Run out of CO2 on a Friday night and you’ll know about it within minutes — flat beer, dead soda guns, and a queue of customers who notice before your staff do. Order too large a cylinder and you’re paying rental fees on a tank that sits half full for weeks, tying up floor space you don’t have. Getting the cylinder size right isn’t a small detail. For most restaurants, bars and breweries, it’s the difference between a smooth service and a scramble to find an emergency gas supplier at 9pm on a Saturday.
This guide breaks down the standard CO2 cylinder sizes used across the hospitality trade, how to work out which one actually fits your venue’s usage, and when it makes more sense to move away from cylinders altogether.
Why Cylinder Size Actually Matters for Your Bottom Line
Every gas cylinders supplier will tell you the same thing: undersizing and oversizing both cost money, just in different ways. A cylinder that’s too small means more frequent deliveries, more handling, and a higher risk of running dry mid-service. A cylinder that’s too large means paying rental on unused capacity and losing storage space you could use for stock.
The right size depends on your pour volume, the number of dispense points you’re running, and how often you’re comfortable with deliveries. Get this calculation right once, and it sets the tone for a much simpler gas supply relationship going forward.
The Standard CO2 Cylinder Sizes You’ll Come Across
Most gas suppliers in Europe work with a fairly standard range of cylinder sizes, though exact specifications can vary slightly between suppliers. Here’s what you’ll typically be choosing between:
| Cylinder Size | Typical Use | Best Suited For |
| 2 kg – 6 kg | Low-volume dispense, backup supply | Small cafés, low-traffic bars, backup cylinder for emergencies |
| 6 kg – 10 kg | Standard single-tap or dual-tap setup | Independent restaurants and neighbourhood bars |
| 20 kg – 34 kg | Multi-tap systems, moderate volume | Busy bars, mid-size restaurants, small breweries |
| 45 kg and above | High-volume, multiple dispense points | Large venues, restaurant groups, brewery taprooms |
Anything beyond this range usually means it’s time to look at a bulk CO2 supplier Europe arrangement rather than stacking multiple large cylinders, which we cover further down.
How to Work Out the Right Size for Your Venue
A rough but reliable method: track how many kegs or bottles you go through in a week, and match that against your supplier’s guidance on CO2 usage per litre poured. As a general rule of thumb, most venues use somewhere between 3% and 5% of the beverage volume dispensed in CO2 weight, though carbonation level, line length, and system pressure all shift that number.
● Count your active dispense points — every tap or gun draws down your supply.
● Note your delivery comfort zone — weekly, fortnightly, or monthly.
● Add a buffer cylinder for weekends, events, or seasonal spikes in footfall.
● Ask your supplier for a usage review after the first month — real numbers beat estimates.
A reliable industrial gas supplier will usually offer to run this calculation with you rather than leaving you to guess, especially if you’re setting up a new bar or switching from an existing gas supply arrangement.
Restaurants, Bars and Breweries Don’t Use CO2 the Same Way
Restaurants
Most restaurants use CO2 primarily for soft drink dispense and occasionally for kitchen applications like blast chilling or food preservation. Usage tends to be steady and predictable, which makes a mid-range cylinder (10–20 kg) with a scheduled delivery the simplest setup.
Bars
Bars typically run higher volumes with sharper peaks — Friday and Saturday nights can use several times the average weekday draw. This is where a multi-tap 20–34 kg cylinder, or a pair of cylinders on a changeover manifold, tends to work best so the bar never runs dry mid-service.
Breweries and Taprooms
Breweries generally have the highest and most consistent CO2 demand, both for carbonation during production and for dispense in the taproom. Once volumes climb past a certain point, cylinders become impractical to manage day to day, and bulk supply is almost always the more economical route.
Cylinders vs Bulk Supply: When Is It Time to Switch
Cylinders make sense for lower-volume venues because there’s no upfront tank installation and no long-term commitment. But once a venue is going through several large cylinders a week, the maths starts to favour bulk supply — a dedicated on-site tank refilled on a set schedule, with no cylinder changeovers, no empty-tank risk, and better per-unit pricing.
We’ve written a full comparison of the two options, including cost breakdowns and a simple checklist to work out which model suits your volume: Gas Cylinder Rental vs Bulk Supply: Which Is Right for Your Business?.
If you’re already leaning towards bulk, it’s worth talking directly to a supplier who handles both models so you’re not getting advice biased toward whichever product they happen to stock.
Storage and Safety: Getting the Cylinder Cage Right
Whatever size you land on, safe storage isn’t optional. CO2 cylinders need to be kept upright, secured, and away from direct heat sources, and most local fire and health and safety codes require a proper gas cylinder cage for any venue storing more than one or two cylinders — both for security and for ventilation in case of a leak.
