Double Wax Warmer This professional double wax warmer can heat up to 28 oz. of wax. The estheticians in your salon or spa need a steady supply of wax that’s been heated to the exact optimal temperature -- so why not get them a unit that prepares two pots at once, even at two different temperatures! Shop with confidence for this salon wax warmer that gets the consistency and temperature of your wax just right, every single time.