Although it has never happened to us, a fire in a animal house facility is not pleasent to be around.
There are some situations where you do need to heat.
If you are in a cold climate and do not have enough poultry so they keep each other warm.
You didn't get the coop insulated, for some reason, or don't have an insulated coop.
Not all variaties of poultry are considered hardy enough to live in cold climates.
There are some things you can do.
1.Keep the heater clean, no matter what kind you have. Keep it clean by blowing the dust out if it, an make it a weekly habit. It should also be a portable heater so you can remove it from the coop to clean.
2. Use heater with a tip sensor, That is if it is accidently tipped over it shuts off.
3. Put a shroud or shield around the heater so the poultry does not get to close to it.
4. Use a radiant heater if possible, one that does not have any exposed heating elements. But still keep it clean.
5. Make a stand so the heater does not set on the floor next to your litter.
To heat or not ends up being a personal choice, as most of time it is not really needed, except in some unsuall circumstances.
In our case we heat, but only to about freezing.
Tom