The Short Version
Pick the cylinder size that matches how your kitchens actually work, not the one with the cheapest sticker price. The four cream-charger sizes on the UK wholesale market each have a sweet spot:
- 640g suits low-to-mid-volume operations where bench space is tight, changeover labour is cheap, and a single chef tends to own the dispenser. Think patisseries, dessert bars, single-site restaurants, hotel breakfast service.
- 666g is the workhorse mid-tier. Cream Deluxe (Black Cobra, Sixth Wave) and FastGas both sit here. It fits multi-site groups, busy hotel kitchens, and chains that want one SKU across estates without the storage burden of 2kg.
- 670g is FastGas territory — a near-twin of 666g with marginally more gas per cylinder. Operational profile is almost identical to 666g; pick on price-per-gram and supplier preference.
- 2kg is for high-throughput kitchens that burn through small cylinders before lunch service ends. Cream Deluxe and FastGas both ship 2kg variants. Fewer changeovers, more storage commitment, better cost-per-gram at volume.
There is no universal winner. Operations stocking the wrong size pay for it twice: once in wasted labour at changeover, once in the floor space the cylinders eat that could have held something earning revenue.
Who This Guide Is For
This is for procurement leads, head chefs with buying authority, F&B directors, and distributors who need to make a defensible call on cylinder size before issuing a quote request. If you’re choosing between 640g and 666g for the first time, or weighing whether your six-site group should jump to 2kg, this is the framework.
It assumes you’ve already settled the food-grade question. If you haven’t, start with the food-grade N2O supplier guide and come back. Cylinder size is a workflow decision; food-grade certification is a non-negotiable.
It also assumes you’ve narrowed to one or two brand families. Smartwhip, Cream Deluxe, and FastGas each behave differently at scale. The brand procurement framework covers that decision. This guide picks up where that one ends.
The Four Questions Behind The Size Decision
Every size decision worth defending answers four questions in order. Skip one and you’ll end up with a stockroom full of the wrong cylinders and a head chef who’s quietly furious.
1. Daily usage volume
How much nitrous oxide does your operation actually consume per kitchen per day? Not per week, not “around a case” — grams per kitchen per day. If you don’t know, work backwards from the last quarter’s invoices. Total grams purchased, divided by operating days, divided by active kitchens.
| Daily volume per kitchen | Likely fit |
|---|---|
| Under 500g/day | 640g |
| 500g–1.5kg/day | 666g or 670g |
| 1.5kg–4kg/day | 666g/670g with frequent changeovers, or step to 2kg |
| Over 4kg/day | 2kg |
These ranges overlap on purpose. Two kitchens consuming 1kg/day can land on different sizes depending on the next three questions.
2. Kitchen workflow and changeover tolerance
A cylinder changeover takes a chef out of service for somewhere between thirty seconds and three minutes depending on dispenser, kitchen layout, and how flustered the pastry section is. Multiply that by the number of changeovers per service, then by the number of services per week, then by an hourly labour rate.
The number gets uncomfortable fast. A six-site group running ten changeovers per kitchen per week at three minutes each is burning the equivalent of a part-time pastry commis on tank swaps alone. Yes, your kitchen team will notice when changeovers drop from twice a service to twice a week.
3. Storage footprint and safety zone
Larger cylinders take more floor space per cylinder, but fewer cylinders per kilogram of gas held. The maths is not as obvious as it looks.
A reasonable rule: 2kg cylinders cut your cylinder count by roughly two-thirds versus 666g for the same total gas held, but each one demands a wider safe-handling footprint. If your stockroom is a converted broom cupboard, this matters. If you’re working from a proper dry goods store with ventilation, less so.
4. Pallet logistics and container fit
This is where importers, distributors, and any buyer ordering by the pallet need to pay attention. Units-per-pallet varies by cylinder size, manufacturer, and packaging spec. We don’t publish fixed pallet counts because they shift with supplier batch and crate dimensions. You’ll get the working figure on your quote.
For container-load buyers, the practical question is: how many kilograms of gas can you fit in a 20ft or 40ft container at each cylinder size? Bigger cylinders generally deliver more gas per cubic metre of container space, but the margin is narrower than you’d expect once you account for void packaging. Pallet counts and container fit are confirmed at quote.
