... :6 bar; 5 year warranty Solar water heater--SKI-TB : Porcelain Enamel Tank to Compacted & Pressurized solar water heaters, ISO&CE 1) Tank material ... process), T&P Valve (release over pressure), Mg Anode (purify water quality & drag dirty materials out);6) Support: Galvanized Steel, ... Titanium steel is insulated and can help preserve heat. solar water heater: porcelain enamel tank, SKI-TB, ISO&CE