GTC -58s-alu type is our new design for family and house installation,also for vila,house heating,central heating,factory,wool washing,sunna bathing,gas heater and electric back up ....etc hot water using fields,gtc Solar company can producing and design and make new developemnt according to customer's requestment and give solutions for any solar heating fields or projects.GTC-58S-ALU series can make from 15tubes to 30tubes or more,and capacity from 150L to tons .