... CCC,certificates, can install anywhere, offer OEM. Product Description Heat pipe solar water heater, Pressurized type CCC,ISO9001,CE Specification: ... 520mm 5. Insulating layer thickness: 55-60mm polyurethane 6. Heat pipe tube, no water inside 7. Back-up electric heater 1-3Kw ... .8. Digital controller optional 9. Heat pipe tube: High quality tri-elements coating tube(ALN/ALN-SS/CU), this coating is ...