smart water

The Smart Water Way to Choose a Water Tank

Do you want to install a water tank but don’t know what size to get? Don’t worry, we’re here to help! In this blog post, we will discuss a range of factors you need to consider when sizing a water tank for your home. We’ll also provide some tips on how to choose the right tank for your needs. So, whether you’re just starting out or looking for an upgrade, read on for more information!

How much water do I need?

One of the first things you need to consider when sizing a water tank is how much water you need. This will depend on several factors, such as the climate you live in, the size of your home, and your water usage. For example, if you live in a dry climate or have a large home, you’ll need a larger tank to account for evaporation and usage. The average family in Australia consumes around four hundred liters of water per day, so you’ll need to factor this into your calculations.

What is the average rainfall in my area?

The next thing you need to consider is the average rainfall in your area. This will help you determine how much water you can collect from rainwater, and how often you’ll need to top up your tank. You can check the average rainfall for your area online or with your local weather station. Australia’s annual average rainfall is about 69cm, so you can expect to collect about 7365 liters of water from your ninety-three square meter roof each year.

What size tank do I need?

Now that you’ve considered your water usage and the average rainfall in your area, you can start to calculate the size tank you need. A good rule of thumb is to multiply your daily water usage by three hundred. So, if you use one hundred liters of water per day, you’ll need a tank that can hold 30,000 liters or about eight thousand gallons.

If you live in an area with high rainfall, you may want to consider a larger tank. This will help ensure that you have a supply of water even during periods of low rainfall.

When choosing a tank, it’s also important to consider the space you have available. Rainwater tanks come in all shapes and sizes, so you’ll need to find one that fits the available space on your property.

How to calculate the water collected from my roof:

The first thing you need to do is calculate the catchment area of your roof. This is the total area of your roof that will collect rainwater. To do this, simply measure the length and width of your roof and multiply them together. For example, if your roof is thirty meters long and fifteen meters wide, your catchment area is 450 square meters.

Now that you know your catchment area, you can calculate how much water you can expect to collect during a rainstorm. For every square meter of catchment area, you can expect to collect about 0.25 liters of water. So, in our example above, the tank would need to be at least 112.50 liters to catch all the water from a rainstorm.

What is the ideal water level for my tank?

This will depend on a few factors, such as the height of your gutters and the location of your tank. You want to aim for a water level that is at least half-full. This will ensure that you have enough water to last through a dry spell, but not so much that it overflows and goes to waste. You also need to consider which water level indicator or water level sensor to install. These devices are essential for keeping track of your tank’s water level and ensuring that that it doesn’t run dry. Choose a model that is easy to read and install, so that you can always keep an eye on your tank’s water level like the award-winning

Should I use one large water tank or multiple smaller ones?

There are pros and cons to both large and small water tanks. Large water tanks can be more expensive upfront, but they will save you money overall. Smaller water tanks are less expensive to purchase, but you will have to replace them more often.

Another factor to consider is the space you have available. If you have a small yard, multiple smaller water tanks may be a better option because they will take up less space.

Now that you know how to size a water tank for your home, you can be sure that you’ll always have enough water on hand, no matter what the weather brings. Be prepared for anything by choosing the right size tank for your needs.

If you are still unsure about what size tank to purchase, consult with a professional who can help you select the best option for your home.

For more information about water tanks see our previous post on the several types of water tanks available


Sizing a water tank for your home can be a tricky task. But with the help of a professional, and by considering the topics that we have discussed, you can be sure to choose the perfect tank for your needs. For more information on choosing the right tank, check out our previous post on the topic. Thanks for reading!

Author’s Note:

If you have any questions or comments, please feel free to leave them below. I will respond as soon as I can. Thanks for reading!