How to Assemble a Copper Pot Still: A Step-by-Step Walkthrough

Every run starts long before the first drop. It starts on a workbench, with copper parts laid out in a row and a torch you haven't lit yet. Putting a pot still together is your first experiment. You control the heat, you watch the metal, and you find out with your own eyes whether a joint is sound. Take your time with it and you'll understand your still better than any manual could explain it.

This walkthrough covers the general order most builders follow with a copper pot still, especially a you-solder kit. Your kit's own instructions always come first. If anything here disagrees with them, follow the kit.

Step 1: Get to Know Your Parts

Open everything and lay it out on a clean surface in the order the vapor will travel. A typical copper pot still breaks down like this:

• The pot: the boiler where your wash or water heats.
• The cap: sits on the pot and gathers rising vapor. On EZ KIT models this is the EZ Seal Cap.
• The vapor line: carries vapor from the cap toward the next stage.
• The thumper (optional): a second vessel some builds use between the pot and the condenser. Many EZ KIT models include a thumper port for this.
• The condenser or worm: a copper coil where vapor cools back into liquid.
• Fittings and connectors: the small pieces that join everything together.

Check each piece against the parts list that came with your kit. Do it now, while it's easy, not halfway through with a hot torch in your hand.

Step 2: Set Up a Safe Workspace

Soldering copper means open flame and hot metal, so set up before you start:

• Work somewhere with good airflow. Outdoors or in an open garage is best.
• Use a fire-safe surface and keep anything flammable well away.
• Wear safety glasses and heat-resistant gloves.
• Keep a fire extinguisher and a bucket of water within reach.

Gather your tools too: a torch, flux, solder, fine sandpaper or emery cloth, a wire brush, clean rags, and something to hold parts steady while they cool. For a still, use silver solder made for copper. Stay away from anything containing lead. A 1 lb. Roll of Silver Solder gives you plenty for a full build, with some left over for repairs.

Step 3: Dry-Fit Everything First

Before any heat touches the copper, put the whole still together without solder. Slide each fitting into place and look at the result. Do the joints seat fully? Does the vapor line run where it should? Does the condenser sit at a height that works with where you plan to collect?

This is your blueprint stage. A good scientist checks the setup before the experiment begins. Mark each joint with a pencil so you can line it up the same way later. Then take it apart again.

Step 4: Clean the Copper Until It Shines

Solder sticks to clean metal and nothing else. Oxidation, oil from your fingers, and shop dust will all ruin a joint. Rub the outside of each pipe end and the inside of each fitting with emery cloth until you see bright, pinkish copper. Wipe away the dust with a clean rag.

Once a surface is clean, keep your fingers off it. Clean only what you'll solder in the next session so fresh oxidation doesn't creep back in.

Step 5: Flux, Heat, and Let the Solder Flow

This is where the alchemy happens. Brush a thin, even coat of flux on both mating surfaces and press the joint together at your pencil marks.

1. Heat the fitting, not the solder. Move the flame around the joint so the copper warms evenly.
2. Watch the flux. It changes as the metal comes up to temperature. That's your signal.
3. Touch the solder to the joint, away from the flame. If the copper is hot enough, it melts the solder and pulls it into the gap by capillary action. You'll see a bright line of silver run all the way around.
4. Stop when the ring is complete. More solder doesn't make a stronger joint. It just leaves drips.

Let each joint cool naturally without bumping it. Moving a joint before the solder sets is the most common cause of hidden leaks.

Step 6: Clean Off the Flux

Flux residue left on copper can keep working on the metal long after you put the torch down. When the joints are cool, scrub them with warm water and a brush, inside and out wherever you can reach. Rinse well. A clean build now means an easier first water run later.

Step 7: Assemble in the Order the Vapor Travels

Work from the bottom up, following the path the vapor will take:

1. Join the cap and its connections so it seats properly on the pot.
2. Attach the vapor line to the cap.
3. If you're running a thumper, connect the vapor line to it, then run the line from the thumper toward the condenser.
4. Connect the condenser or worm last, making sure the outlet is open and easy to reach for collecting.

Keep the vapor path free of low spots where liquid can pool. Most of all, never build anything that closes the system off. A still has to stay open to the air through the condenser outlet. Pressure that can't escape is dangerous.

Step 8: Choose and Set Up Your Heat Source

A still needs steady, controllable heat. Many builders use a Propane Burner for 6 Gallon to 30 Gallon Sized Copper Distillers. Others like the precision of an electric option, like the 110v & 220v Electric Heating Element W/Controller. Whichever you pick, set the pot on a stable, level surface with plenty of clearance, and run propane setups outdoors only.

Step 9: Leak-Test With a Water Run

Before you run anything else, run plain water. Fill the pot partway with clean water, seal the cap, start your condenser cooling, and bring it up to heat slowly. Then watch:

• Look at every soldered joint for wisps of steam or drips.
• Check that the cap seats evenly and holds.
• Confirm that condensed water flows freely out of the condenser outlet.

If you find a leak, shut off the heat and let everything cool completely. Drain the still, clean the joint again, and reflow it. A water run also rinses out leftover flux and shop grime, so it does two jobs at once.

Step 10: Know the Rules Before You Run

Owning a copper still is legal in the United States, and people use them to distill water, extract essential oils, and, with a permit, make fuel alcohol. Distilling alcohol for drinking requires federal permits from the TTB, and your state and town may have their own rules. Always follow federal, state, and local law.

Want to Build It Yourself?

If this walkthrough has you itching to pick up a torch, a you-solder kit is a great place to start. The EZ KIT Advanced Model with EZ Seal Cap and 4 inch Thumper Port You Solder Copper Moonshine Kit puts the build in your hands, from the first clean joint to the first water run. Questions before you start? Call the family shop in New Hampshire at 603-997-6786.