Direct vent fireplaces from eFireplaceStore produce more heat because they pull air from outside of the home for combustion. This is also the reason that they can be installed in smaller rooms like bedrooms and bathrooms. And the glass panel in front of the fireplace makes them safer for homes with children. You never have to worry about someone reaching into a lit fire.
If you don't have, or want a chimney, a direct vent fireplace from eFireplaceStore don't need require vertical venting. Direct vent fireplaces can be vented horizontally. All you need to do is vent your fireplace on an outside wall and run a few inches of pipe to the outside to complete your venting system. It's a perfect solution that doesn't require a lot of changes for your home.