Does it need a chimney or vent?

No. It is vent-free, so it runs without a flue. That also means combustion byproducts and moisture stay in the room, so a small room needs some air movement.

How much space will it heat?

At 10,000 BTU it is a supplemental heater for a small room, such as a bedroom or den. It will not carry a large or open-plan living area.

Can it be installed in a bedroom or bathroom?

Vent-free units are often used in bedrooms, but local codes restrict vent-free appliances in small or poorly ventilated rooms. Check your local rules before installing.

Is the mantel included?

Yes. It ships as a mantel cabinet with a pewter finish, so you don't need a separate surround. The unit is about 26.7 inches wide, tall and 11.25 inches deep.

Does it have a thermostat or remote?

The listed specs show a fixed 10,000 BTU rating with no thermostat or remote mentioned. Confirm the control type with the retailer before buying if you want one.

Is it safe to leave running?

Vent-free fireplaces are designed for supervised use, and many include an oxygen depletion sensor. Follow the manufacturer's clearances and never block the unit.