Why do standard gas stoves fail when the temperature drops below freezing? It’s not bad luck; it’s physics. Discover how Optimus stoves use intelligent engineering to conquer the cold. 

There is nothing quite like a hot meal after a long day of winter snowshoeing or mountaineering. But many cold-weather campers have experienced the frustration of a gas stove sputtering and dying, even when the canister is half full. Why does this happen, and how does Optimus engineering solve it?

The Problem: Evaporative Cooling Standard backpacking stoves run on a mix of pressurized liquid butane, isobutane, and propane. When you open the valve, the liquid depressurizes and turns into a gas, which then burns. However, this phase change (from liquid to gas) requires heat—which it pulls from the canister and the surrounding air. This is called evaporative cooling.

As you cook, the canister gets colder and colder. In winter conditions, the temperature of the canister can quickly drop below the boiling point of the fuel inside (butane stops vaporizing at around -0.5°C / 31°F). The fuel stays liquid, the pressure drops to zero, and your stove dies.

The Optimus Solution 1: Liquid Fuel Technology To completely bypass the canister problem, serious mountaineers turn to liquid fuel stoves like the Optimus Polaris Optifuel. Instead of relying on the ambient temperature to vaporize the fuel, you manually pressurize a fuel bottle using a built-in pump. The liquid fuel (like white gas or kerosene) travels through a brass generator tube that crosses directly over the burner flame. The intense heat of the flame instantly vaporizes the liquid fuel inside the tube before it hits the jet. This physical pre-heating process guarantees maximum heat output, whether it is +20°C or -20°C outside.