Head to head
AO Smith Z9 Green RO vs Havells Aqua S: Which Should You Buy?
| Specification | ||
|---|---|---|
| Our score | 9/10 | 8.5/10 |
| Street price (indicative) | ₹33,990 | ₹21,490 |
| MRP | ₹42,000 | ₹27,500 |
| Brand | AO Smith | Havells |
| Best for | Premium kitchens, high-TDS or brackish supply, and households that drink a lot of tea and coffee. | Buyers who want hot water on tap without paying premium-brand prices. |
| Annual running cost (indicative) | ₹4,500 | ₹3,700 |
| Purification | RO + SCMT (Silver Charged Membrane Technology) + Mineraliser | RO + UV + Mineral fortification, 7-stage |
| Storage capacity | 9 litres | 6.5 litres ambient + hot tank |
| Hot water | Dispenses at 45°C, 80°C and 100°C | Dispenses at multiple temperatures up to 80°C |
| Purification capacity | 13 litres/hour | 15 litres/hour |
| Max input TDS | 3000 ppm | 2000 ppm |
| Water recovery | Up to 2x more than conventional RO (Advanced Recovery Technology) | — |
| Tank material | Food-grade, corrosion resistant | — |
| Power | 230 W (with heating) | 300 W with heating |
| Warranty | 2 years comprehensive on select components | 1 year comprehensive + 3 years on RO membrane |
| Mounting | Wall-mount | Wall-mount or counter-top |
| Purification score | 9.3 | 8.6 |
| Build quality score | 9.4 | 8.8 |
| Value for money score | 7.8 | 8.7 |
| Running cost score | 8.6 | 8.0 |
| Service network score | 8.2 | 8.6 |
| Pros |
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| Cons |
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| Where to buy |
Choose the AO Smith Z9 Green RO if…
- Three-temperature hot water on tap removes the need for a separate kettle
- Advanced Recovery Technology genuinely doubles water recovery versus conventional RO
- Rated to 3,000 ppm input — the highest in this list, covering brackish groundwater
- Outstanding build quality; the best-engineered domestic purifier sold in India
₹33,990 · Full review
Choose the Havells Aqua S if…
- Hot water dispensing for ₹12,000 less than the AO Smith Z9
- Three-year warranty on the RO membrane, which is unusually generous
- Excellent design — one of the few purifiers that looks good in a modern kitchen
- Havells' pan-India electricals service network is dependable
₹21,490 · Full review
The deciding factors
The Z9 is the best domestic water purifier sold in India, and I say that fully aware of the price. Three things justify it. First, the 3,000 ppm input rating — nothing else mainstream goes that high, and in Jodhpur, Bikaner, Agra or coastal Chennai that headroom is the difference between a membrane that lasts a year and one that dies in five months. Second, Advanced Recovery Technology, which is the most substantive water-saving engineering in the category rather than a sticker. Third, the hot water: 45°C, 80°C and 100°C on demand, properly child-locked, which quietly eliminates the kettle from your counter.
Against that, Havells Aqua S makes its case differently: The Aqua S is the value play in hot-water purifiers. AO Smith's Z9 is the better machine, but it is ₹34,000 and the Aqua S delivers the feature that actually changes your daily routine — instant hot water for tea, coffee and baby formula — for ₹21,500, in a better-looking body, with a three-year membrane warranty attached.
Our practical advice: unless the AO Smith Z9 Green RO's specific advantages match a real constraint you have — tank size for long water cuts, a higher TDS rating for brackish supply, hot water you will genuinely use — the cheaper unit is the better purchase. In this category, paying for capability you will never use is the most common way money gets wasted.
Frequently asked questions
AO Smith Z9 Green RO or Havells Aqua S — which is better?
What is the price difference between AO Smith Z9 Green RO and Havells Aqua S?
Which handles high TDS water better, AO Smith Z9 Green RO or Havells Aqua S?
Still undecided?
Tell us your city, your water source and your TDS if you know it, and we will tell you which of these two is right for you — or whether a third option fits better.