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CSM HOTflow® Engine Heater


The HOTflow® CSM engine heater features the most powerful pump (10 gpm flow) and most powerful heating element options (up to 12 kW) in the HOTflow® lineup. The CSM's heating power, combined with it's energy efficient design, makes it ideal as a replacement for costly convection-based heaters in large-engine installations up to 100 L displacement.

The CSM lineup is equipped to meet a wide array of conditions, including power source requirements and agency certifications. Whatever your power or heating needs, there's a CSM to meet your specific heating system application. The integrated control box allows for easy power connections and enables automatic heater operation, eliminating the need for additional customer-supplied control components.

Power and pump-driven forced circulation provides superior heat distribution, making the CSM a viable option to replace paired or multiple convection-based heaters – improving heating performance while reducing maintenance costs.

Not intended for hazardous locations.

Heating Information

Primary Heating

  • Water
  • Coolant Mix

Primary Heat Power

  • 3 kW
  • 6 kW
  • 9 kW
  • 10.5 kW
  • 12 kW

Power Specifications

Power Sources

  • AC, Single-Phase, 60 Hz
  • AC, Single-Phase, 50 Hz
  • AC, Three-Phase, 60 Hz
  • AC, Three-Phase, 50 Hz


  • 120
  • 208
  • 230
  • 240
  • 440
  • 400
  • 480
  • 575

Power Connectors

  • Hardwired

Temperature Control

Primary Temperature Control

  • 100–120 °F (38–49 °C)

Mount Types

  • Foot

Inlets / Outlets


  • 1” NPT


  • 1” NPT

Ingress Options

Control Box Ingress

  • NEMA 4
  • IP66

Coolant Motor Ingress

  • NEMA 2
  • IP44


  • UL-C / US listed
  • CE-compliant models available

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