The ventless fireplace is a new invention relative to the history of the fireplace. The vent free gas fireplace is so efficient that the only gasses emitted are carbon dioxide and water. Because of the complete combustion, these devices do not need a chimney or any outside venting. Because of these attractive features, ventless gas fireplaces are rapidly gaining in popularity.
Ventless fireplace inserts make for an almost ideal and low cost retrofit. When comparing ventless fireplaces to other heating sources (such as an electric fireplace insert), consider that a ventless fireplace will still work in the event of a power outage – unlike an electric fireplace.
The high efficiency of the ventless fireplace is a double edged sword. They are highly efficient (read low operating cost), but have protection devices to shut them down if their efficiency should decrease for any reason. Inefficient combustion can release toxic chemicals – most notably carbon monoxide. A ventless gas fireplace is required to have an oxygen depletion sensor to shut it down in the event that oxygen in the room becomes too depleted. However, because ventless fireplaces burn completely, and the gasses are not vented outside, they achieve 100% efficiency in heating your home.
Ventless fireplaces should be checked and serviced annually. The most convenient time to do this is at the start of the burning season. Regular maintenance should include checking the air shutters for proper air flow. The oxygen depletion sensor should also be tested to ensure that it is working properly.
A vent free gas fireplace can put a lot of moisture into the air. Because of this, humidity in your house should be a concern. You may need to use an appropriately sized dehumidifier to combat the output. Be wary that a ventless fireplace can complicate any existing mold problems. Also, check with your manufacturer as they may have a recommended maximum time to continually run your fireplace in order to properly combat moisture generation.
A ventless fireplace can be operated with a metal fire screen, but glass doors should not be used. Heat and gasses can build up behind glass doors which can lead to several safety hazards.
The price of a ventless gas fireplace typically starts at $500 and goes up from there. Be sure to have a used ventless fireplace properly inspected and tested before purchasing.
I hope this article has given you some insight on to the major touch points of ventless gas fireplaces. They are a wonderful and incredibly efficient invention, but their operating requirements need to be carefully understood.