640g Profile — Where It Fits
640g is the size you reach for when the kitchen owns the workflow, not the procurement team. It’s compact, the dispenser fits comfortably on a single chef’s section, and the cylinder swap is a thirty-second job that doesn’t break flow.
Operational profile:
– Daily usage per kitchen: under 500g
– Sites: typically 1–6
– Service style: à la carte, pastry, dessert, breakfast hotel service, cocktail bar
– Storage: bench-adjacent or under-counter
– Changeover frequency: every 2–5 services
Smartwhip dominates this size on the UK wholesale side. The Smartwhip Original 640g is the default for buyers who want the recognised brand at the recognised size. The Smartwhip Silver 640g offers the same form factor at a different price point — useful when you’re stocking multiple sites and want to test cost-sensitivity without changing dispenser SOPs.
Who 640g doesn’t fit: any operation where a chef is changing cylinders more than once per service. At that point the labour cost overtakes the cylinder cost savings. You’ve outgrown the size.
666g Profile — Where It Fits
666g is the mid-market workhorse. It’s the size most multi-site groups land on after their first procurement review, because it splits the difference between 640g’s nimbleness and 2kg’s storage demands.
Operational profile:
– Daily usage per kitchen: 500g–1.5kg
– Sites: 3–20
– Service style: full-service restaurants, busy hotel F&B, café chains with strong dessert programmes, patisserie groups
– Storage: dedicated stockroom shelf or floor zone
– Changeover frequency: every 1–3 services
This is Cream Deluxe’s home turf. Both Cream Deluxe Black Cobra 666g and Cream Deluxe Sixth Wave 666g ship at 666g and have become the default for buyers who want a recognised cream-charger brand that isn’t paying the Smartwhip premium. The two variants differ on packaging finish more than gas spec — pick whichever your warehouse team finds easier to count.
Who 666g doesn’t fit: single-kitchen operations doing under 300g/day (the cylinders will sit too long between uses), and 20-site-plus chains where 2kg becomes the more honest answer.
670g Profile — Where It Fits
670g is FastGas territory and operationally near-identical to 666g. The 4g gas differential is too small to drive a workflow decision on its own. The reason buyers choose 670g over 666g is usually one of three:
- They’re already buying FastGas products in other sizes and want SKU consistency.
- The per-gram pricing on a specific quote favours 670g.
- They prefer FastGas’s distribution model or lead times.
Operational profile: identical to 666g — 500g–1.5kg per kitchen daily, 3–20 sites, mid-volume kitchen workflows.
The FastGas 670g is the SKU. Treat the 666g vs 670g decision as a brand and price decision, not a workflow decision. If you’ve decided you’re a mid-tier-cylinder buyer, the 4g doesn’t change your operation.
2kg Profile — Where It Fits
2kg is the high-throughput option. It’s also the size buyers most often think they’re ready for before they actually are. Stepping up to 2kg without honest usage data is how you end up with cylinders going stale on the rack and a head chef wrestling a tank that doesn’t fit her workflow.
Operational profile:
– Daily usage per kitchen: 1.5kg+, ideally 3kg+
– Sites: typically 6+, often 10–50
– Service style: high-volume café chains, multi-site coffee groups, large-scale catering, central commissary kitchens, distributor sub-stock
– Storage: dedicated cylinder zone, proper ventilation
– Changeover frequency: once every 1–3 days per kitchen at the low end, multiple times per day at the high end
Cream Deluxe 2000g and FastGas Original 2000g are the two main wholesale options. Pick on brand alignment with the rest of your estate and on the per-gram quote.
The case for 2kg gets stronger the larger your estate. Twelve sites changing cylinders twice a service on 666g is a different operational reality from twelve sites changing cylinders twice a week on 2kg. The cost-per-gram savings are real but secondary; the labour and workflow savings are usually the bigger number.
Who 2kg doesn’t fit: single-site operations, anyone without proper cylinder storage, and any buyer whose actual usage data doesn’t justify it. “We might grow into it” is not usage data.
