10 Best Gas Fireplace Inserts 2025 in the United States

The Duluth Forge Dual Fuel Ventless Gas Fireplace Insert is a versatile heating option designed for rooms up to 1,500 square feet. Its standout feature is the dual fuel capability, allowing you to use either natural gas or liquid propane without needing a chimney or vent—making installation simpler and more flexible. With a strong heat output of 32,000 BTU, it efficiently warms medium-sized spaces, while its high efficiency (99.9%) means it uses fuel economically.

Controlling the temperature is easy thanks to the built-in thermostat, which automatically adjusts the heat to keep your room comfortable. The ignition system is battery-assisted with a safety sensor to detect low oxygen or carbon monoxide, shutting off the unit to keep your home safe. Aesthetically, it offers a classic look with a hand-painted wood finish, six realistic ceramic logs, and a furniture-grade mantle with subtle distressing, which can nicely complement traditional home decor. The inclusion of mesh doors and a brick-patterned liner enhances the authentic fireplace feel.

The unit is fairly large and heavy (over 70 pounds), which might require careful measuring to ensure it fits your intended space, especially since you need at least 42 inches of clearance above. Because it’s ventless, some users may notice a slight increase in humidity or odors, which is common with this type of fireplace. This fireplace insert is a solid choice for those wanting a reliable, efficient heater that combines flexibility in fuel use with a classic look, and who have a space that meets the size and clearance requirements. It suits living rooms or areas where venting options are limited but a cozy, traditional fireplace feel is desired.

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.

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.