The Dyna-Glo Blue Flame Ventless Propane Heater for Ice House adds supplemental heating without access to a chimney or flue. Because it does not operate on electricity, this liquid propane heater is ideal for emergencies when the power shuts off or general everyday supplemental heating. Equipped with blue flame heat technology that operates similarly to a central home heating system, this Dyna-Glo propane heater supplies supplemental heat with even distribution and natural circulation with 99.9 percent efficiency. The adjustable heat control provides up to 10,000 BTUs of supplemental heat to spaces of up to 300 sq ft, making this vent-free heater an ideal addition to a lodge, icehouse, or bedroom. Heat Control: Customize your preferred heat setting with the low-medium-high variable control knob. Oxygen Depletion Sensor: An ODS instantly shuts the heater off if it detects insufficient oxygen or any trace of carbon monoxide. Electronic Push Button: A battery-assisted igniter requires one continuous press for quick and effortless ignition. Propane Tank: This blue flame heater requires a 20 or 40-pound tank (not included). Note: This product is not for sale in California or Canada. Before purchasing, please check your local and state regulation codes for vent-free heater requirements and restrictions. Installation and service must be performed by a qualified installer, gas supplier, or service agency. Field conversion is not permitted.