Comment by periblepsis on Heater circuit using series resistors

@Anonymous Here's a picture of that power dissipation curve as one resistor gradually increases in resistance. I just had to replace 0000 aluminum wiring (in the ground) that had rapidly increased into failure for similar, though more extreme, reasons. In the curve, one can see that dissipation rapidly increases, very early on. The 2 W rating is exceeded quite quickly.