Sand battery heater

[leon.davibe]

What happened? I'm guessing the heating element housing couldn't provide enough insulation and the cable sleeving started melting?

yea geyser element is designed to be submersed if not they explode or melt
you need an element desined not to be in water like a oven element that can actually handle the heat
it will actually last better in sand as air is the worst medium for heat transfer