View on LOZ Suggested Retail: $159.99. . Dyna-Glo 10,000 BTU Natural Gas Blue Flame Vent Free Wall Heater, White. Natural Gas Ready (Fuel conversion not permitted). Blue Flame Technology works by convecting heat to warm the air the same way as a central heating system. 5, 000-10, 000 BTU's/hr. variable heat output for up to 300 sq. ft. Variable control knob offers the most customizable heat settings LOW - 5, 000 BTU MED - 7, 500 BTU HI - 10, 000 BTU. No electricity required allows for reliable back-up heating incase of an emergency situation. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.