I don’t know for sure with this one, but I would guess at 800 watts it’s probably close or better than those larger edenpure ceramic heater things. Those are usually 1200-1500watts. The difference is those kick on and off. These you can run steady at different watts to keep the room temps steady. Esp if you use light fans or ceiling fans to spread the air.

I can heat my 1200sq ft basement to 68-70 degrees in the middle of winter at about 500-600watts from an old S9 and that thing is old as fuck.