What is the largest ethanol fireplace for my room?

To calculate the maximum size of ethanol fireplace for your room, you first need to figure our how many cubic feet your room is: simply multiply room length by width and by height. Ethanol fireplaces need to have 200 cubic feet per each 1000 BTUs they produce. So, for example, if you have a 1200 cubic feet room, the largest ethanol fireplace for this room would be the one that produces 6000 BTUs (1200/200 x 1000).