● Keep cylinders in a well-ventilated area, ideally outdoors or in a dedicated store room.
● Secure every cylinder upright with a chain or strap — never left freestanding.
● Separate full and empty cylinders clearly so staff aren’t guessing during a busy shift.
● Fit CO2 detection where cylinders are stored in an enclosed space, particularly cellars.
A good gas cylinder supplier will usually advise on cage sizing and placement as part of onboarding, since getting this wrong is one of the more common compliance issues we see when reviewing a new client’s setup.
Beyond CO2: Nitrogen and Argon Cylinders Hospitality Venues Also Need
CO2 rarely travels alone in a hospitality setting. Many bars and breweries also run a nitrogen gas cylinder alongside their CO2 supply for nitro-poured beers and stouts, since nitrogen produces the tighter, creamier head that CO2 alone can’t replicate. Blended gas systems — mixing CO2 and nitrogen gas in set ratios — are increasingly common in craft beer venues for exactly this reason.
Restaurants running a wine preservation system will often use an argon gas cylinder instead, since argon is heavier than air and blankets an opened bottle to slow oxidation without altering flavour. It’s a smaller-volume need than CO2 or nitrogen, but one that’s easy to overlook when planning a gas supply setup from scratch.
If your venue needs more than CO2, it’s usually simpler to consolidate everything — CO2, nitrogen and argon — with one commercial gas supplier rather than managing separate accounts and delivery schedules for each gas.
A Quick Technical Note, For the Curious
If you’re comparing gas cylinders on a technical level rather than just a size chart, a couple of numbers come up often. The density of nitrogen gas at standard temperature and pressure is roughly 1.25 kg per cubic metre, noticeably lighter than CO2, which is part of why nitrogen produces a finer, longer-lasting bubble in dispense systems. Engineers sizing gas systems will sometimes also reference the nitrogen gas constant (about 296.8 J/kg·K) when calculating pressure and volume behaviour at different temperatures — not something a bar manager needs day to day, but useful context if your supplier’s technical team is talking you through a custom dispense setup.
Choosing the Right Gas Supplier Matters as Much as the Right Cylinder
Even the perfectly sized cylinder is only as useful as the supplier standing behind it. When you’re comparing natural gas suppliers and industrial gas suppliers for your venue, a few things separate the best gas supplier options from the rest:
● A gas distribution system that covers your region with realistic, guaranteed lead times.
● Certified, food-grade CO2 with full traceability and documentation on every delivery.
● Flexibility to combine cylinder and bulk supply as your venue grows.
● A single point of contact rather than a call centre, especially for urgent reorders.
At Infiinite Distribution, we work as a gas cylinders supplier and bulk CO2 supplier across Europe from our Budapest, Hungary headquarters, with the natural gas distribution network and ADR-compliant delivery in place to keep restaurants, bars and breweries stocked without the guesswork. Whether you need a single 20 kg cylinder for a new bar or a full gas supply in Europe programme across multiple sites, our team can build a plan around your actual usage rather than a one-size-fits-all package.
You can see the full range of what we supply for hospitality venues on our CO2 supplier for restaurants and breweries page, or explore our wider bulk CO2 supply across Europe options if your volumes are climbing.
FAQs
What size CO2 cylinder does a small bar need?
Most independent bars with one or two taps do well with a 6–10 kg cylinder on a weekly or fortnightly delivery, though this depends heavily on footfall and how many dispense points are running.
How long does a CO2 cylinder last in a restaurant?
A mid-size cylinder typically lasts two to four weeks in a steady-volume restaurant, but this varies with how much soft drink is dispensed and whether CO2 is also used for kitchen applications.
When should a venue switch from cylinders to bulk CO2 supply?
As a general guide, once a venue is going through the equivalent of several large cylinders a week, a bulk tank usually becomes more cost-effective and easier to manage than repeated cylinder changeovers.
Do I need a cylinder cage for CO2 storage?
In most jurisdictions, yes — any venue storing more than one or two cylinders needs a secured, ventilated cylinder cage to meet local safety and fire code requirements.
Can one supplier provide CO2, nitrogen and argon cylinders together?
Yes. Many commercial gas suppliers, including Infiinite Distribution, supply CO2, nitrogen and argon under a single account and delivery schedule, which simplifies ordering for venues that need more than one gas.
Ready to Get Your Cylinder Sizing Right?
Talk to our team about your venue’s volume and we’ll recommend the right cylinder size, or a bulk supply plan, based on your actual usage rather than guesswork. Get in touch with Infiinite Distribution to get started.
