How to Choose the Best Water Tank for Your Home.
A water tank isn’t something you buy every year — a good one can serve your family for over a decade, while a poor choice can mean cracks, contaminated water, and repeated repairs. Whether you’re building a new home or replacing an old tank, here’s a practical guide to picking the right one.
1. Decide the Right Capacity First
Before comparing brands or materials, work out how much water your household actually needs.
Formula: Daily requirement = Number of family members × 135 litres (average per-person daily use in Indian households)
Add a buffer of 20–30% for water-scarce areas, power cuts, or irregular municipal supply
Common household sizes:
3–4 members: 500–750 litres
5–6 members: 1000 litres
Joint families or independent houses: 1500–2000 litres
If you have both an overhead tank and an underground sump, split the capacity roughly 60% underground and 40% overhead for balanced storage and pump efficiency.
2. Choose the Right Material
Most home water tanks today are made from plastic (LLDPE/HDPE) or older materials like concrete and steel. Here’s how they compare:
Material
Pros
Cons
LLDPE/HDPE Plastic
Lightweight, rust-proof, food-grade, easy to install, long life
Can degrade faster in direct harsh sunlight if not UV-treated
Concrete/Sump
Very high capacity, hidden underground
Prone to leaks and cracks over time, needs regular cleaning
Stainless Steel
Durable, sleek look
Expensive, can heat up water in summer
For most homes, a multi-layer LLDPE plastic tank offers the best balance of durability, hygiene, and cost. This is where brands matter — not all plastic tanks are built the same.
3. Check the Layer Construction
Water tanks are typically sold as single, double, triple, or four-layer tanks:
Single/Double layer: Budget-friendly but offer less UV and heat protection
Triple layer: A UV-stabilized outer layer, a black middle layer to block sunlight, and a food-grade inner layer — ideal for most climates
Four layer (foam-insulated): Adds a foam layer that keeps water cooler in summer and prevents algae growth — best for regions with intense heat
This is one area where Purewell water tanks by Shree Balaji Polymers stand out. Their triple-layer and four-layer foam-insulated tanks use a UV-stabilized outer shell, an anti-bacterial marble-finish inner layer, and reinforced ribbed structures for added strength — reducing bulging even when the tank is completely full.
4. Look for Hygiene and Food-Grade Certification
Since this tank stores your family’s drinking and cooking water, hygiene should never be an afterthought. Look for:
Food-grade LLDPE material — ensures no chemical leaching into water
ISI-marked / ISO-compliant manufacturing
Airtight, interlocking lids that keep out dust, insects, and sunlight
Purewell tanks, for instance, are built with food-grade LLDPE and a supreme airtight interlock lid designed specifically to keep stored water free from contamination, dust, and flies.
5. Check Structural Strength and Design
A tank that looks good but bulges or cracks under full load is a liability. Things to verify before buying:
Uniform wall thickness — prevents weak spots that lead to bulging or bursting
Monocoque structure with ribbing — adds strength without adding excess weight
Roto-moulded construction — a single-piece, seamless build with no joints or welds that could leak
6. Plumber-Friendly Design
A well-designed tank should make installation and maintenance simple:
Multiple outlet options for flexible plumbing
Clearly marked inlet and overflow points
Easy-access lid for periodic cleaning
This small detail saves real money on installation and future servicing — something worth asking your plumber or dealer about before you finalize a tank.
7. Buy From a Trusted, Established Manufacturer
Water tanks are a long-term investment, so brand reliability matters as much as specifications. Look for manufacturers with:
Decades of manufacturing experience
Wide distributor and service network
Consistent quality checks during production
Shree Balaji Polymers, established in 1980 and based in Ghaziabad, has been manufacturing water tanks, PVC pipes, and related hardware products for over four decades. Their Purewell water tank range — available from 100 to 10,000 litres — is manufactured using virgin, UV-stabilized plastic and advanced roto-moulding technology, with a pan-India distribution and service network.
Quick Checklist Before You Buy
✅ Calculate the right capacity for your household
✅ Choose triple or four-layer construction for better UV and heat protection
✅ Confirm food-grade, ISI-compliant material
✅ Check for uniform wall thickness and ribbed structural support
✅ Prefer multi-outlet, plumber-friendly designs
✅ Buy from an established manufacturer with a strong service network
