I have a used Superior Electric Superlectric automatic instant heater. It quickly heats any room. The unit can be set for a desired temperature and it will turn on and off automatically as the room temperature changes. A built-in fan provides rapid heat circulation. A safety switch turns the unit off automatically if it is tipped over. It has low and high heat settings and six heating grades, It is lightweight and has a handle so it can be carried easily from one room to another. It measures 36 inches long, 5 inches wide, and 7 inches tall. It works great, and I have the original user's manual.