On 12/01/2021 20:21, Tim Lamb wrote:
In message , ARW
writes
https://youtu.be/658eoX3ERAs?t=1500
I'm too idle to watch it all.

The company I was training at as a technician apprentice had a nice line
in producing low voltage transformers used to pass a current through
buried frozen water pipes:-)

Wouldn't do much with blue poly now!

Perhaps you could use High Voltage instead. Ice is the poorer conductor
wrt water, so power would be dissipated in the ice preferentially, ideal
really.