The Heater on Dimplex Opt-Myst electric fireboxes is 1000 watts 120 volts and is good for supplement heating up to 400 sq. feet
The heater works independently from the Opti-Myst cassette so it's efficiency is not affected by the water vapor productsion.
Electric fan-forced heaters are 100% efficient, meaning that all energy input goes into the room as heat.
Related Products:
Dimplex Opti-Myst 46" Firebox
Dimpled Opti-Myst 66" Firebox