GTC engineering provide project solar water heater (low pressure), it widely used for domestic hot water (DHW), pre-heating and etc in different fields. The system compose by one manifold with 50 vacuum tubes,60 tubes, of dia.47 or dia.58. Frame by galvernized steel of 3×3cm with 2.8mm thickness. The system can be made by passive system or active system according to the tank installation. The tank volume can be from 200L to 5 tons, we sugguest for active system.