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 is an attractive choice for those looking to add warmth and style to their outdoor spaces. With a BTU rating of 24,000, it offers a solid heat output suitable for medium-sized areas. The ventless design is a key feature, allowing for flexible installation without the need for a chimney or flue, which is convenient for many homeowners. It uses a versatile fuel system, operating on either natural gas or propane, adding to its adaptability to different settings.

The manual ignition system, along with the battery-assisted Piezo igniter, ensures a straightforward start-up process, although some users might prefer an automatic ignition system for ease of use. The aesthetic appeal is enhanced by its sleek stainless steel construction and the inclusion of reflective crystal glass media, which creates an eye-catching flame display. Its compact dimensions make it a good fit for spaces where room is a concern, though the slim profile may limit the breadth of the heat it can radiate.

In terms of efficiency, while no specific rating is provided, the vent-free nature often implies better heat retention within the space. However, potential buyers should be aware of the manual control limitations, which might not offer the precise temperature regulation found in more advanced models. Assembled in the USA, the unit promises quality craftsmanship with a focus on durable materials. This fireplace insert is particularly suited for those who appreciate style and flexibility in their outdoor heating solutions, but it may not satisfy users seeking advanced technological features or automatic operations.

The Duluth Forge Dual Fuel Ventless Gas Fireplace Insert is an excellent option for heating medium-sized spaces up to 1500 square feet. Its key feature is the ventless dual fuel capability, allowing easy switching between natural gas and liquid propane without the need for a chimney or external vent, simplifying installation and adding flexibility. With a strong heat output of 32,000 BTUs and an impressive 99.9% efficiency rating, it provides effective and economical warmth.

This insert includes a convenient thermostat control that maintains your room at the desired temperature automatically, eliminating the need for constant adjustments. Safety is enhanced by an oxygen depletion sensor that shuts the unit off if air quality decreases, helping to prevent harmful gas buildup. The fireplace also offers a classic look with six hand-painted ceramic fiber logs, a rustic wood mantle in slate gray, double mesh doors, and a sprayed brick liner, creating an authentic and attractive centerpiece.

Measuring 15 by 45 by 45 inches and weighing 161 pounds, the insert requires confirmation that your space can accommodate it comfortably, especially considering necessary clearance to the ceiling. Professional installation may be advisable. Since it is ventless, maintaining good room ventilation is important because all combustion air is drawn from inside the home. While its 32,000 BTU rating suits many living spaces, it may be less ideal for very large, open areas. This Duluth Forge model delivers a flexible, efficient, and stylish heating solution without the complexity of venting.