You won’t throw away the used oil filter again when you discover this brilliant idea!

Did you know that a simple used oil filter can become an effective and economical home stove? With a little ingenuity and accessible materials, it is possible to build a heating system by reusing this automotive element that is normally discarded.

Here’s a step-by-step look at how to use an oil filter as a base for a portable mini stove.

Why use an oil filter?

The oil filter is an excellent choice for this type of project for several reasons:

• It is made of rolled steel, which makes it strong and resistant to high temperatures.
• Its cylindrical and compact shape allows heat to be concentrated and distributed efficiently.
• It is an economical and ecological way to reuse automotive waste, avoiding the purchase of new metal materials.

Materials Needed

• 1 x used oil filter (previously cleaned and opened)
• 1.5 to 2 meters of thin copper tube (outer diameter between 6 and 8 mm)
• Dry sand or coarse salt (acts as thermal insulation)
• Heat-resistant metal or ceramic base
• Heat source: this can be a flame (lighter, alcohol, gas) or an electrical resistance
• Optional: heating element or nichrome cable

Step-by-step preparation

Step 1: Filter Preparation

Use a grinder or hacksaw to cut off the top of the oil filter. Then, remove the paper cartridge from inside and thoroughly clean the metal casing with a degreaser, followed by soap and water. Make sure to leave only the metal frame.

Step 2: Preparing the Copper Spiral

Take the copper tube and carefully roll it into a flat, spring-like spiral. The diameter of this spiral should be slightly smaller than the inside of the filter so that it fits without difficulty. If you’re using it to heat air, seal one end of the tube.

Stove Assembly: Two Options

Option A – Thermal convection stove (without electricity)

1. Insert the copper coil into the clean oil filter.
2. Place the filter on a heat-resistant base, such as a refractory brick or ceramic slab.
3. Apply heat from below with a lighter, alcohol candle, or small gas stove.
4. The copper will absorb and transmit the heat to the metal body of the filter, which will radiate the heat into the environment.
5. For greater efficiency, you can place a small fan that disperses the hot air.

Option B – Electric Stove with Resistor

1. Place an electrical resistor (or nichrome wire) wound inside the copper coil.
2. Attach the coil inside the filter with ceramic insulation or a suitable metal base.
3. Fill the space around the spiral with dry sand or coarse salt, leaving the spiral exposed in the center.
4. Connect the resistor to a controlled power source (it can be 12V or 220V, depending on the design).
5. The coil is heated 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, either by combustion or electricity, and quickly transfers it to the steel filter. The metal body acts as a thermal chamber, conserving and distributing heat efficiently.

If combined with a filler such as sand or coarse salt, the system can retain heat longer, even after the fountain is turned off.

With creativity and caution, it is possible to transform an unused object into a useful tool for cold days. In addition to reducing waste, you will get a practical, economical and portable heat source!