Homeowner Safety and Fireplace AlternativesImproper installation, improper fireplace sizing, improper use, and appliance failure can all lead to major safety issues. In fact, health concerns over the use of this appliance have led some countries and states within the US to ban vent-free gas fireplaces. Still, too many homeowners covet the low installation and operating cost and only want to use their fireplace on a limited basis. If you're one of these homeowners, at the very least try to find a contractor/manufacturer who will bear the responsibility for product failure, should something go wrong. Ask these professionals and companies about health concerns. If they dismiss these concerns as foolish myths, you should probably run for the door. On the other hand, if they tell you there are some concerns, but they've never had any problems with their fireplaces, ask them to put in writing that they will cover any damages and expenses associated with product failure.
Your best bet remains to simply put up the extra money and install a vented fireplace. It may cost a little more and not be as energy-efficient, but saving a few dollars on your utility bill shouldn't be as important as the health and safety of your household