Size Comparison Matrix
| 640g | 666g | 670g | 2kg | |
|---|---|---|---|---|
| Daily usage per kitchen | Under 500g | 500g–1.5kg | 500g–1.5kg | 1.5kg+ |
| Typical site count | 1–6 | 3–20 | 3–20 | 6+ |
| Changeover frequency | Every 2–5 services | Every 1–3 services | Every 1–3 services | Every 1–3 days at low end |
| Storage footprint per cylinder | Smallest | Mid | Mid | Largest |
| Pallet quantity | Confirmed at quote | Confirmed at quote | Confirmed at quote | Confirmed at quote |
| Container fit (gas per m³) | Lower | Mid | Mid | Higher — varies by supplier batch, confirmed at quote |
| Brand depth at this size | Smartwhip | Cream Deluxe, FastGas | FastGas | Cream Deluxe, FastGas |
| Best-fit buyer | Patisseries, single-site restaurants, hotel breakfast, dessert bars | Multi-site restaurant groups, mid-volume café chains, hotel groups | Same as 666g — brand/price preference | High-volume chains, central commissaries, distributors |
No row crowns a single winner. Every size has a real sweet spot and a real failure mode.
Named Buyer Scenarios
Three real-world-shaped buyers, three different right answers.
Pasha — six-site Manchester patisserie
Pasha runs six patisserie sites across Manchester and the surrounding boroughs. Each kitchen does roughly 350–450g of nitrous oxide per service day, mostly for chantilly, mousses, and a signature whipped ganache that runs all year.
Pasha’s procurement lead initially priced 2kg cylinders because the per-gram cost looked unbeatable. Then she sat in a Saturday service at the Didsbury site and watched the lead pastry chef wrestle a 2kg cylinder into a dispenser designed around something smaller. The cylinder spent more time on the floor than in the rig.
She landed on Smartwhip Original 640g. Six sites, six neat dispensers, predictable changeover rhythm, and the brand alignment matters for the front-of-house story her marketing team tells. The unit cost is higher than 2kg per gram. The total cost per kitchen-hour is lower.
Theo — four-property Cotswolds hotel group
Theo’s group runs four boutique country hotels. Each property has a 70-cover restaurant plus afternoon tea service, weddings on weekends, and a small banqueting capacity. Daily nitrous oxide volume per kitchen sits between 800g and 1.4kg depending on weddings.
Theo standardised on Cream Deluxe Black Cobra 666g across all four properties. The reasoning: usage is firmly in the mid-band, the four head chefs each prefer one dispenser SOP across the group, and 666g lets the storage rooms (mostly converted estate outbuildings, no two identical) hold a reasonable buffer without dedicating a whole shelf to a single brand.
He looked at 2kg. He decided the seasonal volume swings — quiet Februarys, frantic Junes — meant 2kg cylinders would sit unsold in cold months. 666g moves through stock cleanly across the calendar.
Marcus — twelve-site coffee chain, head of beverage
Marcus runs beverage for a twelve-site specialty coffee chain across the South East. Cold foams, nitro-infused milks, and a seasonal whipped-topping menu mean each site consumes 2.5kg–4kg of nitrous oxide daily, with the flagship Brighton site occasionally cresting 5kg on weekends.
Marcus moved to FastGas Original 2000g eighteen months in. He’d started on 666g because that’s what the previous beverage lead had specified, but changeover frequency at the busy sites was crushing barista flow. Three changeovers per peak hour at the Brighton flagship. The new SOP — one cylinder lasts most of a peak service — has cut his perceived stock turnover anxiety dramatically and given baristas more dwell time on actual customer service.
The 2kg footprint demanded a stockroom retrofit at four of the twelve sites. He still considers that the easiest cost he’s signed off all year.
Common Sizing Mistakes
Five mistakes that turn up in nearly every sizing conversation.
Mistake 1: Sizing on label price instead of total cost per kitchen-hour. The cheapest cylinder per cylinder is rarely the cheapest cylinder in your operation. Labour, changeover frequency, storage opportunity cost, and stale stock all hide in the gap.
Mistake 2: Ignoring changeover labour. A chef on £14/hour doing a three-minute changeover six times a service is a real number, repeating five days a week. Most buyers undercount this by half.
