Trangia Spirit Burner Review

Overview

The Trangia Spirit Burner (model B25) is the brass fuel cup that has sat at the heart of Trangia’s storm cookers for decades. It’s sold on its own with a simmer ring and an O-ring-sealed screw cap, which makes it a natural fit for hikers building a custom alcohol-stove rig or replacing a worn burner in an older Trangia kit. The trade-off is that it is a heat source, not a finished stove: the pot stand and windscreen are up to the buyer.

Key Specs

Spec	Detail
Model	B25
Weight	110 g (3.9 oz)
Fuel type	Alcohol-based fuels
Output	~1,000 W
Boil time	~10 min per liter
Burn time	~25 min per fill
Fuel capacity	70 ml
Dimensions	Ø75 x 42 mm
Material	Brass body, 100% cotton wick
Includes	Burner, simmer ring, screw cap with O-ring
Compatibility	All Trangia stove systems

Performance

Mechanically, there is almost nothing here to discuss, and that is the appeal. Fuel soaks the cotton wick, the flame warms the cup, and vaporizing alcohol is pushed out through a ring of jets around the top to make a steady, near-silent flame. No priming, no pumping, no valves, no parts that can clog. Owners routinely describe it as bulletproof, and a brass cup that has been in production for the better part of a century gives them little reason to argue.

Boil times are honest rather than exciting. Trangia rates the burner at roughly 1,000 W and about 10 minutes to bring a liter of water to a boil, a figure that holds in calm air with a close-fitting windscreen. Strip the windscreen away and the number stretches quickly, because an unpressurized alcohol burner has little spare heat to waste on a breeze. It will not race a canister stove to a rolling boil, and nobody should buy it expecting to.

Where it pulls ahead of most alcohol stoves is control. The included simmer ring partially covers the jets to turn the flame down, and closing it completely snuffs the burner. Alcohol stoves are notorious for being all-or-nothing; this one lets a cook hold a gentle simmer for real food instead of just rehydrating a bag. A full fill burns for around 25 minutes, so a pot of rice is within range, but a long braise is not.

The screw cap is the other quietly useful feature. Its O-ring seals the cup, so leftover fuel can stay inside between meals instead of being poured back into a bottle or left to evaporate. Long-time users add one firm rule: let the burner cool before capping it, and never use the cap to put out the flame. Doing so cooks the O-ring, and a replacement is the usual penance. The simmer ring is the intended snuffer.

Cold weather draws the usual alcohol-stove debate. Some hikers insist spirit burners fade in the cold, while an Alaska-based owner reports never having a problem and points out that mushers have long cooked on alcohol stoves during the Iditarod. Cleanliness gets a more unanimous vote. Owners who have moved over from homemade alcohol stoves report a clean burn with very little soot, particularly with clean-burning ethanol and the pot held at the right distance above the flame.

The most common complaint concerns what is not in the box. As one buyer put it, the burner is exactly what it claims to be, and the pot stand is the buyer’s problem. Expect some time spent comparing cross stands, triangle stands and DIY windscreens before the system feels finished.

Pros & Cons

Pros

• No moving parts, and nothing to service, clog or pressurize
• Simmer ring gives real heat control and doubles as a flame snuffer
• Sealed cap lets leftover fuel stay in the burner between meals
• Burns quietly and cleanly, with little soot reported by owners
• Runs on inexpensive alcohol-based fuels that are easy to find
• Fits all Trangia stove systems, so it works as a direct replacement part

Cons

• Sold without a pot stand or windscreen, so a usable setup needs more purchases or a DIY build
• Slower than canister or pressurized stoves, at about 10 minutes per liter in calm conditions
• Boil times lengthen noticeably in wind without a proper windscreen
• At 110 g, it is considerably heavier than a beverage-can or thin titanium alcohol stove
• Using the cap to snuff the flame can melt the O-ring

Who Should Buy This

The B25 suits hikers who already have, or want to build, a modular alcohol cook system and want the best-proven burner to anchor it. That includes people assembling a Clikstand or cross-stand rig, and anyone whose old Trangia burner has finally given out. It also suits cooks who want to simmer instead of just boil. Gram-counting thru-hikers who only ever heat water for freeze-dried meals will do better with a lighter can stove, and anyone who wants a complete kit out of the box should buy a full Trangia set instead.

Verdict

The Trangia B25 earns its reputation the unglamorous way: it lights, it burns, it simmers, and it keeps doing so season after season. It is slow, and it is only half a stove, but as the core of a sturdy alcohol cook system it is hard to beat. An 8 out of 10, held back only by the extra parts needed to make it cook dinner.