Water tank High performance meets the requirement of Pressure Equipment Directive 97/23/EC(CE certificate no.PCIN080617). Apply for solar thermal system and heat pumps. Highly quality stainless-steel with advanced welding and high pressure polyurethane resin forming Elegance,good corrosion resistance and long-term durability Possible heat pump operation combined with a solar heating system,with additional heat sources and threadedimmersion heaters. Features: Capacity:50L 500L. Size of exchanger:optional Operating pressure:0.7mPa Max.testing pressure:1.3mPa Max.running temperature:90oC