Work "brass" be great heat, circulating cooling water needed, so the default shipping transparent pipes with an inner diameter of 2 meters of 4mm, the proposed buyer to buy a small low voltage pumps, such as the aquarium, the kind of small tea pumps can be. No pump can also access the faucet, take a bucket or high self-discharge water. If you do not add water cooling may also be used, but be burned black brass, it not have much impact. Found with a 36V power supply completely into the new 30 * 30 graphite crucible input current of 25A Found molten aluminum Power Requirements: 24V 350W - 500W power supply (15A to 20A) [melting point: 660 ] Found melting copper, gold, silver, power requirements: 36V 700W - 900W power supply (20A to 25A), respectively [melting point: 1083 , 1065 , 962 ] Uses: DIY small parts made of steel hardening, annealing below the melting point of 1100 metal smelting, DIY small cooker and so on. Notice: Only direct heating a steel material ( the magnet can be adsorbed material) Gold, silver, copper, aluminum can not be directly heated, need to match the graphite crucible melting, Work brass heating need to use a lot of water circulation cooling,Without water circulating cooling are possible, but burn into a black brass, it not be much affected. The appearance may be slightly different due to different factory batches, but it not affect the use Colour:Black Material:plastic Package Contents: 1set x ZVS Induction Heating Board Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.