- Place an electrical resistor (or nichrome wire) wound inside the copper spiral.
- Secure the spiral inside the filter with ceramic insulation or a suitable metal base.
- Fill the space around the spiral with dry sand or coarse salt, leaving the spiral exposed in the center.
- Connect the resistor to a controlled power source (it can be 12V or 220V, depending on the design).
- The spiral heats up and transfers the heat to the metal filter, which acts as a radiant heat source.
How does this system work?
Copper is one of the best thermal conductors. It absorbs heat, whether from combustion or electricity, and quickly transfers it to the steel filter. The metal body acts as a heat chamber, efficiently retaining and distributing the heat.
When combined with a filler such as sand or coarse salt, the system can retain heat for longer, even after the source is turned off.
With creativity and care, it’s possible to transform a discarded object into a useful tool for cold days. Besides reducing waste, you’ll gain a practical, economical, and portable heat source!
