Weller PU-2D Soldering Station

[Skywave]

The Heat input to the tip remains the same old 48W no matter which bit you use.
Alan

You sure about that? I thought that the higher the number, the higher the mean temperature was. The higher the mean temperature, the higher the mean heat input. We know that this iron uses a magnet at the remote end of the bit to operate a switch that switches the supply to the heating element on and off (magnet's Curie point). So a higher numbered bit has a greater on / off duty cycle than a lower numbered bit, resulting in the mean heat level to the bit varying accordingly: it won't be constant throughout the bit number range. Since all the bits in the range have the same mass and specific heat, the mean heat input - and thus the resultant temperature - will vary according to the bit number.

Al.