... Pressurized and non-pressurized We are a professional solar water heater manufacturer with ISO and CE certificate in Changzhou, ... board:galvanized steel ,thickness:0.5mm* Heat-Preservation Layer : By polyurethane,thickness 50mm* Water Inlet and outlet: NTP3/4* Electrical heater ... valve,sacrificial anode,pollutant-resistance valve* Diameter of water tank:100L inner diameter: 368mm, outer diameter:450mm ...