Question: are gas log fires energy efficient?
Answer: So an open Living Flame Fire on Low with a similar Efficiency in most cases is fine burning just 3.5KW of Gas. Flueless Gas Fires are the most efficient at 100%. ... They are room sealed Flued through an outside wall and are up to 90% Efficient (No Air Changes Per Hour). Then we have Glass fronted into a Chimney/Flue.