water heater tank With high pressure resistant design, the water tank adopts the water tank adopts SUS304-2B or SUS316L stainless steel, and special welding technology. Its thickness is 1.2mm - 2.0mm. And directly connected to pressurized water supply is permitted. The pressure resistance capability is 6 bar, if the data exceeds, the exclusively-used P/T valve will bereleased. The P/T valve, with the brand name CALEFFI,is qualified to EN1115. Qualified to TUV safety standardization, the water tank has dual insulation functions. The temperature controller adopts American "Therm O-Drsc" one, qualifying to VDE standardization. The super long and big magnesium stick can protect the tank free of scale. The long enough exchange copper tube(14) assures very high exchange efficiency in solar system. The outlet of copper adopts special copper, good in sealing performomce and easy to install.Product model200L300L400LInner bessel diameter (mm)480480630Water tank diameter(mm)540600750Material thickness of the inner SUS304-2B1.2mmSUS304-2B1.2mmSUS304-2B2.0mmMaterial and thickness of the shell Pearlescent plate0.5mmPearlescent plate0.5mmPearlescent plate0.5mmInsulation thickness(mm)506060Surface area heat exchanger top (m2)0.40.40.5Surface area heat exchanger bottom (m2)0.60.70.8Installation size of water pipeNPT3/4NPT3/4NPT3/4Rated heating power2.0KW2.0KW2.0KW