Hot and Efficient Cast Iron Gas Fire Inserts - Integra Pre-Cast Flue Gas Fire Range. High Efficiency, Heat Output Gas Fires with Cast Inserts. Most gas fires supplied with a cast iron insert tend to be for decorative purposes only. They don't offer much in the way of heat nor are they suitable for modern homes with pre-cast flues. The Integra Pre-cast range boasts a highly efficient, realistic gas fire with a high heat of 3.3kw and an efficiency approaching 50%. Please find below a wide section of: High Put Cast Iron Inserts High Output Tiled Inserts High Efficiency Cast Inserts High Efficiency Tiled Inserts Cast Iron Gas Fire Inserts Tiled Cast Iron Gas Fire Inserts Integra Pre-cast Flue Gas Fire Range Sort By: Default Title - A to Z Title - Z to A Price - lowest first Price - highest first Time Added - latest first Popularity - most popular first Sales - best selling first Agnews Majestic Integra Cast Iron Insert   A High Output, High Efficiency Multi Flue Gas Fire with... Agnews Washington Integra Cast Iron Insert   A contemporary cast iron insert, available with a high output...   Ok