Which Laser Chiller Should You Buy? (And What to Avoid at All Costs)

The chiller is the most overlooked part of a CO2 laser setup — and getting it wrong is one of the most expensive mistakes you can make. Not because a chiller costs a lot (though the good ones aren't cheap), but because the wrong one silently kills your laser tube over time, and you won't realise it's the chiller's fault until you've replaced the tube.

Cooling is one part of a bigger picture — if you're still working out how a CO2 laser does what it does, our explainer on how laser engraving works covers the fundamentals.

This guide covers every option: what to buy for a single machine, what we run on our dual-machine setup, what to avoid entirely, and how to set it up correctly once it arrives.

Why cooling matters more than most people think

A CO2 laser tube generates heat every time it fires. That heat goes into the cooling water that circulates through the tube. If the water temperature creeps up during a long job, the tube runs hotter than it should. Do that repeatedly over weeks and months and you're shortening the tube's life significantly.

The goal isn't just to cool the water — it's to maintain a constant temperature regardless of how long the machine has been running or what the ambient temperature in the room is. That distinction matters, and it's the difference between the right chiller and the wrong one.

We run both machines at a constant 18°C. Winter, summer, a two-hour job or an eight-hour day — 18°C. That consistency is a significant part of why our tubes average 13 months of commercial life rather than the six months you'll read about from people running inadequate cooling.

The one to avoid: anything with CW-3000 in the name

This is the most important thing in this post. Do not buy a CW-3000.

The CW-3000 is not a true chiller — it's a recirculating cooler. It reduces the water temperature somewhat, but it cannot hold the water at a fixed setpoint. On a warm day, or during a long production run, the water temperature will climb without any warning. Over time that degrades the tube faster than almost anything else.

Many Amazon listings bundle CW-3000, CW-5000 and CW-5200 together as variants on the same page. Do not accidentally order the CW-3000 thinking it's equivalent. This type of listing is the trap — look carefully at which variant is selected before adding to basket.

What you actually want: a CW-5200

The CW-5200 series uses a compressor to actively cool the water to your set temperature and hold it there, regardless of ambient conditions. That's what you need.

For most people: a CW-5200 compatible chiller

If you're running a single CO2 laser for business or serious hobby use, you don't necessarily need the S&A branded unit. This CW-5200 compatible chiller (6L, 220V, rated for 50W–130W CO2 tubes) is what the majority of single-machine owners should buy. It does the same job at a lower price point, and for most applications it's exactly what's needed.

If you want the branded unit: S&A CW-5200TH

S&A is the original manufacturer and has built a strong following in the laser community — and for good reason. Their machines are well built, consistent, and widely trusted. The S&A Genuine CW-5200TH (7L, Thermolysis type, rated for 60W–150W) is the one to buy if you want the brand name and the peace of mind that comes with it. It looks similar to the compatible units — and arguably performs similarly too — but the S&A reputation is genuine and their after-sales support is better.

Both options are significantly better than the CW-3000. The choice between them comes down to budget and whether the S&A name matters to you.

Our setup: dual-machine S&A

We run a specialist S&A chiller that handles both our machines simultaneously — it's not a standard consumer unit and isn't widely available, but worth mentioning because it shows what's possible at commercial scale. If you're running two machines and want to simplify your cooling setup, S&A do make dual-output units — worth contacting them directly if that's relevant to you.

How to set the temperature — and what to set it to

We run at 18°C. Most manufacturers recommend somewhere between 15°C and 20°C for CO2 tubes. Too cold and you risk condensation on the tube in warm weather; too warm and you lose the benefits of proper cooling.

18°C is a safe, stable setpoint that works year-round in a UK workshop. Set it, leave it, don't change it.

Setting the temperature correctly on a CW-5200 is not immediately obvious from the manual. This video walks through it clearly — it's not ours, but it does the job well:

How to set the temperature on a CW-5200 chiller (YouTube)

Other chiller tips

• Use distilled or deionised water only. Tap water deposits minerals in the tube over time. Distilled water is cheap and available everywhere.
• Check and top up the reservoir regularly. Low coolant reduces flow and raises temperature. Takes thirty seconds to check.
• Protect it from frost. If your workshop drops below freezing in winter, either drain the chiller or use an appropriate antifreeze additive. Frozen coolant can crack a laser tube.
• Allow it to reach temperature before starting the laser. Give it five minutes to stabilise, particularly on a cold start in winter.

See our setup before you buy

Our full laser setup — including both chillers — is running at our showroom in Buckley, North Wales. Come and see how it's all configured before you commit. When you're ready to order your machine, our OMTech discount code saves you 4%. And our hands-on training course covers the full setup including cooling — in person or by video call.

For everything else about setup before your machine arrives, read the pre-delivery setup checklist.

Disclosure: Amazon links in this post are affiliate links — we earn a small commission if you buy. The CW-3000 link is included as a warning only; we do not recommend this product. All other recommendations are based on genuine commercial use.