10 Best Gas Fireplace Inserts 2026 in the United States

The Empire Comfort Systems 36" Direct-Vent LP Millivolt Control Fireplace is a solid option for a freestanding propane gas fireplace insert. It offers a heat output of 26,000 BTUs, suitable for warming a moderately sized room of around 320 square feet. The direct vent system vents outside, improving indoor air quality and efficiency. This unit runs on liquid propane and includes ceramic logs, a burner, tempered glass, and a decorative herringbone ceramic fiber brick background that enhances its modern look with an antique textured finish.

A notable feature is the millivolt control with an on/off switch that works without electricity, allowing it to provide heat during power outages—helpful for reliability. The adjustable thermostat lets you control the temperature for comfort and energy savings. The fireplace's dimensions (approximately 40 inches wide by 38 inches high and 20 inches deep) make it suitable for spaces where a freestanding unit is preferred, but measuring your space carefully is advised. The flame effect looks realistic and cozy, contributing nicely to room ambiance, while the ceramic burner and tempered glass ensure durability and safety.

This model balances heat output, style, and power outage functionality, making it a strong choice for those seeking dependable heating without electric reliance. Keep in mind the fireplace barrier screen or door set needs to be purchased separately to complete installation and ensure safety.

The Duluth Forge Ventless Stainless Outdoor Gas Fireplace Insert offers 24,000 BTUs of heat, which is sufficient to warm a moderate outdoor space comfortably. It operates on natural gas or propane and features a manual control ignition, requiring you to turn it on and adjust the flame yourself without an automatic ignition system. Being ventless, it doesn’t need a chimney or vent pipe, simplifying installation and saving space, which is especially useful for a clean look or limited room.

This insert has a slim, rectangular design that fits easily into existing setups or wall mounts. It uses a stainless steel H-burner with reflective copper glass media, creating a visually appealing flame effect that adds style without the need for logs. Made with high-quality materials and assembled in the USA, it is designed to be fuel-efficient by providing warmth without excessive fuel use.

Since it is vent-free, it may not be suitable for all indoor spaces due to ventilation concerns, and the manual control means less convenience compared to models with remote or electronic ignition. Weighing only 10 pounds, it is relatively easy to handle during installation. If you want a straightforward, stylish outdoor gas insert that offers warmth and ambiance without a complex setup, this model is a solid choice, though manual operation and proper placement for safety and comfort should be considered.

The Duluth Forge Dual Fuel Ventless Gas Fireplace is a versatile insert designed to heat spaces up to 1,500 square feet with a strong 32,000 BTU output. Its standout feature is the ability to use either natural gas or liquid propane, giving flexibility depending on your home's fuel setup. Being ventless means it doesn’t require a chimney or ductwork, making installation easier and less costly, but it needs proper room clearance and good ventilation for safety. The fireplace comes with a stylish antique white mantle and six hand-painted ceramic logs that look realistic, adding a cozy, classic feel to your living space. The remote control with an LCD screen lets you easily switch between manual and thermostat modes to maintain your preferred temperature without hassle.

With an efficiency rating of 99.9%, the unit converts most of the fuel into heat, helping save on energy costs. Safety features include an oxygen depletion sensor that shuts off the unit if air quality drops, along with a reliable battery-assisted Piezo ignition system. The unit is fairly large (45" wide and deep, 15" high), requiring a good amount of space and clearance, which may limit its fit in smaller rooms. Additionally, as a ventless model, monitoring indoor air quality and following installation guidelines carefully is important to avoid ventilation issues. This product is well suited for homeowners seeking an easy-to-install, efficient heating solution that offers fuel flexibility combined with attractive design, while those with smaller rooms or a preference for vented systems might consider other options.