TEC 820 is an excellent medium duty glue gun that will satisfy many applications. The TEC 820 has an adjustable thermostat and dispenses up to 5.5 pounds of hot melt per hour making it a very productive gun. The TEC 820 glue gun only takes 2-3 minutes to warm up! The trigger adjuster allows you to change the amount of glue per trigger squeeze. Operating temp 266-392F.