For family 10-15 person Warranty : 5 Years (on-Tank) Tank Volume- 500 LPD Inner Tank material- Stainless Steel (SS-316) Inner Tank Thickness : 0.8 mm Special Protection : Sacrifical Anode Riod for fighting water harness Outer Tank Material - Galvanized Power coated No of tubes -34 Can handle upto 1000 ppm of water hardness