Found with a 36V power supply completely into the new 30 x 30 graphite crucible input current of 25A Found molten aluminum Power Requirements: 24V 350W - 500W power supply (15A to 20A) [melting point: 660 Degrees Celsius] Found melting copper, gold, silver, power requirements: 36V 700W - 900W power supply (20A to 25A), respectively [melting point: 1083 Degrees Celsius, 1065 Degrees Celsius, 962 Degrees Celsius Uses: DIY small parts made of steel hardening, annealing below the melting point of 1100 Degrees Celsius 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 working voltage: DC 24-36V working current:20A Power tube:IRFP260N (50 a 200 v) Size:100x100x85mm Spiral copper pipe size:Inside diameter 40 mm, high 45mm 100% New Colour: Black Material: CCL+METAL Note: There may be slight color difference due to different batches, but it does not affect the use Package Contents: 1 x heater 1 x copper tube 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.