Warpfive Stirling Engines are fascinating eco-friendly devices which operate purely on heat and do not require any form of electricity. A Stirling engine converts temperature difference into motion and is noted for its high efficiency, quiet operation, longevity and the versatility with which it can use almost any heat source. Heat within the Warpfive Stirling engine is cyclically expanded and converted to mechanical energy which powers a fan. Warpfive Fans improve the heat circulation within your home, saving on heating fuel and providing you with a more comfortable living environment. Our fans quietly circulate the heat generated by your Range cooker or multi-fuel stove throughout your home resulting in increased heating efficiency, improved comfort and a reduction in operating costs. All Warpfive Stirling Engines are individually handmade and assembled in Great Britain. Each engine is fastidiously built and tested with great personal care.