... .100% Aluminium 2.CCC,CE,ISO,RoHS,Solar Keymark 3.High efficiency 4.freezing resistance Heat pipe solar collector mainfold is made of 100% aluminium ... , 2X15, 2X20, 2X25, 2X30 tubes 6)Pressurized water tank: 100L, 150L, 200L, 250L, 300L, 400L, 500LTechnical data:total length (m)1 ...