It is commonly stated that ventless=heat and vented=heat loss and just ambiance, but this is actually far from the case. In the hearth industry, technology has actually come a very long way since the days of open brick fireplaces. Our vented zero clearance fireplaces, fireplace inserts, and freestanding stoves are actually up to 89% efficient – almost all of the heat produced by these furnace-rated units is sent into your home as heat. Even our vented log sets for open fireplaces, which are not furnace-rated appliances, will send a small amount of heat into your home due to their high-quality materials and craftsmanship. On the other hand, many people assume that ventless units send 100% of their heat into your home due to the lack of a vent; however, because it is required to keep the windows open while burning them, there actually is heat loss occurring. CLICK HERE to learn more about ventless units!