I used a ceramic heater for the birds before I put in my propane heater. Problem is there is very little air convection movement in a large room and I needed to run a fan to blow the hot air around the room. The radiant heat effect only lasts up to four to six inches away from the HOT ceramic surface. I had the panel mounted behind the canary cage on the wall and then had the cage as close to the wall as I could get it.
The propane furnace is much more efficient for heating the whole room. I think that electric heater would do the job, but I would run it outdoors for three to six hours before using it in the birdroom to burn off any chemicals on the heating elements.