Gas logs are fast becoming very popular in the United States as a way to supplement home heating methods. They come in two different models: Vented and unvented. You will need to decide if your home is best suited for unvented gas logs. An important thing to remember is that they burn very hot so less carbon monoxide is expelled. With vented logs, more harmful gas is given off, so they need a venting system to expel harmful toxins away from your home. If you think that you want the ventless version, then keep in mind a few things. You will need to compare it to a vented version and decide which one is more efficient and attractive. You will also need to check local building codes to make sure ventless logs are legal in your area. And, because ventless logs burn so hot, you want to make sure that your fireplace is away from all combustibles.