Adding a ventless fireplace to an existing home

There’s a certain calm to the colder months of the year. It’s a time of encouraged comfort, when homes are hideaways from the increasing darkness outside, and chilly settings can be viewed from the safety of a warm room. One of the most classic scenes for such coziness is a crackling fire. But not all of us are lucky enough to live in homes with chimneys and flues—or even standalone homes at all. That's where ventless fireplaces come in.

“Ventless fireplaces are standalone structures that function off natural gas, propane, alcohol-based gels, or electricity, but do not require a vent or open chimney flue to heat a room like traditional gas or wood-burning fireplaces,” says Kaley Galinsky, fireplace and outdoor fire merchant at The Home Depot. “They are a good alternative for creating the same warm atmosphere.”

As the temperatures continue to cool, a ventless fireplace may seem like a worthwhile way to embrace the homespun quality of fall and winter. But there’s a lot to know about this product before it becomes a staple in your home. Galinsky outlines the pros and cons of a ventless fireplace, and includes three shopping tips to remember, so that you have the insight you need to feel at ease with your decision.

The Pros of a Ventless Fireplace

In order for a traditional gas or wood fireplace to operate, two vents need to be installed: One that brings fresh air in, and another that pushes fumes and debris out. Ventless fireplaces, on the other hand, are exactly as they sound. And that makes them more versatile.

“While traditional fireplaces can only be located in rooms with a flue, ventless fireplaces can be installed in virtually any room,” Galinsky says.

Their location can vary, but their flames will remain static. That’s because when natural gas, gel, electricity, or propane feeds into the unit, fire will emit from precise gaps in the artificial logs—which are usually concrete or ceramic, Galinsky notes. As the fire burns, its fumes pass back into the room rather than directly outside. A regulator inside the unit ensures that there’s a balance between gas and air running through the room, and many models include carbon monoxide detectors and oxygen detection sensors, too.

“A ventless option can even help homeowners save on utility bills, because there are no penetrations for the heat to escape outside,” Galinsky adds. “Wood burning, vented fireplaces can also pollute the air with ash and debris, so ventless models are viewed as a better choice for the environment and user’s health.”

The Cons of a Ventless Fireplace

While it’s clear that a ventless fireplace can be budget-friendly in relation to the installation and maintenance of its traditional counterpart, it’s not as clear whether they’re safer—and Galinsky recognizes this ongoing debate.

“As with any fireplace, high oxygen and carbon monoxide levels can be a concern,” she says, noting the importance of the aforementioned detectors. “For example, California completely bans the use of ventless fireplaces, and Washington, D.C. prohibits them in bathrooms and bedrooms. If not installed in compliance with local law, ventless fireplaces could result in fines or the removal of the model all together.”

Galinsky also notes that this is not a DIY job. “It is always recommended to have a professional help install a ventless fireplace, especially a gas or propane model,” she says. “Proper installation is key to maintaining a safe home and reducing the risk of issues now or down the road.”

Lastly, keep in mind that a ventless fireplace may produce an odor, since the combustion is circulated through the room. That process produces water vapor as a byproduct, too, so pay attention to signs of mold.

“Annual inspections are key to maintaining an efficient and safe ventless fireplace,” she adds. “Check the condition of the stationary logs inside the fireplace, and replace any that are chipped or fractured. You’ll also want to clean the logs every year.”

A custom-designed ventless fireplace from Hearth Cabinet.

What to Know While Shopping for a Ventless Fireplace

Choose a model that fits properly within a room. “This is not only for appearance, but also for air quality,” Galinsky says. “Installing a ventless fireplace that is too large for a room can produce excess moisture in the air, increasing the risk for mold or mildew. These fireplaces are measured by BTUs, or heat emitted per hour. Higher BTU models are meant for larger rooms, and lower BTU models are meant for smaller rooms.”

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Weigh the various costs. “Gel-based units require more upkeep and produce less heat, but are generally less expensive. And gas or propane-powered models can generate more heat but can be slightly more expensive,” says Galinsky. “It’s also worth noting the various features, from remote control capabilities to battery-assisted ignition, which can make owning a fireplace convenient and easy.”

Research their state’s regulations on ventless fireplaces. “You’ll need to ensure that the model you buy complies with the law,” Galinsky says. “While many states do not have regulations in place, it is best to research any local laws before making a purchase.”

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