Specifications: For family of 10-12person Warranty : 20 Years (on-Tank) Tank Volume- 400 LPD Inner Tank material- 1.6mm GI with Porcelain Enamel Coating Outer Tank Material - 0.45mm Powder Coated/0.4mm Stainless Steel No of tubes -34 Can handle upto 2000 ppm of water hardness Must Before Buying: Space available on terrace should be minimum : 8 feet x 7 feet Overhead Tank/Synatx should be placed minimum 8feet higher from the terrace If you have booster pump on terrace , this product is not Customer Scope: Plumbing and Electrical wiring