On-Highway Trucking

Cold Start, Idle Management, On-board Heating Solutions

Dependable cold weather heating systems to protect your truck and keep your wheels rolling.


Thermex Engineering Systems is a custom design-build supplier of Fluid and Fuel Warming Systems, Idle Reduction SystemsFreeze Protection Systems and Specialty Equipment for On-Highway truck fleets and Semi Truck cold weather management systems.


Maintaining your trucking fleet can be a real challenge when cold weather sets in. Diesel fuel can be subject to gelling in freezing temperatures, batteries lose voltage, systems lock up, resulting in a vehicle that must be idled constantly in order to compensate. The loss of fuel from constant idling and the additional damage freezing temperatures can bring, means a loss of revenue to your business.


Thermex systems offers modular, extensible options for on-highway trucks, keeping fuel costs down, while utilizing existing engine and coolant heat to warm other systems, maintaining consistent temperatures. Our design-build component systems can be customized to your specific needs and situation.

On-Highway Trucking Industry - DEF Fuel Tanks

On-Highway Trucking – Components

Heat Probe - Fluid & Fuel Warming System


Multiple immersion tank heaters utilize hot coolant to keep bulk fluids warm (typically installed vertically).

Engine Coolant Manifold System

Coolant Manifold

Simplifies plumbing when using multiple heat exchangers.

Tundra Therm On-board Engine Coolant Heater


12V diesel fired coolant heater available with optional 120VAC shore power hook-up.

Quick Coupler Manifold

Quick Coupler Manifold

Provides hook-up connections for the PortaThaw® Cold Start System to rapidly heat up engine coolant

Battery Warmer From Engine Coolant Lines


Utilizes hot coolant to prolong battery life and helps maintain consistent voltage / amperage.

Fuel Line Heater - Fuel Warming System

Fuel Line Heater

In line heater utilizes hot coolant to keep the diesel fuel from gelling / waxing.

Therma Start - Idle Reduction Idle Management Start Stop System


Electronic monitoring system that eliminates unnecessary idling, saves fuel, prolongs oil change intervals and saves on maintenance costs.

Engine Coolant Heater Booster Pump

Booster Pump

Used to reduce the possibility of pressure drop in heating loops where multiple heat exchangers are used, or when there are long distances between heating lines.

Click to see these components in action on our Semi Truck example:

Semi Truck - On Highway Trucking Diagram