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No, it is not safe to leave a propane heater on overnight. Even if you’re using the heater in a well-ventilated space, the heaters can emit carbon monoxide that can lead to fires. Be sure to fully turn off and secure the propane heater before clearing the area. 

Generally, an oil furnace is considered safer than a gas furnace for several reasons. While both types of furnaces can produce carbon monoxide, a leak in an oil furnace is easier to detect due to the smell. Oil furnaces also don't connect to a gas pipeline, which reduces the chance of a fuel leak. Most importantly, heating oil is not combustible, whereas natural gas is highly flammable. This means there is a much lower risk of combustion or explosion with an oil furnace. However, an oil furnace can still pose a fire hazard if it tips over.

There are several maintenance tips you should take to ensure your pellet stove's safety and proper maintenance. You should vacuum the ash pan every week to prevent overflowing and clean the stove and surrounding vents every three to four months. It’s also important to get a professional inspection every year and install a carbon monoxide detector close to your stove. Be sure to dispose of hot ashes in a closed metal container; store it outside, away from the house. Only use the pellets recommended by your stove's manufacturer, and follow any cleaning and maintenance instructions.

The short answer is yes, but the longer answer is more complex. Unless the fireplace is ventless by design, you’ll need some type of exhaust pipe system to safely send fumes and other harmful byproducts out of the house. Even then, ventless fireplaces are not always permitted because they do keep the byproducts inside of your house. Ventless fireplaces are safest when installed in spaces that are themselves well-ventilated, like large rooms with lots of windows.