Wood fireplace inserts are specially designed units that fit into existing masonry fireplaces. They enhance heating efficiency by burning wood more effectively and producing more heat than traditional open fireplaces. These inserts are typically made of cast iron or steel and come with glass doors to improve safety and visibility of the flames. Installing a wood fireplace insert can help reduce heat loss and improve air quality by minimizing smoke emissions. Many models are equipped with advanced features like catalytic converters, which further increase efficiency. Overall, they provide a cozy ambiance while being a more sustainable heating option for homes.