Running out of gas halfway through a bottle is the one failure a home carbonation machine has. The usual fix is framed as CO2 cylinder exchange vs buying a spare cylinder, as though one were a service and the other a purchase. Read the seller’s own wording and the regulator’s, and both turn out to be the same thing with a different number of cylinders in the house.
This is an independent editorial comparison. SodaStream did not review or approve this article.
This article reads SodaStream’s Canadian storefront and support pages and the Canadian transport rules that apply to cylinders here, so the terms, the exchange process and the regulator named below are the Canadian ones; a carbonating cylinder is a pressurized container, and the handling and storage instructions that come with the machine are the ones to follow rather than anything general said here.
You can see SodaStream’s current Canadian lineup on its official site:
Reading CO2 cylinder exchange vs buying a spare cylinder in one table
The rows that matter are about who holds the cylinder and who is allowed to fill it, not about convenience.
| What you are comparing | Exchange | Spare cylinder |
|---|---|---|
| What you are paying for | The gas, on the seller’s wording | A license to use a cylinder, plus the gas |
| Cylinders in the house afterward | The same number | One more than before |
| Who owns the cylinder | Neither case transfers ownership | Neither case transfers ownership |
| What happens when it empties | Swap at a retail location or by courier | Fit the spare, then swap the empty |
| Gap in service | However long the swap takes | None, if the spare is full |
| Obligation created | Return the empty within the stated window | The same obligation, deferred |
| Who refills | A registered facility, never you | A registered facility, never you |
The seller says you are licensing the cylinder, not buying it
SodaStream’s Canadian support pages are explicit on the first row of that table. On the exchange, the company describes returning a cylinder “in exchange for a full cylinder, for the price of a CO2 refill only,” and states that “The license will continue to bind the use of each subsequent SodaStream cylinder.”
On the spare, the same page says: “For every spare cylinder purchased, you pay a licensing fee to use the cylinder and for CO2.” It also recommends keeping at least three cylinders on hand, so that two can be exchanged at a time.
That reframes the comparison completely. A spare is not a one-time purchase that ends the running cost. It is the license fee for an additional cylinder, bundled with a fill. The exchange is the fill on its own. Both routes leave the cylinder itself inside the same arrangement, which is why you can hand an empty back rather than having to dispose of it.
Why neither route lets you refill at home
The reason both options exist, and the reason neither is a refill, sits in Canadian transport rules rather than in anything the seller decided. Transport Canada’s own requirements page describes the regime for cylinders: “TC specification cylinders and tubes must be designed, manufactured, initially tested, initially inspected and marked” in line with the CSA B339 standard, and a compliant cylinder “will have permanent marks that follows the requirements set out in clause 4.19 of CSA B339.”
Two further sentences on that page decide the whole question for a household:
- “The frequency of requalification depends on the cylinder/sphere/tube specification” and the gas carried, with the intervals set in the standard rather than by the owner.
- “Only cylinders, spheres and tubes that are within their requalification period and service life can be filled.”
And the work is reserved to registered parties. A facility in Canada “must requalify and mark the cylinder, sphere or tube in accordance with CSA B339,” and before doing so it has to be registered with Transport Canada. The page adds that only manufacturers registered with Transport Canada may display the TC specification mark, and that a certificate of registration “is valid for five years, after which the facility must apply for renewal.”
So a carbonating cylinder is a dated, marked pressure vessel with an expiry on its permission to be filled. The exchange network exists because the cylinder has to go back to somebody licensed to inspect it, not because the seller prefers a subscription.
CO2 cylinder exchange vs buying a spare cylinder pros and cons, once ownership is off the table
A fair CO2 cylinder exchange vs buying a spare cylinder pros and cons list looks different once you accept that you are licensing cylinders either way:
- A spare removes the only real inconvenience, which is the gap between running out and swapping.
- A spare costs cupboard space and adds a cylinder you will eventually have to hand back.
- An exchange keeps the household at one cylinder and the running cost at gas only.
- An exchange makes the timing of your next trip the thing that decides if you have bubbles.
- Holding several cylinders lets you batch the swaps, which is the seller’s own stated reason for recommending it.
The empty is a deadline, not a leftover
The courier route makes the obligation visible. SodaStream describes the online version as an arrangement where “We offer an exchange in which you get a new carbonating cylinder in exchange for your empty one,” with a prepaid courier label to send the empties back in the box the full ones came in.
The condition attached is the part worth reading twice: “SodaStream must receive your used cylinder(s) no later than 90 days after placement of your exchange order,” and a charge applies for each cylinder that is not returned. There is also a small fee for returning an empty without taking a replacement.
In practice that means a spare cylinder is a cylinder you have agreed to send back later. It is a genuinely useful thing to own, and it is not a way out of the loop.
What is CO2 cylinder exchange better than buying a spare cylinder really asks
Put as a flat question, is CO2 cylinder exchange better than buying a spare cylinder has no single answer, because the two solve different problems. Worked as a sequence, it resolves quickly:
- Estimate how often the machine is actually used, in bottles per week rather than per day.
- Check how far the nearest participating retail location is, since the in-store route is the fast one.
- Decide whether running dry for a day or two is an irritation or a real problem in your household.
- Find somewhere to keep a second cylinder upright, away from heat, if you are going to hold one.
- Note the return date, because the obligation on an exchange order runs on a stated window.
Heavy, impatient households benefit from a spare. Light users carrying a single cylinder to a nearby store lose nothing by exchanging as they go.
What a CO2 cylinder exchange vs buying a spare cylinder 2026 comparison leaves out
A CO2 cylinder exchange vs buying a spare cylinder 2026 comparison tends to focus on where the swap is cheapest this month. Three stable facts matter more and rarely appear:
- The cylinder carries permanent marks set by a standard, and those marks, not the label, govern whether it can be filled again.
- The retail route involves the store sending empties back, which SodaStream describes as cylinders returned “to be cleaned, inspected, and refilled” with beverage-grade gas.
- Both routes keep the cylinder inside the same license, so neither ends the relationship.
You can see SodaStream’s current Canadian lineup on its official site:
Frequently Asked Questions
Four questions follow naturally from treating the cylinder as a regulated container.
Can I get a cylinder refilled at a welding or beverage gas supplier?
Only a facility registered for the purpose may requalify and fill a cylinder to the standard, and only within its requalification period and service life. Whether a given supplier is registered and willing to handle a particular cylinder is a question for that supplier, and the cylinder also sits under the seller’s license terms.
Do cylinders expire?
The permission to fill one does. Transport Canada’s page ties filling to the requalification period and the service life, both of which are set by the standard for that cylinder specification rather than chosen by the owner.
How many cylinders should a household keep?
SodaStream’s own recommendation on its Canadian support pages is at least three, so that two empties can be exchanged in one trip. That is a logistics recommendation rather than a capacity one.
What happens if I never return the empty?
The online exchange sets a window of 90 days from the order for the used cylinder to arrive, and an additional charge applies for each cylinder not returned. Returning an empty without an exchange carries a small fee instead.
Bottom line
Neither route sells you a cylinder, so the real decision is how many licensed cylinders you want sitting in the kitchen and how much you mind a gap in service. The regulator decides the rest, which is why the gas comes to you and the cylinder always goes back.
