Hotstart-Data-Sheet-CTM-Engine-Heater-EN.pdf

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This is a product datasheet for the Hotstart CTM HOTflow® Heating System, a coolant preheater designed for diesel and gas engines in stationary land power, marine, and construction equipment applications.

The CTM is a compact, single-phase forced circulation heating system capable of heating engines up to 20 liters in displacement. Key specifications include: dimensions of 9.1" H × 5.7" W1 × 6.3" W2, weighing 3.5 lbs; IP44 ingress rating; operating temperature range of -40°F to 104°F; and available heat power outputs of 1 kW, 1.5 kW, or 2.5 kW. The system operates on 120V or 240V at 60 Hz, with 240V options available at 50 Hz. Coolant flow rate is 3.5 gallons per minute at 4 psi, with fixed temperature control set at 100–120°F and a high-limit temperature of 300°F. The system uses a 50/50 water-glycol coolant mix and features 0.625-inch hose barb inlet/outlet connections. Available certifications include UL/C-US listed models and CE-compliant models. The datasheet provides 18 model numbers organized by engine displacement (0–500 CID, 500–750 CID, 750–1200 CID), power supply voltage and frequency, and cord configuration options (8-foot NEMA plug, 9.8-foot Euro plug, or 9.8-foot no plug). An optional vibration isolation kit (CTM IMK) is available for mobile applications. The product offers up to 35% reduction in end-user utility costs through efficient forced circulation and uniform engine heating.

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COMPACT CAPABILITY

Despite its small footprint, efficient forced circulation allows the CTM to heat engines up to 20 liters in displacement, allowing for a wide variety of small-engine applications.

EASY INSTALLATION

The CTM’s inlet and outlet may be reoriented at 90° increments to accommodate heater plumbing. The included mounting kit is ideal for most installations; an optional vibration isolation kit is also available.

VERSATILE & ADAPTABLE

The CTM can be configured for almost any weather-protected application. Multiple options are available, including UL/C-US listed and CE-compliant models.

LOWER TOTAL COST OF OWNERSHIP

Forced circulation provides uniform heat throughout the engine, reducing component maintenance and offering significant energy savings. The CTM may reduce end-user utility costs by up to 35%1.

1 Savings are dependent on local utility rates and installation variables.

sales@hotstart.com © 2025 Hotstart

DS-CTM-E

2025-10/rev10 hotstart.com

HOTflow®Heating System

CTM

Hotstart’s CTM HOTflow® heating system is a coolant preheater, developed to maintain optimal temperatures for diesel and gas engines in stationary land power, marine, and construction equipment applications.

Height (H) Width 1 (W1) Width 2 (W2) Weight

9.1” 5.7” 6.3” 3.5 lbs

230 mm 145 mm 161 mm 1.6 kg

System

Phase single-phase (1 Ø)

Voltage (60 Hz) 120 V 240 V

Voltage (50 Hz) 240 V

Ingress IP44

Min./Max. Ambient Temp -40 °F / 104 °F (-40 °C /40 °C)

Application for use in weather protected applications

Certification UL/C-US recognized models available (E250789) CE-compliant models available

Coolant

Fluid Type Water Coolant mix (50% water/50% glycol)

Heat Power 1 kW 1.5 kW 2.5 kW

Temp. Control Fixed, 100 – 120 °F (38 – 49°C)

Temp. High Limit 300 °F (149°C)

Flow 3.5 gpm @ 4 psi (13.3 L/min @ 28 kPa)

Inlet/Outlet 0.625” (16 mm) hose barb

Vibration Isolation Kit

CTM IMK

Optional kit protects heating system from damaging engine vibration. For use in mobile applications or non-isolated stationary skid installations.

Ordering Information

CTM

CTM with 8’ (2.4 m) cord and NEMA plug* (-N00)

Engine Displacement

Power Supply Heating System

V Hz kW Amps Model Number

0 – 500 CID

0 – 8 L

120 60 1 8.8 CTM10110-N00

240 50/60 1 4.4 CTM10210-N00

500 – 750 CID

8 – 12 L

120 60 1.5 13.0 CTM15110-N00

240 50/60 1.5 6.5 CTM15210-N00

750 – 1200 CID

12 – 20 L

120 60 2.5 21.3 CTM25110-N00

240 50/60 2.5 10.7 CTM25210-N00

CTM with 9.8’ (3 m) cord and Euro plug** (-E00)

Engine Displacement

Power Supply Heating System

V Hz kW Amps Model Number

0 – 500 CID

0 – 8 L

120 60 1 8.8 CTM10110-E00

240 50/60 1 4.4 CTM10210-E00

500 – 750 CID

8 – 12 L

120 60 1.5 13.0 CTM15110-E00

240 50/60 1.5 6.5 CTM15210-E00

750 – 1200 CID

12 – 20 L

120 60 2.5 21.3 CTM25110-E00

240 50/60 2.5 10.7 CTM25210-E00

CTM with 9.8’ (3 m) cord and no plug (-A00)

Engine Displacement

Power Supply Heating System

V Hz kW Amps Model Number

0 – 500 CID

0 – 8 L

120 60 1 8.8 CTM10110-A00

240 50/60 1 4.4 CTM10210-A00

500 – 750 CID

8 – 12 L

120 60 1.5 13.0 CTM15110-A00

240 50/60 1.5 6.5 CTM15210-A00

750 – 1200 CID

12 – 20 L

120 60 2.5 21.3 CTM25110-A00

240 50/60 2.5 10.7 CTM25210-A00

* – UL/C-US listed ** – CE compliant

Other voltages available.

Consult the factory.

H

W1

W2

HOTflow®Heating System

CTM

sales@hotstart.com © 2025 Hotstart

DS-CTM-E

2025-10/rev10 hotstart.com

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