Is this heater safe to use indoors?

It is non-vented, so it releases combustion gases and moisture into the room. Use it only in a well-ventilated space such as a garage with a door or window cracked open, and never in a sealed bedroom. The flameout sensor and overheat shut-off add protection but do not replace ventilation.

How much space will 80,000 BTU heat?

Dyna-Glo rates it for about 1,900 square feet. That figure assumes an open, poorly insulated space like a shop or barn; a divided or well-insulated room warms faster, while a windy, uninsulated building may fall short.

Does it need electricity?

Yes. The fan, ignition and thermostat draw about 170 W, so it needs a standard outlet. It will not run during a power outage the way a wick heater can.

What fuel does it use, and how long does a tank last?

It burns kerosene, not diesel or propane. Runtime depends on the thermostat setting and outdoor temperature, so expect shorter runs on the coldest days and longer ones in mild weather.

How does it compare with a propane torpedo heater?

Both are forced-air, non-vented designs. Kerosene generally smells less and burns cleaner than propane, but fuel costs more and is harder to find. Propane units are easier to refuel from a tank.