Updated: August 4, 2026

Water Storage Tank: Types, Uses & How Much Capacity You Really Need

Quick Summary

A water storage tank holds a reserve of water for use during supply disruptions, peak demand, or where mains pressure is inconsistent. In Malaysia, storage tanks are used for domestic, commercial, and industrial purposes – storing potable water, non-potable water, or chemicals. This guide explains the different types, common applications, and how to calculate the right storage capacity for your needs.

Get your storage capacity right and you’ll never be caught short during a water cut again.

Every building that relies on a consistent water supply benefits from proper storage. A water storage tank acts as a reservoir – filling up when supply is available and releasing water when you need it, smoothing out the gaps between what the mains delivers and what your household or business actually uses.

But storage isn’t one-size-fits-all. The right type and capacity depend on how you use water and what you’re storing. Here’s what you need to know.

What Is a Water Storage Tank?

Water Storage Tank Installed in Malaysia

A water storage tank is simply a container designed to hold water safely for later use. It bridges the gap between your water supply and your demand – storing water when it’s flowing and providing it when the mains is cut, low, or unable to keep up with peak usage.

In Malaysia, these tanks come in food-grade versions suitable for potable (drinking) water, as well as versions for non-potable water, waste water, and even chemical storage. Choosing the correct type for what you’re storing is essential for both safety and durability.

Types of Water Storage Tanks

Storage tanks are categorised by material, shape, and installation position:

By Material

Polyethylene (HDPE): The most common for residential storage – lightweight, food-grade, and affordable.
Stainless steel: Premium, long-lasting, and ideal for both cold and warm water storage.
Fibreglass (FRP): Used for large-capacity industrial and commercial storage.

By Shape

The most common shapes are vertical round tanks (efficient for pressure distribution, usually on a stand), and square/rectangular tanks (space-saving for tight installations). Horizontal tanks are also available for specific applications.

Common Applications

Water Storage Tank Applications Domestic Commercial Industrial

Water storage tanks serve a wide range of settings:

Domestic: Rooftop or ground tanks providing backup supply and steady pressure for homes.
Commercial: Offices, restaurants, and shops needing reliable water for daily operations.
Industrial: Factories and plants requiring large-volume storage for processes, cooling, or cleaning.
Agricultural: Farms storing water for irrigation and livestock.

How Much Storage Capacity Do You Need?

This is the most important question. According to HOMA2U, Malaysians use approximately 300 litres of water per person per day. Use this to estimate your needs:

Household Size	Est. Daily Usage	Recommended Storage
1–2 people	300–600 L	150–200 gallons
3–4 people	900–1,200 L	250–300 gallons
5–6 people	1,500–1,800 L	400 gallons
7+ people	2,100+ L	500–600 gallons

Your tank refills continuously from the mains, so it doesn’t need to hold a full day’s supply – but having at least half a day’s capacity ensures you’re covered during peak hours and short interruptions. When in doubt, size up.

Keeping Stored Water Safe

Storage is only useful if the water stays clean. A few essentials:

Use a certified, food-grade tank for potable water (SIRIM and IKRAM certified).
Keep it sealed against light, dust, and insects to prevent contamination and algae growth.
Clean it periodically – every 6 to 12 months – to remove sediment and maintain water quality.

Conclusion

A water storage tank is one of the most practical investments for any Malaysian property – ensuring you have water when the mains doesn’t deliver. The key is matching the type and capacity to your actual usage, choosing a certified food-grade tank for drinking water, and keeping it clean.

At NY Hardware, we supply a complete range of water storage tanks in Malaysia for domestic, commercial, and industrial use – in HDPE, stainless steel, and FRP, all IKRAM and SIRIM certified. Our team can help you calculate the right capacity for your needs.