Oxygen Concentrator vs Tanks for Lampworking: Which Supply Should You Run?

Short answer: An oxygen concentrator pulls oxygen from the room air, so there are no refills, no heavy cylinders, and no ongoing oxygen bill — but a single unit has a hard ceiling on how many liters per minute (LPM) it can deliver, and purity tends to drop as you push it to its top flow. Compressed oxygen tanks (cylinders) give you high flow and high purity on demand, but you pay for refills or exchanges, you handle and store pressurized gas, and you need the right regulator. Most home lampworkers start with a concentrator; people running hungrier torches plumb two or more concentrators in parallel, or move to tanks. The right answer is whatever comfortably feeds the torch you actually intend to run.

This is the supply decision that sits behind your whole setup, so it’s worth getting right before you spend on a torch. It’s the third of the four questions in our glass torch buyer’s guide.

How torch oxygen demand (LPM) drives the decision

Every flameworking torch consumes oxygen at some rate, measured in liters per minute (LPM). Small detail and bead torches sip; large multi-stage boro and production torches gulp. Your supply has to meet or exceed the torch’s appetite at the flame size you want to run — if it can’t, a powerful torch simply runs poorly, with a lazy, cool, or sputtering flame.

That’s why we say repeatedly across this site: a torch is only as good as the oxygen feeding it. The smart order of operations is to decide your oxygen reality first, then pick a torch that thrives on it — not buy a monster torch and discover it starves on a single concentrator. Source: Mountain Glass.

One important caveat about specs: many torch makers publish a recommended oxygen LPM, and our own catalog carries an oxygen_recommended_lpm field. Treat any single published number as a starting point, not gospel — the figure depends on flame size, fuel pressure, and the specific configuration, and a lot of community-circulated numbers are unverified. Always confirm your exact torch’s oxygen requirement with the manufacturer before sizing a supply around it.

Oxygen concentrators for lampworking

An oxygen concentrator is an electric appliance that draws in room air, strips out nitrogen through molecular-sieve beds, and delivers a stream of concentrated oxygen. Crucially, it makes oxygen continuously, so you can flamework as long as the machine is running without ever buying gas. Source: Using a DME Oxygen Concentrator for Lampworking.

Flow ceiling and the purity-at-max-flow tradeoff

The catch is flow. Common artist-grade concentrators are rated around 5 to 10 LPM, and the oxygen purity they deliver tends to fall as flow rises toward the unit’s ceiling. A unit may hold roughly 90%+ oxygen comfortably below its rated max and then drop noticeably as you demand its top flow. For glasswork you generally want 90% or better — low purity gives a cooler, less stable flame. Pushing a unit past its design flow can also empty its internal holding tank as the sieve beds cycle, which shows up as flame fluctuation. Source: Lampwork Etc., “Oxygen Concentrators”.

Plumbing several concentrators together

When one unit isn’t enough, lampworkers commonly plumb two or more concentrators in parallel to add their flows together — for example, two 5 LPM machines combine for roughly 10 LPM of supply. There’s an important limit, though: combining units increases volume (flow), not pressure. Concentrators are low-pressure devices (only a few PSI at the outlet), and you can’t simply crank the pressure up — raising pressure or pushing more than the manufacturer intends can hurt purity and can damage the sieve beds over time. Source: Lampwork Etc., “Oxygen Concentrators”.

Electrical, noise, heat, and cost

Each concentrator is an appliance that draws real power, generates heat, and makes a steady compressor hum — running several in a small studio means planning for circuits, ventilation, and noise. The upside is the cost model: concentrators are an upfront purchase with essentially no ongoing oxygen cost (just electricity and the occasional maintenance), which is exactly why home studios favor them. Many machines on the market are refurbished medical units; condition and sieve-bed health matter, so buy carefully. Source: Lampwork Etc., “Oxygen Concentrators”.

A real bonus: concentrators are low-pressure and unregulated — no pressurized cylinder sitting in your studio, and even at full output a single unit can’t flood a room fast enough to create a serious explosion hazard the way a leaking high-pressure cylinder could. Source: Using a DME Oxygen Concentrator for Lampworking.

Compressed oxygen tanks and cylinders

Compressed oxygen cylinders are the traditional, industrial supply: high-pressure steel or aluminum bottles of welding- or medical-grade oxygen. They come in a range of sizes, commonly referred to by letter or cubic-foot ratings — from small portable bottles up to tall “K”/250-cu-ft cylinders that stand chest-high.

Flow and purity

This is where tanks shine. A cylinder with a proper regulator can deliver high flow at high, consistent purity, on demand, with no warm-up and no purity sag as you open the flame up. For a big multi-stage torch run wide open, nothing keeps up as effortlessly as adequately sized cylinders or bulk oxygen. Source: The Crucible.

