Model: HDFQ5818-300 The Distinguishing features: 1 Split pressurized type structure 2 Heat pipe inside vacuum tube for heat transfer with big power, high efficiency, long life span(more than 15 years) 3 No water in the tube,one tube breake don't influence the system working 4 Rust-free and scale resistance;no seaming and leakage; hail resistance and anti freeze 5 High-quality anode magnesium rod stick to prevent furring 6 Non-return safety drainage valve and overpressure protective device Specifications: Water tank: Specification(D×L) (mm): 610×1585 Capacity: 300L Weight (kg): 101 Inner tank: Special procelain tank with no fouling, no rusting, no corrosion, no leakage, no shinking and healthy water Outer tank: Stainless steel (SUS304 2B) Thickness: 0.6mm Heating power (kw): 2.5 Collector: Specification (L ×W× H)(mm): 2590×2100×150 Weight (kg): 132 No. Of tubes: 30 Tube sizes:(D x L): 58 x 1,800mm, Tube absorption=0.93, heat loss= 0.07 Tube heat transfer power: 26,000kW/m2 Working pressure: 0.6MPa Optional Auxiliary Electric Booster:2.5kw ac220v50hz, constant hot water is available all the year around Optional Controller and automatic filling valve or assistant tank Running way: forcing circulation