Rainwater Tanks in South Africa: Everything You Need To Know

Benefits of Rainwater Collection Tanks

The benefits of rainwater harvesting are vast, and the use of a rainwater collection tank can provide significant savings in both water and financial resources. Below are some of the benefits of rainwater collection tanks:

• Water Conservation: One of the most significant benefits of rainwater collection tanks is water conservation. The water stored in these tanks can be used for various purposes, such as gardening, washing clothes, and flushing toilets, thereby reducing the demand for fresh water.
• Cost Savings: Collecting rainwater in a storage tank can help reduce water bills, especially for those who use a lot of water for outdoor purposes such as gardening or car washing.
• Self-sufficiency: Rainwater harvesting provides a level of self-sufficiency, as it reduces reliance on municipal water sources, which may be subject to water restrictions or supply interruptions.
• Environmentally Friendly: Rainwater harvesting is an environmentally friendly practice that helps reduce the carbon footprint by reducing the demand for fresh water.

Types of Rainwater Tanks

Plastic Rainwater Collection Tanks

Plastic rainwater collection tanks are the most commonly used type of tank. They come in various sizes and are relatively inexpensive, making them an attractive option for most homeowners. Plastic tanks are lightweight, easy to install, and require very little maintenance. They are also available in different colours to match your home’s exterior.

One disadvantage of plastic tanks is that they can become brittle over time, especially if they are exposed to sunlight. This can cause them to crack or leak, requiring replacement. Plastic tanks are also not suitable for underground installation, as they can collapse under the weight of the soil. 

Metal Rainwater Collection Tanks

Metal rainwater collection tanks are durable, long-lasting, and can hold a large amount of water. They are also resistant to UV radiation, which can cause plastic tanks to deteriorate. Metal tanks can be made of various materials, including galvanised steel, stainless steel, and aluminium. They can also be painted to match your home’s exterior.

One disadvantage of metal tanks is that they are more expensive than plastic tanks. They are also heavier and require professional installation, which can increase the overall cost. Metal tanks can also rust over time, especially if they are not properly maintained.

Concrete Rainwater Collection Tanks

Concrete rainwater collection tanks are sturdy, long-lasting, and can hold a large amount of water. They are also resistant to UV radiation, which can cause plastic tanks to deteriorate. Concrete tanks can be installed underground or above ground and can be customised to fit your needs. They can also be painted or coated to match your home’s exterior.

One disadvantage of concrete tanks is that they are heavy and require professional installation. They can also crack or leak over time, requiring repair. Concrete tanks can also be expensive, especially if they are customised to fit your needs.

Fibreglass Rainwater Collection Tanks

Fibreglass rainwater collection tanks are lightweight, easy to install, and can hold a large amount of water. They are also resistant to UV radiation, which can cause plastic tanks to deteriorate. Fibreglass tanks can be made in various sizes and shapes and can be customised to fit your needs. They can also be painted or coated to match your home’s exterior.

One disadvantage of fibreglass tanks is that they are more expensive than plastic tanks. They can also crack or leak over time, requiring repair. Fibreglass tanks are also not suitable for underground installation, as they can collapse under the weight of the soil.

Bladder Rainwater Collection Tanks

Bladder rainwater collection tanks are flexible, lightweight, and easy to install. They can be placed in various locations on your property and can be expanded or contracted as needed. Bladder tanks are made of PVC or polyurethane and are suitable for underground or above ground installation. They are also relatively inexpensive compared to other types of tanks.

One disadvantage of bladder tanks is that they can puncture or tear over time, requiring replacement. They can also be affected by UV radiation, which can cause them to deteriorate. Bladder tanks are also not suitable for holding large amounts of water.

Checklist for Buying a Rainwater Collection Tank

Before purchasing a rainwater collection tank, you need to consider several factors. Below is a checklist to help you choose the right tank for your needs:

1. Rainwater Harvesting Yield: The first factor to consider before purchasing a rainwater collection tank is the yield. Determine if it is possible to harvest rainwater in the area where you live. What is the average rainfall in your area? What is the total surface area of your roof?
2. Size of the Tank: The size of the tank you need depends on your usage and the average rainfall in your area. Calculate how much water you need and how often you will use it.
3. Material: Rainwater collection tanks come in different materials, such as plastic, metal, or concrete. Choose a material that is durable and suitable for your climate.
4. Cost: Determine your budget and choose a tank that fits within it.
5. Installation: Consider the installation process and choose a tank that is easy to install.
6. Maintenance: Consider the maintenance requirements of the tank and choose a tank that is easy to maintain.
7. Warranty: Look for a tank that comes with a warranty.

Choosing the Right Rainwater Tank for You

The first step in installing a rainwater tank is choosing the right one for your household’s needs. Here are some factors to consider when choosing a rainwater tank:

• The size of your household and your water usage
• The size of your property and available space for the tank
• The material of the tank
• The cost of the tank and installation
• The durability and warranty of the tank

The installation process should be carried out by a professional who is experienced in rainwater tank installation. This will ensure that the tank is installed correctly and is safe to use.