... degree, rust&corrosion free; no poisonous metals & healthier; better heat preservation for 10 days Solar water heater: SKI-TCC : porcelain ... heating element ,T&P Valve ,Mg Anode, Sensor, Heat ExchangerManufacturing of Porcelain Enamel Tank: It is manufactured by choosing ... is insulated and can enhance heat preservation process, say it can preserve heat for 100 hours; the heat cofficient is 5-10% ...