5010666B – Webasto Thermo Pro 50 Standard Kit 24V Diesel Coolant Heater

Cold starts increase engine wear, fuel consumption, and emissions—especially in off-highway and specialty equipment. The Webasto Thermo Pro 50 addresses these challenges by pre-warming the engine coolant before startup.

This 24-volt diesel coolant heater delivers up to 17,000 BTU/hr of auxiliary heating power. Because it heats the coolant directly, the Thermo Pro 50 helps eliminate cold starts, supports easier engine starting, and improves overall engine life.

The heater’s compact dimensions and lightweight design allow installation in vehicles and equipment with limited space. In addition, its design supports multiple installation configurations, including remote-mounted coolant pumps and rotatable coolant inlet and outlet ports, improving flexibility in tight or complex engine compartments.

Designed specifically for specialty commercial and off-highway applications, the Thermo Pro 50 is tested for reliable operation in extreme cold and supports significant fuel savings through reduced idling.

Key Features & Benefits

• Provides up to 17,000 BTU/hr of auxiliary diesel coolant heating

• Helps eliminate cold starts and reduce engine wear

• Reduces harmful emissions through efficient engine preheating

• Compact and lightweight for installations with limited space

• Tested for operation down to -50°F (-46°C)

• Automatic high-altitude adjustment up to 11,000 ft (3,350 m)

• Rotatable coolant inlet and outlet ports (180°) for installation flexibility

• Designed for specialty commercial and off-highway equipment

What’s Included

This standard kit includes:

• Thermo Pro 50 coolant heater

• DP42 fuel pump

• Wiring harness

• Fuel standpipe and fuel line

• Exhaust tube

• Air intake muffler

• Stainless-steel heater mounting bracket

• Installation materials

• Toggle switch

Technical Specifications

Heater Model: Thermo Pro 50
Part Number: 5010666B
Voltage: 24V
Fuel Type: Diesel
Heating Medium: Engine coolant (hydronic)
Maximum Heat Output: Up to 17,000 BTU/hr
Operating Temperature Capability: Tested to -50°F (-46°C)
Maximum Operating Altitude: Automatic adjustment up to 11,000 ft (3,350 m)
Coolant Connections: Inlet and outlet ports rotatable 180°
Coolant Pump Configuration: Remote mounted

Applications

• Specialty commercial vehicles

• Off-highway equipment

• Construction equipment

• Agricultural equipment

• Utility and service vehicles

• Equipment operating in extreme cold environments

Installation Notes

• Designed for 24V diesel systems only

• Installs into the engine coolant loop

• Compact size supports multiple mounting configurations

• Professional installation is recommended