AO Smith Z9 Pro vs Kent Supreme Plus: Best Premium RO Water Purifier in India 2026?

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Quick Overview

Choosing a premium RO water purifier in India often comes down to two names: AO Smith and Kent. The AO Smith Z9 Pro Black is the current flagship model from the American brand, priced at Rs. 23,999, with ambient and instant hot water, copper infusion, and 10L storage. The Kent Supreme Plus is one of India’s most purchased RO purifiers with 15,322 Amazon reviews, priced at Rs. 15,599, offering RO+UV+UF+Alkaline+Copper purification. One is the premium new-generation option. The other is the most field-tested RO in its segment. This comparison breaks down which one is worth your money.

Full Specs Comparison Table

1. AO Smith Z9 Pro Black Review

The AO Smith Z9 Pro Black represents the current top of AO Smith’s India lineup. The most distinctive feature is the instant hot water output, which means you get purified hot water on demand without a separate appliance. This is genuinely useful in Indian households for making chai, dal, or instant meals. The Copper Charger system adds copper benefits to purified water without the risk of excess copper leaching from a copper tank, making it a safer approach than some competitors. The Silver Shield technology inside the tank inhibits bacterial growth in stored water. The 10-litre tank is larger than the standard 8-litre capacity found in most mid-segment purifiers. At Rs. 23,999, the AO Smith Z9 Pro Black is a premium buy, but the hot water feature alone justifies a significant portion of that premium for households that use hot water frequently.

2. Kent Supreme Plus Review

The Kent Supreme Plus is the most reviewed purifier in its segment on Amazon India. With 15,322 reviews at 4.1 stars, it has been tested in real Indian homes across different water quality conditions, from borewell to municipal to tanker supply. The combination of RO + UV + UF ensures three layers of purification, with the UV stage eliminating any microorganisms that RO membranes cannot fully remove. The TDS Controller is a Kent-patented feature that mixes a small amount of the original source water back into the purified output, retaining essential minerals that pure RO removes. The UV LED protection in the tank continuously treats stored water, preventing bacterial regrowth. At 20 LPH, the output rate is high enough for large families. The price at Rs. 15,599 makes it Rs. 8,400 cheaper than the AO Smith Z9 Pro, and it delivers on all core purification parameters.

Filtration and Water Quality

Both the AO Smith Z9 Pro Black and the Kent Supreme Plus use RO as the primary purification method, which removes dissolved salts, heavy metals, and most contaminants. The Kent adds UV and UF as additional purification stages, making it a more complete multi-stage system on paper. The AO Smith focuses on mineral enrichment, copper infusion, and alkaline output after RO purification. For homes with very high TDS water (borewell or tanker supply), the Kent’s TDS Controller is a valuable feature. For homes with municipal water where the main concern is better-tasting, mineral-rich water, the AO Smith delivers a more premium output.

Winner: Filtration: Kent Supreme Plus for multi-stage RO+UV+UF coverage. AO Smith Z9 Pro wins for mineral-rich output and safer copper enrichment method.

Smart Features and Technology

The AO Smith Z9 Pro Black leads on features. Instant hot water, Silver Shield tank protection, and the Copper Charger are unique to this model in the comparison. The instant hot water alone makes it a multi-functional appliance in the kitchen. The Kent Supreme Plus counters with UV LED tank protection, Auto Flush to keep membranes clean, and the patented TDS Controller. Both have auto shut-off when the tank is full. The AO Smith edges ahead on innovation. The Kent wins on having a more proven, field-tested feature set backed by 15,000 real users.

Winner: Features: AO Smith Z9 Pro Black for hot water, copper safety, and premium tech. Kent Supreme Plus for proven multi-stage filtration and wide service support.

Value for Money

At Rs. 15,599, the Kent Supreme Plus gives you India’s most proven premium RO package at a lower price. The Rs. 8,400 you save over the AO Smith covers 2 to 3 years of filter cartridge replacements. For families who do not need hot water from their purifier, the Kent delivers better value. For households that do use hot water frequently, the AO Smith Z9 Pro Black replaces the need for a separate electric kettle, which offsets some of the price difference.

Winner: Value for Money: Kent Supreme Plus for most households. AO Smith Z9 Pro Black wins if you need hot purified water daily.

Final Verdict: Which Should You Buy?

Both the AO Smith Z9 Pro Black and the Kent Supreme Plus are excellent premium RO purifiers. The right choice depends on which features matter most to your household.

Buy the Kent Supreme Plus if: you want the most proven, widely reviewed purifier in this segment, you have high TDS water and need the TDS Controller, you want a wide service network across India, or budget is a consideration.

Buy the AO Smith Z9 Pro Black if: you want instant hot purified water, you want a safer copper enrichment method, you prefer a premium aesthetic, or you want a single appliance that replaces both a purifier and a kettle.

Also See These Water Purifier Comparisons

• Kent Grand Plus vs AquaGuard Aura RO: Best Water Purifier Under Rs. 15,000?

Frequently Asked Questions

Is the AO Smith Z9 Pro worth buying in India?

Yes, the AO Smith Z9 Pro Black is worth buying for households that want instant hot purified water, safer copper enrichment, and a 10L storage tank. At Rs. 23,999 it is a premium buy, but the hot water feature adds real daily utility.

How many reviews does the Kent Supreme Plus have on Amazon?

The Kent Supreme Plus has 15,322 reviews on Amazon India with a 4.1-star rating, making it one of the most verified RO water purifiers in the premium segment.

Which is better for borewell water, AO Smith or Kent?

For borewell water with high TDS, the Kent Supreme Plus with its TDS Controller and RO+UV+UF multi-stage filtration is the more suitable choice. The AO Smith Z9 Pro handles borewell water well too, but the Kent’s TDS control preserves essential minerals better.

Does the AO Smith Z9 Pro give hot water?

Yes, the AO Smith Z9 Pro Black offers both ambient and instant hot purified water, which is a standout feature at this price point and makes it useful beyond just drinking water.

What is the storage capacity of the Kent Supreme Plus?

The Kent Supreme Plus has an 8-litre storage tank with UV LED protection to keep water fresh after purification.