Kanthal is for wattage only. You would need titanium or nickel coils for temp control. When I bought my Evic vt kit, it came with a nickel coil and a titanium coil (one was pre-installed in the tank). Make sure you're using the right mode with your coils. If you do use the temp control coils, make sure you lock in the resistance, as nickel increases resistance as the temp goes up.