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You can purchase candy or candle thermometers at a cooking or craft store. If you do not have a candy thermometer, you can also use a meat thermometer. Just remember that wax can be hard to remove. Paraffin wax should be melted until it reaches between 122 and 140F (50 and 60C). Soy wax should be melted until it reaches between 170 and 180 degrees (76.6 and 82.2C). Beeswax should be melted until it reaches roughly 145 degrees (62.7C). You can go a little bit higher but try not to exceed 175 degrees (79.4C). Old candles should be melted at around 185 degrees (85C). Remove the old wicks with tongs.
Use a thermometer to keep an eye on the temperature of the wax.