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In-Block Heaters

Hotstart In-Block heaters mount directly into the water jack and can reduce wear up to 50%.

HOTSTART's line of In-Block heaters mount directly into the water jacket of the engine and can reduce engine wear due to cold starts by up to 50%. Warming the engine to the proper temperature also reduces idling and cranking time, saving fuel and minimizing maintenance. HOTSTART preheaters are available for most leading makes and models of heavy-duty truck engines and are CSA approved.

To specify an in-block heater for your heavy-duty engine, please select your engine manufacturer and model in the drop-down below.


Not intended for hazardous locations.

Heating Information

Primary Heating

  • Coolant Mix

Primary Heat Power

  • 300 W
  • 400 W
  • 530 W
  • 750 W
  • 1 kW
  • 1.25 kW
  • 1.5 kW

Power Specifications

Power Sources

  • AC, Single-Phase, 50/60 Hz


  • 120
  • 240

Power Connectors

  • NEMA Plug
  • No Cord

Temperature Control

Primary Temperature Control

  • N/A

Mount Types

  • See In-Block Heater Search


  • CSA

Related Products

Thermocords complete the In-block heater assembly by providing a power cord and plug for the engine.

HOTSTART In-block Thermocords complete the in-block heater assembly, providing a power cord and plug for use with the installed engine block heater. Cords are available with or without thermostats and…

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