If your camping neighbor does not have a roaring fire by 6AM, or you're wild camping and starting to get the shakes, this MSR Dragonfly camp stove will get a quart of water boiling in less than a snap. It runs on white camp gas, and the whole setup is not cheap, but this is a huge "buy quality, cry once" moment.
A cheap camp stove can be ineffective and dangerous. Follow all instructions on every camp stove very carefully so that you do not incur tragedy. Never, never run your camp stove inside your tent, no matter how cold it is. You run a very real risk of burning to death with no easy exit.