Thanks! And they sure are not! Nope, just the one heater only. It got really warm in the camper. The temperature inside was in the mid 80's when I turned it off at 3 am. Just ONE heater. I was very happy. Brrrrr .... even in the 60's. I have a heated throw and I will take it with me in January and February. One of my daughters is using it on this trip, being in a tent. Her kids will be in the warm camper with us.