Technically, no, but there still is a fire hazard. Oxygen itself is not flammable. It does, however support the burning of flammable substances; this is how fires burn normally. Oxygen tanks provide pure oxygen (nearly 5 times the natural concentration), which means that any flammable substances in contact with it will be more easily ignited and will burn hotter and faster if a fire starts.
In space there is no oxygen. Space is a vacuum. All things like a rocket going to space, require a fuel to burn, oxygen and a heater. Since there is no oxygen is space they need to provide it for them. Meaning the reaction can take place correctly.
bob
Yes. In modern warfare, bombs are often ignited whilst they are above the ground. In space there is no air, but most conventional explosives contain substances that produce oxygen for the reaction. So they will work in a vacuum. Nuclear explosions also do not require oxygen. So Yes.
It is safe to have a space heater, but it does have risks like anything else. If someone wants to use a space heater, they should be very careful.
chemical
Molted wax, ignited cotton thread and oxygen.
Launching of Sputnik
Valco Infrared heater can be used as a space heater. The can save you lots of money on energy costs.
It's integrated into the oxygen sensor. Buy a new oxygen sensor and you get a free oxygen sensor heater.
Right upstream oxygen sensor heater failure.Right upstream oxygen sensor heater failure.
You have a mixture that can be easily ignited to form water vapor.
The local hardware store, or online at various stores. Just google "space heater".