Vanguard Vent Free Gas Log Heaters. We are selling 2 gas log heaters for fireplaces. One is golden oak and the other one is white birch. We hooked up to natural gas and these are PROPANE ONLY. Both are 24 inch units and heat 20,000 to 39,000 btus. They are 28 pounds each. We paid $300.00 a piece and are asking $150.00 each. They are in good working order.