Direct vent fireplace inserts have better heating efficiency because they draw in outside air and use smaller ductwork for exhaust. Natural-vented fireplace inserts have the lowest heating efficiency since heat is lost through the open damper or flue. Gas fireplace inserts have varying percentages of heating efficiency, largely dependent on the unit’s venting type. Propane tanks avoid the need for gas line installation, but they require regular replenishment. Natural gas units often produce more heat (measured in BTU per hour), but they need to have a gas line installed. Gas fireplace inserts require either a natural gas line or a propane tank for fuel. In short, natural-vented gas fireplace inserts require vertical ductwork terminating at the roofline, direct vent models can use vertical ductwork terminating at the roof or horizontal ductwork through an exterior wall, and ventless models require no ductwork for exhaust. There are three primary venting types: natural-vented, direct-vented, and ventless. One of the most important things to know when buying a gas fireplace insert is the type of vent configuration you need. What to Look for in a Fireplace Insert Venting Type This option only outputs up to 21,000 BTU, but natural-vented gas inserts tend to produce more realistic-looking flames. However, if you are looking for a natural-vented option that exhausts through an existing chimney, then consider the Empire Keystone Deluxe B-Vent Fireplace ( view at Amazon). This ventless model puts out plenty of heat with up to 32,000 BTU and offers dual fuel options. The Duluth Forge FDF300R Vent Less Gas Fireplace Insert ( view at Amazon) is a practical choice for most homeowners. No matter which style you choose, the functional features of this gas fireplace insert make it a smart buy-a heat-activated blower with variable speed control distributes warm air into the room, a safety screen provides added protection, and a remote gives you quick control from anywhere in the room. You can choose between a louvered or solid surround, a traditional log set, or contemporary crushed glass interior, and either black, pewter, or copper exterior finish. While many gas fireplace inserts have a uniform appearance with a black metal surround and rustic-looking logs inside, this splurge-worthy option offers more choices. As a direct vent model, this insert sends exhaust up your existing chimney with a chimney insert or horizontally through an exterior wall with special ductwork.
With both natural gas and propane fuel options, you'll also get to decide whether to upgrade to IPI (immediate ignition) or standard millivolt ignition, which takes up to 30 seconds to light. More heat loss to flue than ventless modelsĬhoose the features and options that matter the most to you with this high-end gas fireplace insert from Kingsman Fireplaces. The Spruce Home Improvement Review Board.