Part No.

14257

14278

320HTR4

320HTR4T

Heater(s)

Electric

Electric

Coolant

Coolant

Watts

500W

300W

N/A

N/A

Voltage

12V

12V

N/A

N/A

Internal Thermostat

In-Cab Control

Yes

No

Yes

Horsepower Rating (1)

200 - 300 hp

Up to 200 hp

Up to 300 hp

Up to 300 hp

Nominal Current Draw

35.7

21.4

N/A

N/A

Min. Alt. Rating (2)

75

65

N/A

N/A

5 Min. Preheat Amp Hrs. (3)

3.0

1.0

N/A

N/A

Notes:

(1) Use specifications for horsepower ratings as general guideline only.
(2) For on-highway trucks, this assumes concurrent use of high-beam headlamps, tractor lights, heater blower and minimum trailer lighting. Use of many electrical accessories will increase the necessary alternator rating.
(3) Amp hour draw for 5 minutes preheat. Most 12V heavy-duty batteries are rated at approximately 80 amp hours.

Part No.

30012V

30024V

50012V

50024V

Heater(s)

Electric

Electric

Electric

Electric

Watts

300W

300W

500W

500W

Voltage

12V

24V

12V

24V

Internal Thermostat

In-Cab Control

In-Cab Control

In-Cab Control

In-Cab Control

Horsepower Rating (1)

100 - 200 hp

100 - 200 hp

Over 200 hp

Over 200 hp

Nominal Current Draw

21.4

10.7

35.7

17.9

Min. Alt. Rating (2)

65

40

75

45

5 Min. Preheat Amp Hrs. (3)

1.8

0.9

3.0

1.5

Length

8’ (2.44M)

8’ (2.44M)

12’ (3.66M)

12’ (3.66M)

Notes:

(1) Use specifications for horsepower ratings as general guideline only.
(2) For on-highway trucks, this assumes concurrent use of high-beam headlamps, tractor lights, heater blower and minimum trailer lighting. Use of many electrical accessories will increase the necessary alternator rating.
(3) Amp hour draw for 5 minutes preheat. Most 12V heavy-duty batteries are rated at approximately 80 amp hours.