Does it heat without the flame on?

Yes. The heater and the flame effect run separately, so you can use it as a plain space heater or as flame ambiance with no heat.

What room size does it suit?

Infrared quartz units like this are best for supplemental heat in a single room. They warm people and objects in front of the unit rather than a whole open floor plan.

Does it need venting or a chimney?

No. It plugs into a standard outlet and needs no venting, gas line or chimney, so it works in apartments and rooms without a fireplace.

Can I set it to turn off on its own?

Yes. It has a timer, so you can set a run time and let it shut off by itself.

Does the remote control the heat and the flame?

The remote handles the unit's settings, so you can adjust the flame and heat without reaching the cabinet.

Is it safe to leave running unattended?

Follow the manufacturer's instructions on clearance and unattended use. Keep it clear of curtains and furniture and plug it directly into a wall outlet.