Hydrogen and helium are the two lightest gases there are, and both will lift a balloon. So why does almost every party, event and venue in the UK fill balloons with helium rather than the cheaper, even-lighter hydrogen? The short answer is safety: helium is non-flammable, hydrogen is not. Below we compare the two on lift, cost, availability and safety, then point you to the right helium canister for the job.
As a UK bottled-gas supplier and a stockist of helium for party balloons, we sell the safe option every day — here is the honest comparison behind that choice.
Hydrogen vs helium for balloons — at a glance
| Factor | Hydrogen | Helium |
|---|---|---|
| Lifting power | Highest of any gas (slightly more lift than helium) | Very high — about 93% of hydrogen’s lift |
| Flammable? | Yes — highly flammable and can ignite near heat or a flame | No — completely non-flammable |
| Cost of the raw gas | Cheaper; can be produced in many ways | More expensive; a finite, mined resource |
| Practical cost for balloons | Specialist handling offsets the saving | Sold ready to use in safe disposable canisters |
| Availability for parties | Not sold for general balloon use | Widely available in canisters and refillable cylinders |
| Recommended for balloons? | No — the fire risk rules it out for decorative use | Yes — the industry standard worldwide |
The table makes the trade-off plain: hydrogen wins on paper for lift and raw cost, but loses decisively on the one factor that matters at a party — it can catch fire. That single difference is why helium is the standard.
Why helium is the safer choice
Helium is inert and non-combustible — it will not burn or explode, even right next to a candle, a cigarette or a hot light. Hydrogen-filled balloons, by contrast, carry a genuine ignition risk in exactly the settings balloons are used: birthdays with cake candles, marquees, venues with spotlights. For decorative and celebratory use, that risk is not worth the few pence saved per balloon.
Helium is not risk-free, and we would rather you knew the one real hazard: never inhale it. Helium displaces oxygen, so breathing it in — the “squeaky voice” trick — can cause dizziness, and in extreme cases asphyxiation. Used to fill balloons, with the canister kept upright and away from children, it is a safe, everyday product. As a bottled-gas supplier we take that guidance seriously.
Is hydrogen really cheaper than helium?
The gas itself is, yes — hydrogen is abundant and can be made from natural gas or by splitting water, while helium is a finite resource recovered from the ground. But “cheaper gas” does not make hydrogen the cheaper balloon solution. Hydrogen for inflation needs specialist handling and is not sold for general party use, so the headline saving disappears in practice. Helium is sold ready to use in single-use canisters and refillable cylinders, with no fire-safety burden on you — which is why it is both the safer and the more practical choice for events.
Choosing the right helium for your balloons
For helium, the only real decision is how many balloons you need to fill:
- Small parties (around 10–30 balloons): a disposable helium canister is simplest — no rental, no deposit, recycle when empty. Our small disposable helium canister fills around 10 balloons, with larger disposables in the helium for party balloons range.
- Regular events, venues and businesses: a refillable helium cylinder works out cheaper per balloon and means you are never caught short — ideal for party planners, florists, venues and event managers.
Not sure which size fits your event? Our full helium canisters range and the helium overview lay out the options, or find an Adams Gas stockist near you to collect locally.
The verdict
Hydrogen is lighter and the gas is cheaper — but it is flammable, and that rules it out for balloons. Helium gives you almost identical lift with none of the fire risk, sold in safe, ready-to-use canisters. For any party, event or display, helium is the right call — and Adams Gas supplies it across the UK with no cylinder rental on disposables and trade refills for regular users.
Looking for helium for your event? Browse our helium for party balloons range, or try our popular small helium canister for 10 balloons — no rental. Find a stockist near you.
Frequently asked questions
Is hydrogen or helium better for balloons?
Helium. Both gases float a balloon, but hydrogen is highly flammable while helium is completely non-flammable, making helium the safe, standard choice for parties and events.
Is hydrogen cheaper than helium?
The raw gas is cheaper, as hydrogen is abundant and easy to produce while helium is finite. But hydrogen is not sold for general balloon use because of its fire risk, so helium is the cheaper practical option for filling balloons safely.
Why is helium used in balloons instead of hydrogen?
Because helium is non-combustible. It gives nearly the same lift as hydrogen with no risk of ignition near candles, lights or heat, making it far safer for party use.
Are hydrogen balloons dangerous?
They can be. Hydrogen can ignite near a flame or heat source, so hydrogen-filled balloons carry a real fire risk in party settings. This is why helium is the worldwide standard for balloons.
How many balloons does a helium canister fill?
It depends on the canister and balloon size. A small disposable canister fills around 10 balloons, with larger disposables and refillable cylinders filling far more.
