Determine what type of metal you'd like to melt. Softer metals such as lead and silver require smaller pots that top out at about 2,000 degrees Fahrenheit using approximately 110 volts of electricity. Harder metals such as Tungsten require larger, industrial-sized pots that top out at well over 8,000 degrees Fahrenheit using approximately 500 volts of electricity.
Evaluate the work area where your pot will be located. Some pots are safe to operate inside a commercial residence as they are not hot to touch on the outside. Other pots require at least a 4- to 5-foot clearance surrounding them free of any easily combustible or meltable materials such as paper, wood or electronics. If you do not have much space to work with, you are limited to smaller pots that do not emit excess heat.
Test the voltage capacity of the outlet into which you plan on plugging the melting pot. Some outlets--particularly those found in older houses--will not support even the smallest of melting pots without blowing a fuse or burning out the wiring of the outlet itself. It is best to get a second opinion from a trained electrician before installing a melting pot in your house.
Contact your insurance company to determine what size pot you can install in your home without it affecting your insurance rates. Some pots, particularly larger pots, require policy adjustments to compensate for the added risk of housing such a dangerous appliance.
Evaluate the guarantees on any and all pots you consider before purchasing. Because of the nature of their function, melting pots can tend to be persnickety. While a cheaper pot might save you some money at the onset, one with a more extensive warranty program will likely save you money in the long run.