Sure Heat AEVF24FALP American Elm Fully Automatic Vent Free Gas Log Set, 24-Inch, Liquid Propane Fully Automatic and CSA approved heating appliance will heat 1200-1500 square feet with 99.9-Percent efficiency Eight highly detailed, hand painted refractory cement logs traditionally stacked on a tiered grate realistically recreate the look of a mature fire Fully automatic electronic ignition valve system means the pilot is only lit when the logs are in operation; This reduces gas usage saving you money Digital remote control for a choice of three flame heights, adjusting the unit's thermostat and on/off control, all without leaving your chair 99.9-Percent energy efficient; Oxygen Depletion Sensing (ODS) safety shutoff system turns off the unit if there is not enough fresh air