Mainly size and a bit of design difference.What is the difference between the glow 14 and 18? Cheers
14 is smaller than the 18. Both the unit and mouthpiece. You load the stem in the 18 while you load the atty in the 14. Both have kanthal coils installed which you should never have to change but you can if you want, including other coil materials. I run them at similar wattage too. Between 35 and 45 watts.
Fire away with anymore questions.