Has anyone used one of these for heating?

I want something I can leave on when I'm not home for the pets. This
looks like it would be safe. No open element, no fumes.

I've decided to stop using propane heat because of the cost. I live by
myself and only intend to heat the central living area of my living
room/kitchen/dining room. The total area is about 600 square feet and
I would use the ceiling fan to circulate the warm air.

****
UL Listed
Manufacturers one-year warranty
600/900/1,500 triple watt heater. Heating element is factory-sealed in
mineral oil; oil is safely heated internally. No fumes, no flames.
Thermostat maintains temperature with automatic on/off cycles.
Seven-fin steel cabinet with easy rolling wheels. 7-ft. line cord with
high-temperature plug.
****

If there is anyone out there that uses this heater, would it heat this
size area?

Jacksonville Florida is the area I live in.

Thank you for any help you may have for me.