Best Torpedo Heater Duct Options and Compatible Heaters

Choosing the right torpedo heater duct or compatible heater affects airflow, safety, and installation flexibility. Below is a quick comparison of the five selected products, followed by detailed product sections and a buying guide to help match ducting and heater choices to your space and application.

Product	Type	Key Feature
Mr. Heater 80,000 BTU Forced Air Kerosene Heater	Torpedo Heater	Multi-fuel, Built-in thermostat, LED diagnostics
ProTemp 140,000 BTU Kerosene/Diesel Forced Air Torpedo Heater	Torpedo Heater	High airflow up to rated CFM, corrosion resistant guards
75mm Diesel Parking Heater Set — ZDHQLHJ	Duct / Exhaust Pipe	75mm diameter, stretchable up to 100cm, high-temp aluminum
Towallmark 125,000 BTU Forced Air Diesel Heater	Torpedo Heater	Large tank, multi-fuel, long run time
Warm Air Vent Outlet 42mm — Xximuim	Warm Air Outlet / Vent	360° rotatable, compact vent for ducted warm air

Mr. Heater 80,000 BTU Forced Air Kerosene Heater Black

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This torpedo-style forced air heater is designed to operate on several liquid fuels, making it compatible with common jobsite fuel supplies. It delivers 80,000 BTUs, suitable for heating medium-sized workshops or for use as a supplemental heat source when paired with short duct runs or directional outlets.

Key listed features: multi-fuel capability (kerosene, filtered diesel #1/#2, fuel oil #1/#2, jet A), 80,000 BTU output, and a built-in thermostat with LED diagnostics. The built-in thermostat aids temperature control when connecting to a fixed duct or outlet. When selecting ducting, match the heater’s airflow direction and avoid overly long flexible ducts that reduce effective CFM.

ProTemp 140,000 BTU Kerosene/Diesel Forced Air Torpedo Heater

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The ProTemp PT-140T-KFA emphasizes airflow performance, which matters when pairing with ducts. Its matched direct drive motors and blades deliver high airflow and efficient heat distribution. The unit is built with powder-coated steel guards for durability in jobsite environments.

Features include high achievable airflow (rated up to its CFM capabilities), energy-efficient design, and corrosion-resistant construction. For ducting, prioritize rigid or short-length flexible duct rated for high temperature to preserve airflow and avoid heat losses. The ProTemp’s robust airflow helps offset small losses through moderate duct lengths.

75mm Diesel Parking Heater Set, ZDHQLHJ Diesel Heater Exhaust Pipe Ducting

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This product is a dedicated exhaust and outlet duct intended for diesel parking heaters like Webasto and Eberspacher. It has an inner diameter of 75mm and is made from high-temperature aluminum foil material that resists corrosion and heat.

Key features: suitability for 2KW, 5KW, and 8KW diesel air heaters, 75mm diameter, and a stretchable length of ~50cm extended to ~100cm. This style of duct is designed for compact routing of exhaust or warm-air outlets in vehicles, boats, or small enclosures. Verify inlet/outlet diameter compatibility and heat rating before installation, and ensure exhaust routing follows local safety guidelines for combustion products.

Towallmark 125,000 BTU Forced Air Diesel Heater & Kerosene Heater

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Towallmark’s torpedo heater offers 125,000 BTUs and multi-fuel capability. It also has a relatively large fuel tank and claims extended runtime per fill, which matters when planning long heating sessions that feed air through ducts or multiple outlets.

Highlighted features: high-output heat for larger spaces, multiple fuel options, and a 26L tank capacity for extended operation. When ducting this unit, consider tank placement and ventilation for safe fuel handling. The heater’s higher output can supply more distant duct runs, but duct length, bends, and material will still impact delivered temperature and airflow.

Warm Air Vent Outlet, 2pcs 360° Rotatable Car Heater Duct Hose Pipe Warm Air Vent Outlet (42mm)

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This pair of 42mm rotatable warm air outlets is intended for directing warm air from parking heaters or compact ducts into cabins, consoles, or small compartments. The plastic construction offers corrosion resistance and allows steering of the warm air plume.

