GTC-47 is low pressure system,it is very economically and easy installation,it widely used in middle east and asia country. Features: 1) Easy installation and simple working principle without failure 2) Can be adopt mechanical and electric automatic control system 3) Long time for hot water preservation 4) Economic and widely used in domestic hot water 5) Full stainless steel for long life Specifications: 1) Material: inner tank: SS304 2B food grade 0.41mm, out tank: SS304 BA food grade 0.31mm 2) Tank diameter: 420, 460, 470mm 3) Assistant tank available with size from 21 to 25cm 4) Tank capacity: 100 - 300L 5) Max. working pressure: 0.8 Bar 6) Adopts GTC M series high efficiency vacuum tube 7) Tube size: 47/1,500mm, available from 15 to 36 tubes