Head to head

AO Smith Z9 Green RO vs LG PuriCare WW182EP: Which Should You Buy?

Specification comparison between AO Smith Z9 Green RO and LG PuriCare WW182EP
Specification	AO Smith Z9 Green RO 9.0/10	LG PuriCare WW182EP 8.8/10
Our score	9/10	8.8/10
Street price (indicative)	₹33,990	₹31,990
MRP	₹42,000	₹39,000
Brand	AO Smith	LG
Best for	Premium kitchens, high-TDS or brackish supply, and households that drink a lot of tea and coffee.	Hygiene-focused buyers, humid coastal cities, and anyone who has ever opened a purifier tank and been unpleasantly surprised.
Annual running cost (indicative)	₹4,500	₹4,400
Purification	RO + SCMT (Silver Charged Membrane Technology) + Mineraliser	RO + Dual Protection Sterilising Care UV
Storage capacity	9 litres	8 litres
Hot water	Dispenses at 45°C, 80°C and 100°C	—
Purification capacity	13 litres/hour	12 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	Stainless steel
Power	230 W (with heating)	60 W
Warranty	2 years comprehensive on select components	1 year comprehensive, 4 years on select parts
Mounting	Wall-mount	Counter-top / free-standing
Sterilisation	—	Automatic UV cycle sterilises tank and outlet every 1-2 hours
Purification score	9.3	9.0
Build quality score	9.4	9.6
Value for money score	7.8	7.6
Running cost score	8.6	8.2
Service network score	8.2	9.0
Pros	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	Stainless-steel tank resists biofilm in a way plastic simply cannot Automatic UV sterilisation of the tank and the dispensing tap, on a schedule, without you doing anything Superb build quality and finish LG's nationwide service network is reliable and genuinely reachable
Cons	Very expensive, and AMC costs match Service network is thin outside metros and large tier-2 cities Standby power draw is meaningful with the heater enabled	Expensive for 8 litres of storage Counter-top only, so it needs real kitchen space Not the best choice for extreme borewell TDS
Where to buy	Amazon Flipkart	Amazon Flipkart

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 LG PuriCare WW182EP if…

Stainless-steel tank resists biofilm in a way plastic simply cannot
Automatic UV sterilisation of the tank and the dispensing tap, on a schedule, without you doing anything
Superb build quality and finish
LG's nationwide service network is reliable and genuinely reachable

₹31,990 · 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, LG PuriCare WW182EP makes its case differently: Almost every purifier sold in India stores purified water in a sealed plastic tank at room temperature for hours at a time. In a Chennai or Kochi summer, that is an excellent environment for biofilm, and it is the failure mode nobody markets against. LG's answer is the right one on both counts: a stainless-steel tank that resists colonisation, and an automatic UV cycle that sterilises the tank and the outlet tap every couple of hours whether you remember to think about it or not.

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 LG PuriCare WW182EP — which is better?

On our overall scoring, the AO Smith Z9 Green RO edges it at 9/10 against 8.8/10. Premium kitchens, high-TDS or brackish supply, and households that drink a lot of tea and coffee. But the LG PuriCare WW182EP is cheaper at ₹31,990, and if the specific advantages of the AO Smith Z9 Green RO do not apply to your situation, the cheaper unit purifies water just as safely.

What is the price difference between AO Smith Z9 Green RO and LG PuriCare WW182EP?

The AO Smith Z9 Green RO is around ₹33,990 and the LG PuriCare WW182EP around ₹31,990 — a difference of about ₹2,000. Both are indicative street prices that change frequently, so verify on the marketplace before buying. Also compare annual running cost, which can differ by more than the purchase price over five years.

Which handles high TDS water better, AO Smith Z9 Green RO or LG PuriCare WW182EP?

The AO Smith Z9 Green RO is rated for input TDS up to 3000 ppm and the LG PuriCare WW182EP up to 2000 ppm. The AO Smith Z9 Green RO has more headroom, which matters if your supply is borewell or tanker-fed and varies seasonally.

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.