Porcelain Enamel Tank - is a trusted & proven technology for inner tank of water heaters. Used widely across the world, it is ideal for long life & trouble free performance in all kinds of water. More than 95% of water heaters produced worldwide are with enamel tanks. Corrosion protection is very good due to fusion of glass layer to metal.
Polymer Tank - this technology is very similar to powder coating & is developed by paint suppliers. It is not widely used and is not approved by BIS for use in water heaters. Corrosion protection is limited by the adhesion of the coating to the metal.
Stainless Steel Tank - this is an outdated technology that manufacturers are moving out of now. Corrosion protection is very poor, particularly in hard water and due to poor welding quality.
|SL||Description||Enamel Tank||Polymer Tank||SS Tank|
|1||Protection Coating||Porcelain Enamel||Polymer-powder coating||-|
|2||Coating Type||Inorganic||Organic - powder coating||None|
|3||Coating Thickness||250 - 400 microns||150-200 microns||None|
|4||Coating Adhesion||Fused with metal||Similar to powder coating||None|
|5||Baking Temperature||850 deg C||200 deg C||-|
|6||Life of the Coating||Long life||Limited life||-|
|7||Usage||Widely used Internationally||Limited. In very few countries||Limited. In very few countries|
|8||Material||Mild Steel||Mild Steel||Stainless Steel|
|10||Rated Pressure||8kg/cm2||8kg/cm2||3kg/cm2 & 6kg/cm2|
|11||cathodic protection||Magnesium Anode||Magnesium Anode||-|
|12||Hard water Suitability||Good||Average||Poor|
|14||Hot Water resistant||V.Good||Average||V.Good|
|15||Approved Quality Standards||BIS, IEC, DIN & UL||Nil||BIS|