Greenhouse Heater. Top Quality Product. Sturdy steel construction. 5 Litre capacity tank. Burns up to 40 hours per filling. Adjustable quality brass twin burner. Large wide flat base for greater stability. Flame extinguishing device. Ideal for Greenhouse and Garden frames. Protects against frost. Promotes germination and growth. Generates CO the main food of plants. Fully guaranteed. Comes fully boxed with instructions.