Jetboil
Jetboil Flash 1.8L Fast Boil System (carbon)
- Weight: 4/10 How much it adds to your pack.
- Fuel use: 9/10 How much fuel it burns to boil a litre in calm air: less fuel to carry.
- Boil speed (calm air): 7/10 How fast the maker says it boils 1 litre in calm air.
Pairs or groups of three or four who mostly boil water for drinks and freeze-dried meals
- Fuel
- Gas
- Weight
- 504 g
- Pot size
- 1.8 L
- Boil 1 L, calm air
- 4:00
- Fuel per litre
- 10 g
Packed size 20.9 cm long and 12.4 cm across Compare with a 2-litre bottle
Shorter than a 2-litre bottle and a bit wider than one. Drawn to scale.
Where to buy
Trekitt £155.79 In stock. Free delivery. Free next-day delivery over £65. Shop shows a struck-through list price of £189.99 (18% off); Jetboil UK doesn't list this model (Live for the Outdoors gives an RRP of £190).
View at shop: TrekittMilitary Kit £159.95 In stock. Free delivery. Free UK delivery on all orders.
View at shop: Military KitPrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Weight
From maker's figures 4/10How much it adds to your pack. 4: A bit below average.
504 g is Jetboil's published system weight (Jetboil US page, repeated by Military Kit and The Big Outside). Jetboil says the figure leaves out the 27 g fuel stabiliser, as it does for the Flash 1.0L and Zip. Live for the Outdoors weighed 514 g without the canister or stabiliser and SectionHiker lists 533 g. All sit in the 450-649 g band.
Fuel use
From maker's figures 9/10How much fuel it burns to boil a litre in calm air: less fuel to carry. 9: Among the best you can buy for this.
Jetboil says 10 litres per 100 g canister (Jetboil US page), which is 10 g per litre, under the 11 g line. Live for the Outdoors repeats Jetboil's claim of about 24 one-litre boils from a 230 g canister (9.6 g per litre).
Boil speed (calm air)
From maker's figures 7/10How fast the maker says it boils 1 litre in calm air. 7: Better than most.
Jetboil says 120 s per 0.5 litre (average over the life of a can), scaled to 240 s for 1 litre (scaled), in the 210-269 s band. Military Kit, Live for the Outdoors and SectionHiker (2 min 0 s per 0.5 litre, 4 min 0 s per litre) all give the same claim. Trekitt's table prints 4 min 30 s per litre (270 s, band 3), which doesn't match Jetboil's own page, so it isn't used. Live for the Outdoors timed 2 min 14 s for 0.5 litre in a light breeze of about 8 km/h at 12 °C; SectionHiker timed about 4 min for 1 litre at about 10 °C.
In short
Good for
- Pairs or groups of three or four who mostly boil water for drinks and freeze-dried meals
- Three-season trips where one 1.8 L pot saves boiling in rounds (maximum recommended fill 1.25 L)
- Campsite or car-to-trail cooking where weight matters less than speed and fuel use
Strengths
- Jetboil quotes 120 s for 0.5 litre; Live for the Outdoors timed 2 min 14 s in a light breeze and SectionHiker about 4 min for 1 litre
- About 10 g of fuel per litre boiled, so one canister goes a long way on a group trip
- Redesigned burner: twist ignition, three-point pot lock and silicone folding handles (Live for the Outdoors, SectionHiker)
- Burner, stabiliser and a 100 g canister pack inside the pot (packed 12.4 x 20.9 cm)
Weaknesses
- 504 g before fuel and stabiliser, heavy for one or two people; Live for the Outdoors weighed 514 g
- Maximum recommended fill is 1.25 L, not the full 1.8 L
- No regulator, so output falls in the cold and as the canister empties; not for winter
- Not impervious to wind: boil times crept up in a breeze (Live for the Outdoors) and Jetboil sells a windscreen separately
- Little simmer control, and the volume marks inside the pot are hard to read
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.