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Fiberglass Vs Steel Pressure Tank [The ultimate Comparison]

Both fiberglass and steel pressure tanks are used for storing water under pressure for emergency supplies when the water tank is not working. But, they have differences in terms of use.

As a potential user, what do you prefer between fiberglass Vs steel pressure tanks? Well, that depends entirely on your intended use for the container. Although fiberglass storage tanks are great for holding water, they should not be used as portable water containers. Whereas stainless steel is the ideal choice.

Fiberglass Vs Steel Pressure Tank

However, you should choose based on your needs. In this article, we will help you choose the best tank for your purposes. So stick till the end to learn something very informative.

What Are Steel Pressure Tanks?

Steel pressure tanks are more resistant to corrosion, wear, and tear in cracks when they are used with both clean and dirty water. Additionally, in terms of heat resistance and being unaffected by harmful radiation, this substance is also durable.

Steel pressure tanks have a lower chance of rusting, freezing, or cracking. The existence of this type of pressure tank goes back more than a decade, and for a good reason. Even though there aren’t many color choices for this tank, it’s pretty simple and easy to fix if something goes wrong.

What Are the Benefits of Using Steel?

As previously stated, steel pressure tanks have several significant advantages. They are as follows.


If you didn’t already know, steel is the second most powerful and most widely used metal on the planet. It is a very important metal and is among the most recycled products. Steel tanks are tough and mechanically steady substances.

Resistance to Fire

Another neat feature is their high resistance to fire. Since they are non-combustible, they are less likely to catch fire.

Multiple Sizes

They come in a variety of sizes, including small and large. It helps to solve the most difficult problem, which is relocating large amounts of liquid in a single tank.

Simple Repair

Whenever a steel tank is damaged, you can decide whether to fix it yourself or hire a metal manufacturer to fix it.

What Are the Drawbacks of Using Steel?

As long as steel pressure tanks feature many advantages, there are some drawbacks too.

Not Resilient

Given the information above, you may already be aware that steel is very strong, but did you also know that it isn’t long-lasting enough?

Strength and durability are not the same things at all. With time, steel tanks can become weak. When they are used frequently, they slowly weaken and get damaged.

Despite their strength, steel tanks can lose structural integrity over time due to their construction, which is either welded or bolted together. Because of this, they become less durable and need to be fixed because they can no longer handle normal wear and tear.

Inclined To Rust

Even though steel pressure tanks are persistent in rusting, they are not inevitable and will eventually rust because it combines carbon and iron. In general, these tanks need to be covered with zinc, paint, or something similar to keep them from rusting.

This coating may corrode if it sustains damage. Even if it has a zinc coating on the inside, it could leak into drinking water and make the water taste bitter.

Intensive Labor Work

Steel tanks require more construction workers than other substances, like fiberglass tanks. This happens because they need numerous sections to be put together.


The final drawback is that they are significantly heavier in terms of any metal. Compared to other tanks, steel tanks are more difficult to move.

As a result, positioning them for various purposes on the site is difficult. Or larger machines are needed to transport them.

What Exactly Are Fiberglass Tanks?

Fiberglass tanks are expertly crafted with smooth, wrapped fiberglass structures. They don’t rust, get dents, or fall apart at the seams because they don’t have seams and have a strong base.

They primarily serve as emergency drinking water storage containers. This tank’s ability to withstand corrosion and survive a lifetime adds to its attractiveness.

If we study them in depth, compared to steel tanks, they are lighter and more suitable, with many benefits. One of their main drawbacks is that they support the growth of algae on their surface, which can be poisonous to consume.

What are the advantages of choosing fiberglass?

Fiberglass is a material of choice for eco-friendly buildings in the future. Let us see some of their advantages.


Fiberglass is a strong and inexpensive material that can be used in place of other materials because it is light and easy to shape. These tanks are made of fiberglass, which is quite lighter than steel.

Chemical Protection

Because fiberglass composite is resistant to most chemicals, like acids, bases, and sulfur gases, it is a suitable material for corrosive environments.

Resistant To Rust

The fact that glass does not rust is one of its greatest advantages. They are constructed from a non-rusting composite material that consists of resin and glass. In actuality, the material contains no metal that may rust.

Tensile power

Molded goods are created using fiberglass, often known as GRP. A strong composite composed of fiberglass and resin is long-lasting and has a high tensile strength.

What are the disadvantages of choosing fiberglass?

The many benefits of fiberglass are not without some drawbacks. Please show us a few examples.

Necessitates A Coating

Whenever a fiberglass-reinforced product needs to be built or fixed, the most frequent surface treatment employed is gelcoat.

A UV-resistant and temperature-reducing exterior gelcoat is necessary for fiberglass transport tanks. Nevertheless, the heat can go through much more quickly if there is damage.

Exhaustingly Time Consuming

A labor-intensive process or sector uses plenty of workers to make its products. Because they have to be put together by hand, fiberglass cargo tanks can sometimes go wrong.


The material of choice for aircraft and boat construction is fiberglass, which is very strong. Fiberglass can develop tiny cracks that eventually spread and become more obvious.

It s not ideal for hauling across rough cropland, slopes, or other hard surfaces because it can quickly break and shatter in a rising situation.

Need To Be Lined Inside

To qualify for food testing, transport tanks made of fiberglass glass must have a coating on the inside. If it’s not, you can’t use it to transport drinking water without risk. This lining needs special care to avoid tears.

Which One Is Better, A Fiberglass Or Steel Pressure Tank?

For a long time, we have gathered the news about the merits and demerits of fiberglass and steel tanks, now let us compare them both side to side to get a better understanding.

SizeLargeSmall, Large
DurabilityLasts for a long timeInclined to Rust Quickly
RigidnessCan break easilyNot prone to damage
Resistant to Rust  YesNo
Resistance to Fire  YesYes

Figure 1: Comparison between Fiberglass Vs Steel Pressure Tank

We can observe from the above chart that steel and fiberglass are fairly hefty when compared to both sides.

As we can see, steel is heavy while fiberglass is light in terms of weight. We can see that fiberglass may shatter easily and still stay for a very long period on another side. Finally, we can observe that both of them are fire-resistant.

Therefore, we can state that both materials are excellent choices for pressure tanks, but fiberglass, in our opinion, performs better than steel. Fiberglass is available in huge proportions, is fire resistant, lightweight, and may endure for a very long period, all of which benefit the buyer.


Both of the aforementioned tanks are excellent choices. However, you must pick the one between fiberglass Vs steel pressure tanks that best suits your needs in terms of cost and purposes.

From what has been said so far, it should be clear that fiberglass storage tanks are excellent for storing water but are not suitable for use as portable water containers. On the other hand, stainless steel tanks are ideal for this purpose, however other materials can be utilized.

Further Read:

Can I Shower If My Septic Tank Is Full?