Concrete or Fibreglass Water Tank? Which Is Better for Your Home

Updated 2026-10-20 · Concrete Tank team

When choosing a water tank for a home or building, most people weigh up two options a reinforced concrete tank and a fibreglass tank. Each has its strengths, and the right choice depends on the capacity you need, where it will be installed and how long you want it to last.

1. Lifespan and durability

Reinforced concrete is one of the strongest building materials. A tank built under engineering supervision and properly waterproofed lasts for a very long time. It is not affected by impacts or pressure, and it can carry the weight of soil when installed underground.

Fibreglass is strong for its weight, but less resistant to impacts, and its surface can degrade after years of direct sun exposure.

2. Water temperature

In a Saudi summer this matters. Thick concrete walls insulate against heat, so water in a concrete tank stays much cooler than in thin-walled tanks that heat up quickly in the sun.

3. Capacity

If you need large capacity (over 10 m³), concrete is the practical choice. Our ready-made sizes range from 14 m³ to 29 m³ for villas, buildings and farms.

4. Underground or above ground?

Concrete tanks work underground or above ground on a plinth. Underground tanks need strong external waterproofing (bitumen) to keep out moisture and groundwater, standard on all our tanks.

Fibreglass is lighter, so it is easier to place on rooftops, that is its main advantage.

5. Long-term cost

Fibreglass can be cheaper for small sizes. But factoring in large capacity, long life and low maintenance, concrete is usually more economical over time. Compare our concrete tank prices.

Summary

If you want a tank that lasts for years with large capacity and cooler water, choose concrete. Not sure which size? Try the size calculator.