Is this heater safe to leave on overnight?

It is designed for unattended use with a thermostat that cycles the element on and off, and the oil stays sealed inside the fins. The outer surfaces still get hot, so keep it clear of curtains, bedding and furniture.

How is it different from a fan heater?

It has no fan, so it is silent and does not blow dust or dry the air. It warms a room more slowly, but the fins keep radiating heat after the element switches off.

Does it need oil or maintenance?

No. The oil is sealed inside the fins for the life of the unit, so there is nothing to fill or change. Wipe the exterior when it is cool and unplugged.

What rooms does 1500 watts suit?

It works best as supplemental heat in a bedroom, office or similar closed room. Large open spaces and whole-home heating are beyond what a single portable radiator covers.

Can I set it to come on at a certain time?

Yes. The digital controls include a programmable timer and adjustable thermostat, so you can schedule when it runs and set the target warmth.

Does it have a tip-over or overheat shutoff?

De'Longhi builds its oil radiators with thermal cutoffs and safety switches for overheating and tip-over. Check the unit's own markings and manual for the exact safety features.