There’s no way those controllers are rated for the amperage a heater at full blast will pull. Most extension cords aren’t safe to use with heaters; you need to look for 14-gauge or lower to be safe with a decently powerful space heater, and even then it’s not ideal. 14-gauge can handle 12 amps/1440 watts at 120v, and most space heaters are 12.5 amps. They should be plugged into the wall, or heavy-duty extension cords.