For family 4-5 person Warranty : 5 Years (on-Tank) Tank Volume- 200 LPD Inner Tank material- Stainless Steel (SS-316) Inner Tank Thickness : 0.8 mm Special Protection : Sacrifical Anode Rod for fighting water hardness Outer Tank Material - Galvanized Power coated No of tubes -20 Can handle upto 1000 ppm of water hardness