... ,15 years lifetime. 3. OEM service Compact SS Solar Water Heater high qualityDENO Compact Non-pressure ... system doesn't need any power, green and economic.4. Easy install, easy operation, fashionable.5. Well ... with painting,or Aluminium alloy, or stainless steel.4. Water tank heat insulation layer: 50~60 mm ... . Magnesium bar: protect inner tank to be corroded.4. Quality Certificate: ISO: 9001:2000, CE.5. ...