Making my own heater coil
The reason you don't find larger heaters than 1500 w is the max load for a 15 amp circuit. Going to a 20a 120v circuit can get you to the range you want these industrial heat guns are quite expensive but are out there and much safer than building one because they have built in safetys and the proper heat &amp; electrical insulation / insulators to prevent a fire. But most do use nicrome wire as the heat source.