How big a room can these heaters realistically warm?

Most 1500W ceramic units in this roundup are rated for roughly 100 to 300 square feet. Community reviewers in r/KitchenStack describe solid real-world performance in a typical 200 sq.ft. room, while the larger tower models (rated up to 270 to 300 sq.ft.) take the edge off bigger spaces. For very large or poorly insulated rooms, reviewers across the board suggest tempering expectations.