We developed Winter Gas to increase the performance of gas stoves at lower temperatures. Low temperatures reduce the pressure in the gas tank and worsen the evaporation of the liquid gas. This causes the stove to burn with less power or not at all, even though there may be gas left in the container. The main innovation behind the improved cold weather performance of Primus Winter Gas is VaporMesh. VaporMesh is a highly absorbent paper that sits around the entire inside of the container, thus increasing the surface area from which the liquid fuel evaporates to gaseous form. This helps keep the pressure higher which makes the stove burn better. The widened surface area also speeds up the liquid to gas transformation process, and it is this rapid transformation that determines the pressure inside the container. Fast process = high pressure.
Compared to conventional gas containers, this is what gives Winter Gas its reliable performance, even in cold conditions where it was previously impossible to use gas.
This is how Winter Gas maintains a smoother performance.
The phase transition takes place from both paper and surface instead of only the surface of the container as with a conventional gas container. In this way, the surface area is expanded without requiring a larger container. This increases the pressure in the gas tank.
The VaporMesh paper and gas mixture increases the speed of the phase transition from liquid to gas. The burner receives more fuel, which means that the cooking time in really low temperatures will be shorter compared to other gas containers.
A type of paper that coats the inside of the container and absorbs the gas in its liquid form. The effect of the VaporMesh paper intensifies as the fuel level decreases, and the gas gets a smoother performance over the lifespan of the gas tank.
The mixture of propane and isobutane gas is the same as that of Power Gas: around 20% propane and 80% isobutane.
The year that Winter Gas was launched, it won the Outdoor Industry Award GOLD MEDAL at the 2014 Outdoor Trade Show for demonstrating innovation and drive in the area of combustion and heating. The award is considered one of the most prestigious worldwide - with only seven gold winners in total in 2014. The gas also won in the categories of “Camping Equipment” and “Product of the Year” at the Outdoor Trade Show 2014. The Outdoor Trade Show is the UK's largest outdoor fair. In 2015, Winter Gas won another prize: “Editors’ Choice” of the German newspaper Outdoor.