Jetboil Flash Cooking System review
By Tom Calder
A fast, fuel-efficient all-in-one that boils 500ml in about two minutes and packs into its own 1L cup, making it a tidy back-up for hot food and drinks in a power cut. Like any gas stove it burns fuel and produces carbon monoxide, so it is strictly for outdoor or well-ventilated use only.
- Best for
- Boiling water fast for hot drinks and freeze-dried meals when the power's off or you're outdoors.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Boils 500ml in roughly two minutes and stays efficient in wind thanks to the FluxRing heat exchanger
- Very frugal with fuel — one 100g canister boils around 10 litres, so a couple of spare canisters go a long way
- Compact and self-contained: burner, stabiliser and canister nest inside the 1L cup
Worth knowing
- Built for boiling, not cooking — it's poor at simmering, so don't expect to make proper meals in it
- Standard isobutane canisters lose performance in near-freezing temperatures
ⓘ As an Amazon Associate, PreparedBritain earns from qualifying purchases. We may earn a commission when you buy, or a fee when you request a quote, through our links. When two products are close, commission can decide which one we pick. A clearly better product always wins. Amazon prices come from Amazon's own product data and show the date and time they were retrieved. Prices at other retailers are checked by us, less often. Prices and stock can change at any time, so always check the retailer's price before you buy.
Our review
The Jetboil Flash is a one-litre cup with a burner and heat exchanger built in, made to boil water fast and use little gas. For a household it is the quick way to make hot drinks and rehydrate meals outdoors during a power cut. It only boils, and like every gas stove it is for outdoor use only.
What it is
Jetboil lists the current Flash at 371g for the system, with a 27g fuel stabiliser that adds to that, a one-litre tall cup with an insulating cosy, a lid, and the burner, all of which nest inside the cup with a 100g gas canister. The canister is not included. The FluxRing heat exchanger on the cup's base is what makes it efficient: Jetboil claims about 10 litres boiled per 100g JetPower canister. Output is 1.5kW, or 5300 BTU an hour, and the igniter is a turn-and-click rotary type. Jetboil sells canisters in 100g, 230g and 450g sizes, and any threaded, self-sealing canister fits.
Boil time
Jetboil's figure for the current model is 120 seconds for half a litre, averaged over the life of a canister. Some UK retailers still quote 100 seconds, which was the rating of earlier Flash versions, so take two minutes as the honest number. Either way it is quicker than an open burner, and the enclosed design keeps the flame working in a breeze that would slow a bare stove. In cold weather a standard canister loses pressure, so keep the canister in a pocket before use.
Safety: outdoors only
The Flash burns gas and gives off carbon monoxide. The NHS lists camping stoves used indoors as a cause of carbon monoxide poisoning and says not to use one indoors or inside a tent. In a power cut, that means boiling the kettle outside on a stable surface, away from doors and windows, never in a garage, porch or conservatory, with a working CO alarm in the house. Our carbon monoxide symptoms guide explains the signs, and our cooking without power guide covers the safe options.
How it compares
On our camping stove comparison the MSR PocketRocket 2 is a bare burner that weighs a fifth as much and takes your own pans, but boils slower and suffers more in wind. The PocketRocket Deluxe adds a regulator and igniter. The Kelly Kettle Scout boils on twigs with no gas to buy. For frying or a family pan, a double-burner Campingaz is steadier. The Flash is the pick when boiling water quickly and frugally is the whole job.
Our verdict
Buy it if your power-cut cooking plan is hot drinks, instant meals and freeze-dried pouches, and you want the fastest, most fuel-efficient way to boil for them outdoors. Skip it if you want to cook real meals, since it simmers poorly and the cup is its only pot, or if you have nowhere safe outdoors to use it. Keep two spare canisters with it; a 100g can is good for about 20 half-litre boils by Jetboil's figures.
A researched review, built from the maker's specs, manual and UK listings; facts checked 2 Nov 2026. Sources: Jetboil (Johnson Outdoors): Flash 1.0L fast boil system; Mountain Warehouse: Jetboil Flash 1.0L specification; NHS: carbon monoxide poisoning.
Who shouldn't buy this
Don't buy it expecting a stove you can safely run indoors during a power cut — like all fuel-burning stoves it must only be used outdoors or in a well-ventilated space because of carbon monoxide risk. Also skip it if you want to actually cook rather than just boil water, or if a basic £20–30 camping stove would do the job for less.
Key specs
| Type | Integrated 1L canister stove system |
| Fuel | Screw-on gas canister (isobutane/propane, e.g. Jetpower 100g) |
| Boil time | 2 min |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for A featherweight, dependable burner with instant piezo ignition for boiling water and simple cooking in a grab bag or camping kit.
as of 2 Nov 2026, 16:07 GMT · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.
Best for A family or small group wanting one outdoor kit that boils a larger kettle and cooks a hot meal on sticks, with no gas or batteries to buy.
in stock when checked
Best for A household or small group that wants one wood-fired set to boil water, cook and serve from, with no gas, batteries or fuel to buy.
in stock when checkedQuestions
Can I use a Jetboil Flash indoors in a power cut?
No. It gives off carbon monoxide, and the NHS says not to use a camping stove indoors or inside a tent. Use it outside, away from doors and windows, and keep a CO alarm in the home.
How fast does the Jetboil Flash boil water?
Jetboil rates the current model at 120 seconds for half a litre, averaged over the life of a canister. Older versions were rated at 100 seconds, which some retailers still quote.
How much gas does the Jetboil Flash use?
Jetboil claims about 10 litres boiled from a 100g JetPower canister, so roughly 20 half-litre boils. The canister is not included.
Can you cook meals in a Jetboil Flash?
It is designed for boiling water rather than cooking. The flame is hard to hold at a simmer and the cup is tall and narrow, so rehydrate pouch meals and make drinks in it, and use a pan stove for real cooking.
Free alerts for your home
Home Alerts emails you when a power cut, a Met Office warning or a flood warning covers your postcode. Free for your own home. Sign up in a minute.
Start free →