion warranty.

Industry Leading

We are the first Australian company to design and manufacture stainless steel water tanks.

Looking for Help or Advice?

If you need any help with Steel Water Tank Pricing, Custom Sizing, Delivery Charges or anything else
Please contact us today - we are here to help.