What Size Water Tank Should I Buy? A Comprehensive Guide

Choosing the right water tank is a pivotal decision for homeowners, businesses, and agricultural operations. Beyond cost considerations, selecting the correct size water tank involves evaluating water usage patterns, local rainfall, available space, and whether the tank will serve as a supplementary water source or provide all water needs. But don’t let all this overwhelm you. We have created this helpful guide to help you explore the different factors influencing tank selection, the benefits of different tank types, and how to optimise your investment for long-term value. Rest assured, by the end of the guide you will have a pretty good idea on the exact tank you need for your home or business needs.

Why Invest in a Water Tank?

A water tank offers a range of benefits beyond simply storing rainwater. These include:
1. Water Conservation: Capturing rainwater reduces dependency on municipal supplies, contributing to environmental sustainability.
2. Cost Savings: Over time, rainwater harvesting can lead to significant reductions in water bills.
3. Self-Sufficiency: In areas with unreliable water supply or during droughts, a water tank ensures consistent access to water.
4. Versatility: Modern water tanks can serve various purposes, from garden irrigation to drinking water (with appropriate filtration systems).

Key Factors to Determine the Right Tank Size

1. Water Usage Patterns

Understanding your water consumption is the cornerstone of choosing the right size tank. Ask yourself:
• Supplemental Use: Will the tank be used alongside municipal water for gardening, washing cars, or other occasional needs? If so, a smaller tank (1,000–2,000 litres) may suffice.
• Primary Water Source: For properties entirely reliant on rainwater, larger tanks (10,000 litres or more) are essential to meet daily household or business demands.

2. Local Rainfall and Roof Catchment

Rainfall patterns vary widely by location, directly influencing how much water you can harvest. For example:
• In regions with high annual rainfall, smaller tanks may suffice since they can be replenished frequently.
• Conversely, in arid areas, larger tanks are necessary to store enough water during dry spells.
Use the formula below to estimate your water collection potential:

Roof Area (m) x Annual Rainfall (mm) x 0.85 + Litres of Water Harvested Per Year

3. Space Availability

The available space on your property will influence both the size and type of water tank you select:
• Compact Urban Properties: Slimline water tanks are ideal, as they fit neatly along walls and fences.
• Rural or Large Properties: Round poly or steel water tanks offer substantial capacity and can be installed in open spaces.
• Underground Tanks: Perfect for properties where aesthetics or space constraints are priorities.

4. Material Preferences

Different water tank materials offer distinct advantages, making some more suitable for specific applications than others.

Advantages and Features of Different Types of Water Tanks

Poly Water Tanks

Poly water tanks, made from high-density polyethylene, are among the most popular choices for residential and commercial applications.
Advantages:
• Lightweight and Easy to Install: Poly tanks are easy to transport and install, even in remote locations.
• Durable and Weather-Resistant: Resistant to rust, corrosion, and UV rays, they are suitable for harsh climates.
• Cost-Effective: Poly water tanks are typically more affordable than steel alternatives, offering excellent value for money.
• Variety of Sizes and Shapes: Available in slimline, round, and underground models to suit various needs.
Ideal For:
Homeowners seeking a reliable, low-maintenance solution for medium-capacity water storage.

Steel Water Tanks

Steel water tanks, often made from galvanised or stainless steel, are renowned for their strength and longevity.
Advantages:
• High Capacity: Steel tanks can store large volumes of water, making them ideal for agricultural or industrial use.
• Longevity: With proper maintenance, steel tanks can last for decades, providing a long-term investment.
• Temperature Stability: Steel tanks help maintain consistent water temperature, which is beneficial in extreme climates.
• Customisable: Available in modular designs for large-scale installations.
Ideal For:
Large households, farms, and businesses requiring significant water storage capacity.

Slimline Water Tanks

Slimline water tanks are specifically designed to maximise storage in confined spaces.
Advantages:
• Space-Saving Design: Their narrow, elongated shape allows them to fit into tight spaces such as along walls or fences.
• Aesthetic Appeal: Slimline tanks are available in various colours and finishes to complement property exteriors.
• Moderate Capacity: While compact, they still offer sufficient capacity for small to medium-scale water needs.
Ideal For:
Urban properties or households with limited outdoor space.

Underground Water Tanks

Underground water tanks provide a discreet and efficient solution for water storage.
Advantages:
• Space Efficiency: Installed below ground, they free up valuable surface area for other uses.
• Aesthetic Benefits: Completely hidden from view, making them ideal for landscaped properties.
• Durability: Constructed from heavy-duty materials to withstand soil pressure and external forces.
• Temperature Regulation: Underground placement helps maintain stable water temperatures year-round.
Ideal For:
Properties with space or visual restrictions, or for large-scale water storage in urban areas.

Benefits of Installing a Water Tank

1. Environmental Impact
Rainwater harvesting significantly reduces the strain on municipal water systems and helps conserve natural resources. By choosing a water tank, you contribute to reducing water wastage and promoting sustainability.

2. Cost Savings
Over time, water tanks can lower water bills by reducing dependency on paid supplies. For businesses and farms, this can translate to substantial financial benefits.

3. Emergency Preparedness
Water tanks provide a reliable backup during droughts or supply interruptions. Properties relying on underground water tanks are particularly resilient in emergencies.

4. Improved Property Value
Installing a water tank can enhance the value of your property, especially in regions where water conservation is a priority.

Common Questions About Water Tanks

Q: Which is better: a poly water tank or a steel water tank?
A: Poly water tanks are ideal for smaller capacities and budget-friendly installations, while steel water tanks are better for larger, long-term storage needs.

Q: Is a slimline tank sufficient for my home?
A: Slimline water tanks are excellent for properties with limited space but may not be suitable for homes requiring high-capacity storage.

Q: What maintenance does an underground water tank require?
A: Regular inspections of seals, pumps, and filtration systems are essential to ensure optimal performance and prevent contamination.

Tips for Making the Right Choice

1. Assess Long-Term Needs: Consider future water requirements to avoid underestimating capacity.
2. Consult Local Experts: Water tank suppliers can provide tailored recommendations based on local rainfall, water use, and property layout.
3. Factor in Installation Costs: Underground tanks and large steel tanks may require professional installation, which should be included in your budget.

Conclusion

Choosing the right size and type of water tank is a critical decision that depends on your water needs, local rainfall, available space, and budget. From versatile poly water tanks to robust steel water tanks and space-saving slimline models, there’s a solution to suit every requirement.

Explore the extensive range of water tanks for sale at Water Tank Factory. Or call our expert team on 1300 826 532  and let them help you find the perfect rainwater tank to meet all your family’s or business needs, now and for many years to come.