Thermo King Precedent and Heat King
Trailer units
A complete lineup of cooling and heating solutions for trailers that offers more choices, greater efficiency and precise temperature control.
Seven Precedent units.
Single-temperature for one load, multi-temperature to haul fresh and frozen together, and Heat King for freeze protection.
S-60050-stateDouble-digit fuel savings and Thermo King reliability and performance. Its evergreen CARB compliant engine makes it a 50-state solution.60,000 BTU/hr at 35°FExplore the S-600
S-70050-stateFor single-temperature trailers requiring deep-frozen capability. CARB Evergreen certified and customizable for your business.68,000 BTU/hr at 35°FExplore the S-700
C-60049-stateFor businesses that don't operate in California, a cost-effective way to take advantage of the benefits of the Precedent line.59,000 BTU/hr at 35°FExplore the C-600
S-750i50-stateA hybrid-electric architecture with integrated shore power, for powerful performance on and off the road.68,000 BTU/hr at 35°FExplore the S-750i
S-610M50-stateMulti-temp, optimized for food distribution, with CARB Evergreen certification so no DPF will ever be required.57,500 BTU/hr at 35°FExplore the S-610M
S-610DE50-stateTwo separate temperature zones in one trailer without the need for remote evaporators. CARB Evergreen, so no DPF will ever be required.58,000 BTU/hr at 35°FExplore the S-610DE
C-600M49-stateThe benefits of Precedent in a cost-effective, multi-temp package, for businesses that do not need a CARB Evergreen unit.52,000 BTU/hr at 35°FExplore the C-600M
Heat King 450
With 50,000 BTUs, the Heat King is the highest capacity transport heater available in the market today. It now comes standard with 24 months of TracKing telematics and solar.
Explore the Heat King 450Spec sheet, TK 57335-6-PL (PDF, opens in a new tab)Which Precedent?
Answer two or three questions for the trailer you run most.
These questions cover six units. For integrated shore power, look at the S-750i.
Do you run a single-zone refrigerated trailer?
Compare Precedent units
Every Precedent side by side, with the test conditions under each group.
| 4 units | S-600 | S-700 | C-600 | S-750i |
|---|---|---|---|---|
| Cooling on the engineSystem net cooling capacity at 100°F ambient and high engine speed (the S-750i on diesel). | ||||
| Box at 35°F | 60,000 BTU/hr | 68,000 BTU/hr | 59,000 BTU/hr | 68,000 BTU/hr |
| Box at 0°F | 32,000 BTU/hr | 37,000 BTU/hr | 34,000 BTU/hr | 43,000 BTU/hr |
| Box at -20°F | 19,000 BTU/hr | 23,000 BTU/hr | 20,000 BTU/hr | 26,500 BTU/hr |
| Cooling on electric powerThe S-750i on its standard electric shore power. For the others: Thermo King offers several electric standby options; ask your shop about performance on the one you choose. | ||||
| Box at 35°F | 57,000 BTU/hr | 50,000 BTU/hr | 51,500 BTU/hr | 64,000 BTU/hr |
| Box at 0°F | 32,000 BTU/hr | 35,000 BTU/hr | 34,000 BTU/hr | 40,000 BTU/hr |
| Box at -20°F | 19,000 BTU/hr | 23,000 BTU/hr | 20,000 BTU/hr | 25,500 BTU/hr |
| HeatingSystem net heating capacity at 35/0°F ambient, on the engine (the S-750i on diesel). | ||||
| At 35/0°F ambient | 59,500 BTU/hr | 72,000 BTU/hr | 50,000 BTU/hr | 36,000 BTU/hr |
| Airflow | ||||
| Evaporator | 3,350 ft³/min | 3,300 ft³/min | 3,350 ft³/min | 3,300 ft³/min at high speed |
| Engine | ||||
| Model | TK488CR | TK488CRH | TK486V25 | TK488CR1 |
| RPM by speed | 2,050 / 1,250 | 2,600 / 1,450 | 2,200 / 1,340 | 2,050 / 1,810 / 1,250 |
| HP rating | 33 HP at 2,050 RPM | 35 HP at 2,600 RPM | 24 HP at 2,200 RPM | 33 HP at 2,050 RPM |
| Compressor | ||||
| Model | X430L, 30.0 in³ | X430L, 30.0 in³ | X430L, 30.0 in³ | TKSR151 scroll, 9.4 in³ |
| Refrigerant | ||||
| Type | R452A | R452A | R452A | R452A |
| Charge | 14.5 lbs | 14.5 lbs | 14.5 lbs | 16 lbs |
| Weight | ||||
| System | 1,888 lbs | 1,882 lbs | 1,858 lbs | 2,200 lbs |
| Where it runs | ||||
| California (CARB) | Yes, all 50 states | Yes, all 50 states | No, from model year 2023 | Yes, all 50 states |
| Electric power | Standby, optional | Standby, optional | Standby, optional | Shore power, standard |
- On every Precedent unit24 months of complimentary TracKing telematics from the factory
- Across the lineR452A refrigerant
Keep it running.
The service, parts and plans behind every Precedent TKSE sells.
Service Factory-trained technicians at seven shops, and mobile service trucks that come to the unit.
Parts Every TKSE shop has a parts department with genuine Thermo King parts.
Guaranteed Maintenance Thermo King's fixed-cost agreement for planned and unscheduled maintenance and breakdown repairs. Your shop sets it up.
Questions
What's the difference between the S and C models?
S models (S-600, S-700, S-750i, S-610M, S-610DE) carry CARB Evergreen certification for all 50 states. C models (C-600, C-600M) have engines under 25 HP and, from model year 2023, aren't for operation in California.
Single-temperature or multi-temperature?
Single-temperature units hold one setpoint. Multi-temperature units run more than one zone, so you can haul fresh and frozen together. The S-610DE runs two zones without adding remote evaporators.
Which unit has the most cooling?
At 35°F, the S-700 and S-750i are both rated at 68,000 BTU/hr on the engine. At -20°F the S-750i is rated highest, at 26,500 BTU/hr.
Can I get one with electric standby?
The S-750i has electric shore power built in. For the others, Thermo King offers several electric standby options; ask your shop which fits.