Many years ago on the East Coast I had one of these in my fireplace and it worked really well. They fit inside your fireplace and your fire heats up the pipes which draws on cool air from the room floor and blows heated air out the top by convection. No moving parts.
I have been looking for one in Toronto for a long time with no luck. Have any of you seen them in the city?
They seem quite expensive to buy on ebay with shipping (they are steel and heavy) so getting one locally would be the answer.