Mistake 3: Sizing for “future growth” you haven’t proven yet. If you’re doing 800g/day per kitchen and considering 2kg because you plan to triple volume next year, wait until volume actually triples. Stale 2kg cylinders are an expensive way to express optimism.
Mistake 4: Standardising across the estate when sites have genuinely different profiles. A group with one high-volume flagship and three smaller satellites might legitimately run two cylinder sizes. The cost of SKU duplication is usually lower than the cost of forcing the wrong size into the wrong kitchen.
Mistake 5: Buying the brand first and the size second. Brand and size are linked decisions, but they’re separate ones. If you’ve decided you want Smartwhip but Smartwhip’s UK depth is concentrated at 640g and your operation needs 2kg, you’ve designed yourself into a corner. Decide volume, then size, then brand.
How BCC Helps You Size The Order
Two things to know about the quote flow:
First, every quote we issue includes pallet quantities for the specific size and brand you’ve selected. We don’t publish those numbers in the catalogue because they move with supplier batch and packaging spec. The figure on your quote is the figure your warehouse will see.
Second, for container-load buyers, we’ll model two or three size scenarios side by side if you’re undecided. If you tell us your daily volume per kitchen, your site count, and your dispenser SOPs, we can show you what 666g vs 2kg looks like at the same total gas held. The maths usually settles the conversation faster than another internal meeting will.
Quote requests run through the wholesale qualification page. The questions are short. The faster they’re answered honestly, the faster the quote lands.
FAQ
Is 670g actually different from 666g in any operationally meaningful way?
In daily use, no. The 4g gas differential is too small to drive workflow, storage, or changeover decisions. Treat 666g vs 670g as a brand and quote-price decision, not a sizing decision.
Can we mix sizes across our estate?
Yes, and for some groups it’s the right answer. A flagship site running 2kg while satellite locations run 666g is operationally fine, provided dispenser SOPs are documented and warehouse picking is clear. The cost of SKU duplication is usually lower than the cost of forcing one size onto kitchens with very different volumes.
Do larger cylinders always work out cheaper per gram?
Generally yes, but the headline per-gram saving evaporates if the cylinders don’t move. A 2kg cylinder that sits idle for three weeks because your kitchen doesn’t burn through it is more expensive in practice than a 640g cylinder used in two services. Per-gram cost only matters when paired with turnover velocity.
How many cylinders fit on a pallet?
It varies by size, manufacturer, and supplier batch. We don’t publish a fixed figure because it would be wrong half the time. Pallet quantities are confirmed at quote, and we’ll give you the working figure for the specific SKU and batch you’re ordering.
We’re a distributor — should we stock all four sizes?
Depends on your customer base. Distributors serving mixed-volume hospitality usually carry at least three sizes (640g, 666g or 670g, and 2kg). Specialist distributors serving one segment — say, premium hotel groups — often run two sizes deep. Stocking all four is rarely wrong, but it does mean four SKUs of inventory commitment.
Does cylinder size affect food-grade certification?
No. Food-grade certification is a property of the gas and the fill process, not the cylinder size. Every size in this guide is available in food-grade specification from the brands listed. Verify on your quote and on the supplier documentation, not on the cylinder label.
How quickly can we change cylinder size if our volume shifts?
Cleanly, but not instantly. Most buyers run down existing stock before swapping size to avoid wasting cylinders that don’t fit the new SOP. Plan a 4–8 week transition for a single-size switch across a multi-site estate. Dispenser compatibility check first, SOP rewrite second, stock changeover third.
Next Step
If you’ve read this far, you probably know which size you’re moving toward. The next step is a quote — but a quote is faster and more useful with two pieces of homework done first.
One: confirm food-grade specification on the brand and size you’re choosing. The food-grade N2O supplier guide walks through what to ask for.
Two: settle the brand decision if it’s not already settled. The brand procurement framework covers Smartwhip, Cream Deluxe, and FastGas side by side.
Then send the qualification form. Tell us your daily volume per kitchen, your site count, and the size you’ve landed on. If you’re undecided between two sizes, say so — we’ll quote both and let the numbers settle it.