How fast does it heat a room?

The ceramic element warms within seconds and the fan pushes that heat out, so you feel it almost immediately. A 1500 W heater realistically takes the chill off a small room rather than heating a large open space.

The fan is the only sound. On low it is close to a quiet desk fan; on high it is clearly audible, which matters if you sleep or take calls near it.

Can I leave it running unattended?

PTC ceramic heaters are generally safer than exposed-element heaters, but any 1500 W portable should be watched. Keep it clear of curtains and furniture and unplug it when you leave.

Does it need assembly or installation?

No. It is a plug-in portable tower, so it works out of the box on any standard outlet. There is nothing to mount or wire.

How does it compare with an oil-filled radiator?

The Dexso heats up far faster and is easier to move. An oil radiator holds heat longer and stays silent, but takes much longer to warm up and is heavier.

Will it raise my electricity bill much?

It draws up to 1500 W whenever the element is on, the same as most portable space heaters. Running it for hours adds up, so use it to heat the room you are in rather than the whole home.