The BF-30 offers the visual warmth of an alluring blue flame with a hydraulic thermostat that modulates from 8 500 BTU to 30 000 BTU for continuous temperature control BF–30 Blue Flame model contains modulating hydraulic thermostat which upon reaching your preset comfort level cycles the main burner flame from HI to LO and when the thermostat is satisfied to OFF while leaving the PILOT on this reduces the large flame to a smaller flame while still emitting heat Empire Vent-Free Heaters are virtually 100% fuel efficient No heat is lost since the BF-30 does not require outside venting Empire Vent-Free units do not require electricity to operate Total comfort for half the cost of electric heat Safe operation with auto shut-off safety controls Mounts on floor or wall

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More info: Empire 30,000 BTU Vent Free Blue Flame Heater - BF-30