Ignis Eco Hybrid Bio Ethanol Burner Ventless Ethanol Burner Insert EHB2400 Spill-Proof Technology - Adjustable Flame - Fuel Efficient Eco-Friendly - Doesn't Produce Any Smoke or Soot - Residential Grade No Chimney - No Gas or Electric Lines Required - Easy or no Maintenance Capacity 4 Liters - Approximate Burn Time 5 - 12 Hours per Refill - Approximate BTU Output  10000 3 Year Warranty - 3 mm 304 Stainless Steel - Double Wall Technology and Additional Safety Tray