The glowing twisted wires are quite visible in the Lugano photos. The caption of one photo suggests that the twisted leads are glowing due to conduction from the reactor, which is silly. The wires are glowing orange hot because up to 50 A are passing through them.
Correct. The heater wires all produce the same amount of heat per cm from wherever they are connected to the positive rail and back to where they are connected to the negative rail.