Refrigerated Trailers
Heat King
NewThe highest capacity transport heater for maximum uptime and reliability.
The Heat King is the highest capacity transport heater available, delivering maximum uptime, ease of maintenance, and long-term reliability with its rugged design.

Heat King® Cargo Trailer Heating Unit
The Heat King 450 MAX utilizes an exhaust heat exchanger that extracts even more heat from the engine, allowing the unit to become 70% efficient in the transfer of energy from diesel fuel to heat. This design produces 33% more heat capacity and transfers heat more efficiently than the closest competitor product.
Benefits
Maximum Output & Performance
The Heat King 450 MAX utilizes an exhaust heat exchanger that extracts even more heat from the engine, allowing the unit to become 70% efficient in the transfer of energy from diesel fuel to heat. This design produces 33% more heat capacity and transfers heat more efficiently than the closest competitor product. It offers extra capacity for longer thin-walled trailers, powerful airflow, is DOT-approved for transport of flammable liquids and gases, and has high and low speeds for optimal fuel economy. It is also EPA Tier IV compliant.
Integrated TracKing® Telematics
With ConnectedSuite™ telematics, you have the data you need to help keep deliveries on time and avoid load loss. Every Heat King unit comes factory-equipped with TracKing telematics and 24 months of no-cost service. Telematics offers real-time asset connectivity, compliance and security, data sharing, and extensive reports.
Solar Benefits
A ThermoLite® 40W solar panel comes standard on all Heat King models to offer increased battery life, fuel savings, extended component life, improved employee efficiency, and optimized telematics.
ThermoGuard® VII Controller
The integrated cycle-sentry feature ensures optimal fuel economy and the battery voltage monitor ensures that the batteries are charged. Operational data and alarm codes are automatically logged and downloadable via USB. It features flash loadable programming and diagnostics through PC monitor USB interface, an optional status light, and a compact design for mounting directly to or recessed into the trailer. Includes on/off switch, hour meter and display. Alarm codes are easily accessed through the TGVII display and PC monitor USB interface.
Unit Specs
Heating Capacity (Heat King 450 MAX)
| HIGH BTU/Hr | 50,000 |
| HIGH Watts | 14,650 |
| HIGH RPM | 3,200 |
| LOW BTU/Hr | 10,000 |
| LOW Watts | 2,930 |
| LOW RPM | 1,550 |
Heating Capacity (Heat King 450 HO)
| HIGH BTU/Hr | 36,000 |
| HIGH Watts | 10,500 |
| HIGH RPM | 3,050 |
| LOW BTU/Hr | 10,000 |
| LOW Watts | 2,930 |
| LOW RPM | 1,550 |
Airflow (Heat King 450 MAX)
| HIGH CFM | 3,600 |
| HIGH M³/hr | 5,925 |
| LOW CFM | 1,700 |
| LOW M³/hr | 2,800 |
Airflow (Heat King 450 HO)
| HIGH CFM | 3,400 |
| HIGH M³/hr | 5,600 |
| LOW CFM | 1,700 |
| LOW M³/hr | 2,800 |
Weight (approximate with battery)
| Heat King 450 MAX | 488 lbs (221 kg) |
| Heat King 450 HO | 448 lbs (203 kg) |
Fuel Tank Weight (with brackets, without fuel)
| 30 Gallon | 90 lbs (41 kg) |
| 50 Gallon | 100 lbs (45 kg) |
| 110 Gallon | 308 lbs (140 kg) |
Operation
| Heating | Automatic cycle-sentry heating for freeze protection |
Request a Quote
Tell us what you're looking for and a local Sonsray representative will reach out to you promptly with pricing and availability.
- No obligation — just honest answers from equipment experts.
- Fast response from your nearest Sonsray location.
- Factory pricing, financing options, and trade-in evaluation available.
- We carry new, used, and demo equipment across all brands.
Prefer to Talk?