What Gauge Copper for a Still? Thickness, Weight, and the Honest Tell
The CopperHolic Team
For a home copper still, the answer is about 1 mm of copper. Thinner than roughly 0.6 mm and the pot dents easily and develops hot spots; much past 1.2 mm you are paying for commercial weight a home burner does not need. Around 1 mm, sometimes labeled 18 gauge or 32 ounce, is the solid home standard, and it is what our stills are hammered from.
The confusing part is the labels. Copper sheet gets sold by gauge numbers, by ounces per square foot, and by millimetres, and sellers quote whichever sounds best. Here is how to read them, and the one number that never lies.
TL;DR
- Quick answer: about 1 mm copper for the pot. It is the balance of dent resistance, even heating, and sane weight.
- Label soup: ~1 mm ≈ 18 gauge ≈ 32 oz copper. Under 0.5 mm is decor-grade, whatever the listing calls it.
- The honest tell: shipping weight. Thin copper cannot weigh much.
- Also check: lead-free solder and whether it arrives assembled or as a flat kit.
Gauge, ounces, millimetres: the same question in three languages
| Label you will see | Roughly in mm | What it means in practice |
|---|---|---|
| Under 0.5 mm (26+ gauge, 12–16 oz) | 0.3–0.5 | Decorative. Dents under a thumb, scorches over a burner. |
| 20–22 gauge / 16–24 oz | 0.6–0.8 | Light duty. Workable for small stills, feels flimsy at 5 gallons. |
| 18 gauge / 32 oz | ~1.0 | The home standard. Rigid, heats evenly, lasts decades. |
| 16 gauge and up | 1.2+ | Commercial weight. Heavier and slower to heat than a home setup needs. |
Gauge systems vary slightly between charts, which is exactly why we suggest asking any seller for the thickness in millimetres. A seller who knows their product answers instantly.
Why thickness matters most at the base
The pot base takes the flame. Thin copper there means hot spots, and hot spots scorch botanicals, which you taste in the result. Thicker copper spreads heat evenly, holds its shape when a full pot is lifted, and gives solder seams a solid footing. The head and swan neck carry only vapor, so the base and lower pot walls are where the material budget belongs, and where cheap stills save it.
The honest tell: weight
Copper has a fixed density, so thickness shows up on the scale whether the listing admits it or not. Our 5 gallon still weighs about 22 pounds; the 5 litre is around 10 and the 10 gallon around 45. If a "copper" still of similar size ships at a fraction of that, the metal is thin, the parts are partly not copper, or both. When a listing hides both the thickness and the weight, that is your answer.
Hammered vs stamped at the same thickness
Two sheets of 1 mm copper are not automatically equal. Hammering work-hardens the metal, so a hand-hammered wall is stiffer and more dent-resistant than a factory-stamped one of identical thickness. The hammer marks on an alembic are not decoration on top of the craft; they are the craft. Stamped stills skip that step, and flat-pack kits go further, shipping thin panels you solder yourself.
What we build with
Every CopperHolic still is hammered from 1 mm pure copper sheet, seamed with 100% lead-free silver alloy solder, and arrives fully assembled: pot, onion head with thermometer, swan neck and coil condenser, nothing to solder. That combination, 1 mm, silver solder, assembled, is the checklist we would use shopping anywhere, including away from us. Our USA buying guide applies it across the market.
FAQ
Is thicker always better?
Up to a point. Past about 1.2 mm you gain little at home scale and pay in weight, heat-up time, and price. 1 mm is the sweet spot for 5 litre to 10 gallon stills.
What gauge for a moonshine still?
The same answer, about 1 mm, and the same physics. One note if spirits are your interest: US federal law and many states restrict distilling alcohol at home, so read our plain-English legal guide before planning around it.
How can I check thickness on a still I already own?
Weigh it and compare against its size class, or measure the rim edge with calipers. The rim and the base should feel rigid, not springy, under hand pressure.
Does the condenser coil need to be the same gauge?
No. The coil carries vapor and cooling water, not flame, so tubing is judged by being pure copper and cleanly formed rather than by wall thickness.
If you are comparing stills right now, start with the size guide to fix the capacity first, then apply the 1 mm checklist to whatever you shortlist. The full range of 1 mm hand-hammered stills is in the copper alembic stills collection.