The Martin MDV12N is a direct vent wall heater designed to deliver 11,000 BTU of natural gas heat for comfortable zone heating. Its built-in thermostat helps maintain a consistent room temperature while adjusting flame output to reduce overheating, gas waste, and noise. The heater features a heavy-duty die-cast aluminum grill for improved heat flow and a design that keeps the back of the unit near room temperature. It operates without electricity, making it a dependable heating solution during power outages as well as everyday use.