Ashley model AGDV20L and AGDV20N - 17,000 BTU is the perfect heater to add soothing comforting warmth to your smaller-size spaces. The slim, compact design of each unit allows it to tuck out of the way on any outside wall. It uses no electricity and is ideal for bedrooms or studies since each unit vents directly to the outside. This wall furnace will add endless comfort to any home or office.