909493_Thermo 230/300/350

Thermo 230 / 300 / 350 Coolant Heaters

Be Ready For Work Webasto coolant heaters are designed to perform in the most demanding weather conditions. They offer the ideal solution for engine pre-heat, operator comfort and increased productivity. When combined with hydraulic fluid warmers they can also be used to heat fuel and hydraulic fluids.

Coolant Heater Features: n Provides engine pre-heat and interior cab heat n Full diagnostics with PC interface available n Eliminates cold starts n Heats hydraulic fluid with optional accessories

Technical Specifications

Thermo 230

Thermo 300

Thermo 350

Heating Capacity

85,000 BTU/h (25 kW)

102,000 BTU/h (30 kW)

120,000 BTU/h (35 kW)


Diesel #1, Biodiesel B20

Fuel Consumption

0.8 gal/h (3.0 l/h)

1.2 gal/h (4.5 l/h)

1.35 gal/h (5.1 l/h)

Rated Voltage

24 V

24 V

24 V

Power Consumption

2.7 Amps (65 W)

4.6 Amps (110 W)

5.8 Amps (140 W)

Dimensions (L x W x H)

24 x 9.75 x 8.675 in (610 x 246 x 220 mm)


42 lbs (19 kg) / 103 lbs (46.7 kg) with enclosure

Thermo Series Coolant Heater Kit Part Numbers:  Thermo 300 Heater Enclosure Box Kit (with standard U4814 circulation pump) - Part Number 923357A

 Thermo 300 Heater Enclosure Box Kit (with heavy duty U4855 brushless motor circulation pump) - Part Number 5000102B  Thermo 300 Heater Enclosure Box Kit (with heavy duty U4855 brushless motor circulation pump)* - Part Number 5000134A  Thermo 350 Enclosure Box Heater Kit (with standard U4814 circulation pump) - Part Number 5001406A * For Detroit Diesel S4000 engine only

Thermo Series Coolant (Heater Only) Part Numbers:  Thermo 230 Heater (Heater only) - Part Number 63647B  Thermo 300 Heater (Heater only) - Part Number 63650B  Thermo 350 Heater (Heater only) - Part Number 9012660A

SmarTemp Control fx Timer 2.0 (optional) for Thermo Series - Part Number 5010633C

Standard Kit Components:: n Thermo Series Heater n Integrated Control Unit n Fuel Filter n Weather Protective Heater Enclosure n Magnetic Drive Coolant Pump n Operation/Installation Manual n 2 Year/2000 Hour Limited Warranty

• Programmable runtimes • Ergonomic design • Large backlit LCD screen • 12 or 24 Volt operation

Optional Controller: On/Off Toggle Switch for Thermo Series - Part Number: 905104

Accessories for Compact and Enclosure Kits: Universal Wiring Harness - Part Number: 5010736A Electrical Connector Kit (for custom harnesses) - Part Number: 906942

Fuel Standpipe - Part Number: 903210A Flexible Stainless Exhaust Tubing (70 mm) -

1 foot Part Number: 5000287A 2 feet - Part Number: 5000329A

Webasto Thermo & Comfort North America, Inc. 15083 North Road Fenton, Michigan 48430 USA Toll Free: 800-860-7866 Phone: 810-593-6000 webasto.com

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