7 Best Tube Heaters 2025 in the United States

This 400-watt marine bilge heater from Xtreme Heaters is designed to protect boat engine compartments and similar spaces like RV underbellies, campers, and greenhouses from freezing. Its compact size has improved by 10% while boosting power by 150 watts compared to earlier models, making it a solid choice if you're looking for a powerful yet space-saving heater. It operates between 40°F and 55°F, using a self-regulating PTC element that automatically turns on and off to maintain consistent temperatures, which helps avoid overheating and saves energy.

The heater is built tough, with an anodized case and sealed electronics to withstand moisture, vibration, and cold – important for harsh outdoor and marine conditions. It also includes a waterproof fan to boost heat circulation and can be mounted in any direction, including upside down, offering flexible installation options. Safety is a strong point here, meeting various marine and military certification standards, plus it has an LED indicator for easy temperature monitoring.

Its heating coverage of about 40-60 square feet is best suited for smaller compartments rather than large spaces. The heater plugs into a standard 110V outlet and weighs only 4 pounds, making it easy to install and move if needed. This heater provides reliable freeze protection with useful safety and efficiency features, making it ideal for boat owners and campers who need dependable warmth in confined or exposed areas, though it might be less effective for bigger rooms or open outdoor spaces.

The Modine Hot Dawg Gas Fired Unit Heater (Propane 75000 BTU) is a robust option for heating indoor areas like garages. With a power output of 75,000 BTU, it is capable of warming large spaces efficiently. The unit is designed in a cabinet form factor and mounts using a ceiling bracket, which can save floor space and position the heat source optimally for better circulation.

However, it is relatively heavy at 181 pounds, which might make installation challenging without assistance. It's specifically intended for indoor use, making it a good fit for enclosed areas like garages or workshops. The heater operates on propane and boasts an 80% efficiency rating, indicating that it converts most of its fuel into useful heat. This efficiency is decent but not the highest available on the market.

Temperature control options are not explicitly mentioned, which could be a drawback for those needing precise heating settings. Safety-wise, being power vented adds a layer of protection against gas buildup, but there are no specific safety features highlighted in the description. Potential buyers should consider the installation requirements and possible limitations in temperature control.

The SunStar Natural Gas Heater Infrared Tube with a power output of 175,000 BTU is designed to provide significant heating coverage, making it a robust option for large spaces. At 40 feet in length, it’s suited for wide areas such as warehouses or large garages. The weight of the unit, at 198 pounds, indicates a solid and durable build, though it may require professional installation due to its size and weight.

The radiant burner type is ideal for efficient and effective heating as it emits infrared heat, warming objects directly rather than just the air, which can be more energy-efficient over time. This heater is best suited for users with large spaces needing powerful heating solutions and who may have the resources to handle installation.