7 Best Gas Fireplace Insert For Old Fireplaces (October 2026)

The Touchstone Fireplug 38″ Smart Electric Fireplace Insert is a standout for integrating modern technology with traditional fireplace aesthetics. Its compatibility with Alexa and WiFi allows for effortless control via voice commands or a smartphone app, adjusting flame colors, heat, and timers. You’ll appreciate the realistic flame effects, complete with crackling sound, and the supplemental 1500W heater that warms up to 400 sq. ft., all without the mess of gas or wood.

Installation is designed for existing fireplace openings, requiring careful measurement beforehand. While the heat is supplemental and not intended as a primary source for large areas, its smart features and realistic ambiance make it ideal for tech-savvy homeowners seeking convenience and visual appeal. If you want a low-maintenance, connected fireplace experience, this insert is an excellent choice.

This Duluth Forge fireplace insert is a powerhouse, offering a robust 32,000 BTU output that can heat up to 1,500 sq. ft. Its dual-fuel capability, allowing you to switch between natural gas and propane, adds significant flexibility. The inclusion of a remote control with an LCD screen for on/off and flame adjustment is a major convenience, making it easy to manage your comfort from across the room.

While the 99.9% efficiency is impressive, remember this is a ventless unit, so ensure your space is adequately ventilated as per safety guidelines. The realistic logs and sprayed brick liner provide a cozy aesthetic. It’s an excellent choice for those prioritizing powerful, convenient heating and the flexibility of fuel options.

This Real Fyre Split Oak gas log set is designed to bring a highly realistic fire experience to your vented natural gas fireplace. The G45 dual-flame burner creates impressive flame depth, extending through the logs and ember bed for a fuller, more natural look. Crafted with steel-reinforced refractory ceramic, the hand-painted logs are durable and detailed, backed by a limited lifetime warranty, ensuring long-lasting beauty and performance.

It’s crucial to note this set is for vented natural gas fireplaces only and uses a match-light system with your existing key valve; no remote is included. The high 90,000 BTU output provides a substantial flame. If you have a vented natural gas fireplace and prioritize authentic aesthetics and robust construction, this set offers a premium upgrade.

The Comfort Glow 24-inch gas log set offers convenient heating with its dual-fuel capability (natural gas or propane) and an adjustable thermostat for maintaining your desired room temperature. Its ventless design ensures maximum heat efficiency, warming up to 1,000 sq. ft., and the double yellow flame burner provides a lively fire effect. The inclusion of lava rocks adds to the realistic ambiance, making it a great option for retrofitting existing fireplaces.

It’s important to note that due to the ventless design and ODS system, this unit may not be suitable for high altitudes or certain regions (check local codes). The thermostat offers automated heat control, a significant plus for comfort. If you seek an easy-to-use, ventless gas log set with automatic temperature regulation for supplemental heating, this model is a strong choice.

This ProCom ventless firebox insert is a solid choice for updating your existing fireplace, especially if you need a zero-clearance design. Its unique airflow technology promises better heat distribution, and it’s versatile enough to accept most 18″ to 30″ ventless gas log sets. The decorative brick liner and large viewing area add a nice aesthetic touch, making it a practical and stylish upgrade.

While it’s designed for easy installation against or recessed into walls, ensure you have a gas line accessible. It’s a great option for homeowners looking to add ambiance and supplemental heat without major structural changes. Consider this if you value American assembly and a dependable firebox for your chosen log set.

This ProCom 36-inch universal ventless firebox is designed for maximum flexibility, especially if you’re building a custom fireplace unit. Its slim profile and zero-clearance approval mean it can be recessed into a wall or paired with a cabinet mantel, offering a clean, built-in look. The unique airflow system aims to improve heat flow, and it’s compatible with most 18″ to 30″ ventless gas log sets, giving you control over the final aesthetic.

While it boasts easy installation and American assembly, remember that logs are sold separately, so factor that into your budget. It’s a great foundation for a personalized fireplace project, ideal for those who want to integrate a ventless system seamlessly into their home’s design. If you’re looking for a versatile base for your ventless gas logs, this is a strong contender.

The Flint Hill 18″ gas log set offers a straightforward way to add warmth and ambiance to your existing fireplace, specifically designed for propane (LP) fuel. Its vent-free operation means all the heat stays in your room, making it an efficient supplemental heating source that works even during power outages. The set includes hand-painted logs and glowing embers for a realistic fire illusion, controlled manually for simplicity.

It requires a minimum firebox size (17″ H x 28″ W x 12″ D) and is not recommended for bedrooms due to its vent-free nature. If you’re looking for a simple, reliable propane solution without complex controls or venting, this set provides a cozy atmosphere efficiently. It’s a practical choice for those who already have propane and want an easy-to-use fire feature.