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Water Purifiers · head to head

Z3 (Onyx Black) vs Sereno (Stainless Steel Tank)

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Quick verdict

  • Z3 (Onyx Black) is better for not sure.
  • Sereno (Stainless Steel Tank) is better for 1 to 3.
  • Sereno (Stainless Steel Tank) is better for less water wasted.
  • Sereno (Stainless Steel Tank) is better for longer warranty.
  • Z3 (Onyx Black) leads on purification.
  • Sereno (Stainless Steel Tank) offers better overall value (26.2 points per ₹10,000).
  • Sereno (Stainless Steel Tank) has the higher Comparezi Score (57.7).
  • Sereno (Stainless Steel Tank) is the cheaper option at ₹21,990.

Computed from stored specifications, the published water purifiers scoring rules and recorded prices. Not an opinion.

Winners by area

Purification Z3 (Onyx Black)
Capacity Tie
Ownership Sereno (Stainless Steel Tank)
Value Sereno (Stainless Steel Tank)

Specifications side by side

Spec
Z3 (Onyx Black)
Sereno (Stainless Steel Tank)
Purification
Technology
RO + UV LED + Antioxidant + Copper + Alkaline
RO + UV + UF + Copper + Mineral (In-tank UV LED)
RO
Yes
Yes
UV
Yes
Yes
UF
—
Yes
UV in tank
—
Yes
Alkaline
Yes
—
Copper / zinc infusion
Yes
Yes
Purification stages
8
8
Max input TDS
2,000 ppm (better)
1,500 ppm
Capacity
Storage
6 litres (better)
5.5 litres
Purification rate
15 L/h
15 L/h
Water recovery
55%
60% (better)
Build and features
Installation
Under sink
Wall
Power
48 W
—
Tank material
Food safe, non-toxic, engineering grade plastics
Stainless steel (food grade 304)
Model number
—
Liv-Sereno-SS
Colours
Onyx Black
Black
Ownership
Warranty
1 year
2.5 years (better)
Warranty terms
Z3 comes with 1 year comprehensive warranty that covers all filters, RO Membrane and electrical parts.
30-Months Comprehensive Coverage: comprehensive 30-month free warranty that covers all aspects of your product.

A tick marks the better value where the category rules say higher (or lower) is better. Text values are shown without a winner. Ties have no winner.

Price and availability

Store links are not paid: prices are copied from each store's own page with the date checked, and Comparezi earns only from labelled ads. How we earn

Z3 (Onyx Black)

₹29,990

Sereno (Stainless Steel Tank)

₹21,990

Pros and cons

Z3 (Onyx Black)

No stated figure stands out against similar models on Comparezi, either way.

Sereno (Stainless Steel Tank)

  • Pro: 2.5 years warranty, longer than 98% of the 64 water purifiers on Comparezi that state it
  • Pro: UV light inside the storage tank keeps stored water treated
  • Con: Smaller storage tank than 80% of the 66 water purifiers on Comparezi that state it (5.5 litres)
  • Con: Lower maximum input TDS than 97% of the 34 RO purifiers on Comparezi that state it (1,500 ppm)

Which should you buy?

Sereno (Stainless Steel Tank) if you want the strongest overall specification: it has the higher Comparezi Score (57.7).

Sereno (Stainless Steel Tank) also gives the most score per rupee, so there is no trade-off between quality and price here.

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