... depend on consumers’ needs)Accessory(optional): 1.Assistant tank water supply control pressured,5L 2.Electrical heater:1. ... ,digital control displayFeature:The system consists of solar vacuum tube, water tank, assistant tank, copper coil, electrical right bracket (optional), ... stand.High quality SUS304-2B stainless steel for water tank, processed by argon arc welding technique, under strict quality ...