Eberspacher ThermoLine 24V Diesel Fuel Pre-Heater

Eberspächer ThermoLine 24V Diesel Fuel Line Heater - 300 W

The Eberspächer ThermoLine 24V Diesel Fuel Line Heater is a genuine inline diesel fuel heater designed to help prevent diesel waxing, clogged fuel filters, and restricted fuel flow in freezing conditions. This listing is for the 300 W ThermoLine version, part number 292150000006, for 24V diesel vehicles and equipment.

In cold weather, diesel fuel can form paraffin crystals that collect in the primary fuel filter and restrict fuel flow. ThermoLine is installed in the diesel fuel line before the primary filter, where it helps warm the fuel before it reaches the filter. This helps reduce the risk of winter starting problems, loss of engine power, and cold-weather downtime.

ThermoLine uses a reinforced rubber fuel hose with an internal self-regulating heating strip. As temperatures drop, the heating output increases. As temperatures rise, output automatically reduces. This self-regulating design helps provide reliable diesel fuel heating without a thermostat, bimetal switch, or moving parts.

Part Numbers

• 292150000006
• 29.2150.00.0006
• 29.2150.00.00.06
• 29 2150 00 0006

Key Features

• Genuine Eberspächer ThermoLine diesel fuel line heater
• 300 W heating output for 24V diesel systems
• Inline diesel fuel heater design for installation before the primary fuel filter
• Helps prevent diesel waxing in low temperatures
• Helps reduce diesel fuel filter blockage caused by paraffin crystals
• Supports more reliable cold-weather diesel fuel flow
• Self-regulating internal heating strip automatically adjusts output
• No thermostat, no bimetal switch, and no moving parts
• Reinforced rubber hose construction for vehicle and equipment use
• Suitable as a diesel fuel heater for trucks, buses, fleet vehicles, specialty vehicles, and heavy-duty equipment

Product Details

• Brand: Eberspächer
• Product family: ThermoLine
• Product type: Diesel fuel line heater / inline diesel fuel heater
• ThermoLine type: TLN-024-300
• Operating voltage: 24V
• Heating output: 300 W
• Approximate length: 48.8 in.
• Recommended fuel flow rate: 18.5 to 31.7 gal/hr
• Fuel hose connection: 10 mm nominal diameter, roughly equivalent to 3/8 in.
• Hose nominal diameter: 13 mm, roughly equivalent to 1/2 in.
• Recommended minimum generator output: 30 A
• Recommended relay: 20 A
• Fuse ratings: 8 A and 25 A

Ideal Applications

This 300 W diesel fuel heater is ideal for 24V diesel vehicles and equipment that operate in freezing temperatures. It is a strong fit for commercial trucks, buses, transport vehicles, construction machinery, utility vehicles, fleet vehicles, specialty vehicles, and other diesel-powered equipment where fuel waxing can cause winter reliability issues.

For truck and fleet applications, ThermoLine helps protect fuel flow before the primary filter, making it useful for cold-weather routes, long outdoor parking periods, winter job sites, and diesel equipment that must remain ready in low temperatures.

How This Diesel Fuel Heater Helps in Cold Weather

Diesel fuel can become harder to move through the fuel system when temperatures drop. Paraffin crystals can form in the fuel and collect in the filter, making it harder for fuel to reach the engine. By heating the diesel fuel before it reaches the primary filter, ThermoLine helps support more reliable fuel flow in winter operating conditions.

Installation Note

ThermoLine should be installed in the diesel fuel line between the fuel tank and the primary fuel filter, with the heating head positioned as close to the filter as practical. Installation should be completed according to Eberspächer instructions by a qualified technician familiar with diesel fuel systems and 24V vehicle electrical systems.

Note: U.S. measurements are rounded conversions from manufacturer documentation for easier customer reference. Metric hose sizes are retained because this is a European fuel system component, and the inch values are approximate equivalents rather than SAE hose specifications.