1) Your milk boiler is made of high quality double walled stainless steel. Please use as below. 2) Unscrew the whistle, slant the vessel and use the plastic funnel and pour water between the 2 Layers of your SS milk boiler. 3) Affix the vessel and pour milk into the boiler and use over LPG Stove 4) Please check water level and restore the water level everyday. 5) If the milk boiler is used without pouring in water between the walls, It will blacken because only the outer layer will get heated. Kindly follow this procedure.