Solar Hot Water Storage TanksSUNWORLD solar hot water storage tanks comes in a wide range of capacity for residential, commercial and heating systems application. Feature: • Pressurized storage tank with single/dual heat exchangers.• Copper coil heat exchanger can be collected to gas or boiler.• Electric backup included.• Durable and efficient. • The largest capacity up to 4000L for commercial application.Specification: Inner tank Inside with copper coil Solar collector for selection