10 Best Gas Fireplace Inserts 2026 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 Dual Fuel Ventless Gas Fireplace Insert offers a strong 32,000 BTU heating capacity, making it suitable for warming spaces up to 1,500 square feet. Its ventless design means you don’t need a chimney or outside duct, which simplifies installation and saves space. One standout feature is its flexibility to use either natural gas or liquid propane, providing convenience depending on your fuel availability. The included remote control with an LCD screen and manual flame adjustment adds easy, modern operation. Aesthetically, it has a realistic look with six hand-painted ceramic logs, a mesh double door, and a sprayed brick liner that can nicely complement many living rooms. The compact size allows for wall mounting or recess installation, fitting well in various spaces.

The unit also scores high on efficiency at 99.9%, meaning most of the fuel converts to heat, which helps keep energy costs lower. However, being ventless means it relies on indoor air circulation and may not be ideal for tightly sealed rooms without proper ventilation. It requires 7 AAA batteries for the remote, which might need occasional replacement. Also, although it’s advertised as safe with push-button ignition and zero-clearance installation, ventless units can produce some indoor moisture and combustion byproducts, so proper use and room monitoring is important. This insert suits homeowners looking for a powerful, easy-to-install heating solution with dual fuel options and modern controls, especially where adding a chimney is not practical.