Refill and exchange logistics

The tradeoff is ongoing cost and logistics. You either refill or exchange cylinders at a gas supplier, which means transporting heavy bottles, paying per fill, and sometimes leasing the cylinder itself. A hungry torch can drain a bottle surprisingly fast, so production artists either keep large cylinders, run banks of them, or step up to bulk/liquid oxygen. Some artists even use a concentrator or compressor to refill their own bottles. Source: The Crucible.

Safety, storage, and regulators

Cylinders are high-pressure devices and deserve respect. You’ll need the correct oxygen regulator (never improvise), and the cylinder must be secured upright so it can’t fall — a knocked-over cylinder with a sheared valve is genuinely dangerous. Store and use cylinders in ventilated space, away from heat and from any source of oil or grease (see safety section below).

Concentrator vs tanks: side-by-side comparison

Sources: Lampwork Etc., DA Clarke, The Crucible.

Guidance by torch size

The clean way to think about this is to match the supply to the torch’s appetite — and the torch’s mix type and stage count are good proxies for that appetite. Small single-stage torches are modest; large multi-stage surface-mix production torches are thirsty. (If you’re weighing flame types, see surface mix vs premix torches.)

• Small / beginner torches (e.g. a minor-class bench torch or a small surface-mix starter): these generally run happily on one, or at most two, concentrators. This is the classic home-studio setup — a single machine, no cylinders, and you can work as long as you like. A popular versatile mid torch is well known for running efficiently on a single ~5 LPM concentrator, which is exactly why it’s such a common first “real” torch. Confirm your specific model’s recommended LPM with the maker, but small torches are the sweet spot for concentrators.
• Mid-size torches: often a two-concentrator setup, or a modest cylinder, depending on how big you run the flame. This is where people start plumbing units in parallel.
• Large / surface-mix production torches: big multi-stage boro and production torches can demand far more oxygen than a single concentrator delivers. Here you typically need compressed tanks, bulk oxygen, or a bank of several concentrators plumbed together. Trying to feed a large production flame from one concentrator just won’t work.

Source: Mountain Glass.

Notice we’re speaking in ranges and unit counts, not exact per-model LPM numbers. That’s deliberate: published oxygen figures for specific torches are frequently unverified, and the real draw depends on your flame size and fuel pressure. Get your torch’s oxygen spec from the manufacturer, then size your supply with a little headroom.

Safety notes (accurate, not alarmist)

Oxygen itself doesn’t burn, but it makes everything else burn far more violently — which is why a few rules are non-negotiable:

• Keep oil and grease away from oxygen. Oxygen plus petroleum-based oil or grease can ignite violently. Never lubricate oxygen fittings, regulators, or threads with oil; use only oxygen-compatible components and clean hands/rags.
• Secure compressed cylinders upright with a chain or stand so they can’t be knocked over.
• Ventilate your workspace — both for combustion byproducts/fumes and to avoid letting oxygen build up in an enclosed space.
• Use the correct regulators and flashback arrestors, and leak-check every connection. (Flashback arrestors belong on both the fuel and oxygen lines — see the buyer’s guide.)

This article informs your decision; it does not replace the manufacturer’s instructions or advice from a qualified professional for your specific setup.

Key takeaways

• Match the supply to the torch’s LPM appetite — decide oxygen first, then choose a torch that thrives on it.
• Concentrators: no refills, low pressure, safe and convenient for home studios — but limited LPM per unit and purity can sag near max flow.
• Tanks: high flow and high purity on demand — but ongoing refill cost, heavy handling, and high-pressure safety to manage.
• Hungry torches get fed by tanks, bulk oxygen, or several concentrators plumbed in parallel (which adds flow, not pressure).
• Don’t trust a single published LPM number for your torch — confirm it with the manufacturer and size with headroom.

Sources

• Lampwork Etc., “Oxygen Concentrators” — https://www.lampworketc.com/forums/archive/index.php/t-245238.html
• DA Clarke, “Using a DME Oxygen Concentrator for Lampworking” — https://www.daclarke.org/ArsBrevis/oxyBoxen.html
• Mountain Glass, “Best Torches for Lampworking or Glassblowing” — https://www.mountainglass.com/best-torches-for-lampworking-or-glassblowing
• The Crucible, “Lampworking/Flameworking tools & supplies” — https://www.thecrucible.org/guides/lampworking-flameworking/tools-supplies/

Editor’s note: oxygen-supply behavior and torch demand reflect community and dealer information as of 2026; verify your specific torch’s oxygen requirement and your local gas-supply options before buying.