Features include 360° rotation, durable plastic material, and small-form vent design suitable for Eberspacher, Webasto, and Propex style systems. Use these outlets where precision direction of warm air is needed and pair them with flexible ducting or fixed pipes sized to the 42mm outlet to minimize leaks and maintain airflow.

Buying Guide: Choosing Torpedo Heater Ducts And Compatible Heaters

Selecting the right combination of torpedo heater and ducting requires balancing heat output, airflow, and duct compatibility. Below are the core considerations and comparison perspectives to help guide purchases.

1. Match Duct Diameter To Heater Outlet

Ensure the duct or outlet diameter corresponds to the heater’s air discharge. Diameter mismatches cause turbulence, pressure drop, and reduced delivered heat. For small parking heaters, 42mm–75mm outlets are common. For larger torpedo heaters, use larger ducts or short flexible runs sized for the unit’s outlet.

2. Consider Temperature Ratings And Materials

Ducts carry hot air and sometimes exhaust. Use materials rated for sustained temperatures: aluminum foil-lined hoses for exhaust routing, and heat-rated flexible ducts for warm air delivery. Avoid low-temp plastics for sections exposed to high-heat streams.

3. Keep Duct Runs Short And Minimize Bends

Airflow and temperature drop with longer runs and multiple bends. Design duct routing with minimal length and gentle curves. If long runs are unavoidable, select heaters with higher airflow or larger BTU output to compensate for losses.

4. Airflow (CFM) Versus BTU Output

BTUs indicate energy output; CFM indicates how much air the heater moves. For ducted systems, a higher CFM often delivers heat more effectively through ducts than a high BTU/low CFM unit. Compare manufacturer CFM ratings when ducting is planned.

5. Fuel Type And Venting Requirements

Multi-fuel torpedo heaters offer versatility, but each fuel has specific combustion and exhaust characteristics. For combustion heaters, ensure proper exhaust routing and ventilation. For warm-air-only systems, use ducts that do not carry combustion gases unless specifically designed for exhaust.

6. Mounting, Portability, And Tank Capacity

Consider where the heater and tank will sit relative to duct entry points. Integrated tanks increase portability but may limit placement. Permanently mounted heaters or dedicated parking heaters often require tailored ducting kits with precise diameters and secure attachment points.

7. Outlet Controls And Directional Vents

Directed vents (like 360° rotatable outlets) help aim warm air where needed. For multi-zone applications, combine one high-CFM heater with distribution vents and dampers to balance heat between spaces.

8. Durability And Jobsite Conditions

On construction sites, choose guards, duct materials, and vent hardware that resist corrosion, abrasion, and moisture. Powder-coated guards and reinforced ducting offer longer service life in harsh environments.

9. Safety And Compliance

Follow manufacturer recommendations for clearances, exhaust routing, and combustible materials. Use exhaust ducting only where rated for combustion gases. Confirm equipment meets applicable safety standards and local codes for ventilation and fuel use.

10. Installation And Accessories

Plan for clamps, gaskets, and mounting brackets to ensure airtight connections and secure routing. For vehicle or boat installations, use specialized exhaust kits and weatherproof outlets. For workshop setups, consider short rigid duct and insulated flexible sections where needed.

Comparison Perspectives To Evaluate

• Small Vehicle/Boat Parking Heaters: Prioritize correct diameter exhaust/outlet ducts like the 75mm kit and 42mm rotatable vents for directed cabin warm air.
• Jobsite/Workshop Ducting: Focus on units with higher CFM and short rigid or minimal flexible duct runs to maintain heat delivery.
• Large Space Heating: Prefer higher BTU units with sufficient airflow or multiple distribution points; verify ducting can handle volume and heat.
• Portability Needs: Consider integrated-tank torpedo heaters for mobile jobs but plan duct routing with quick-disconnect fittings.
• Durability Priority: Choose corrosion-resistant guards and metal ducting for frequent outdoor or heavy-duty use.

Use the guide above to align duct diameter, material, and heater selection with your intended application, safety needs, and expected runtime. Proper matching of heater output, airflow, and ducting is the key to efficient, safe warm-air delivery.