... .0 KW Electric Heater,Mg Anode,T&P Valve,Single Heat Exchanger, Sensor4) Copper coil: thickness: 1mm; diameter: 16mm 5) Working ... , free from corrosion & scare, 5 years' warranty time; 3. longer heat preserving time: for 100 hours, enamel tank itselt is insulated to ...