This converted chest freezer is an ideal size for heating up five gallon buckets of honey. Ideal for honey that has crystalized and needs reliquefying, this type of heater will do the job. The freezer used measures 19" deep by 30" wide by 28" high (these are all outside dimensions of the chest not including the lid or base) and is the type used in ice cream shops. Find a size that will work for your needs and that costs little to nothing.
Honey Heater Plans - Chest Style - 1 page PDF file