This is the best-reviewed and most-reliable adjustable hot glue gun.

Features:

1. Easily adjusts from low temperature to high temperature 100°C to 220°C (212°F – 428°F) to use with any glue stick
2. Non-clogging, non-dripping precision copper nozzle (also interchangeable)
3. 110W power with only 3-5 minute warm up time
4. Large “ready” light illuminates when set temperature is reached
5. Uses standard full-sized 7/16″-1/2″ (10.8mm-12.5mm) glue sticks (sold separately)
6. Automatic over-heat protection
7. Works with 100-240V 50-60Hz power