Engine Block Heater for International Navistar Maxxforce 15 1500W

Turn your ProStar or LoneStar from a cold-start liability into a reliable winter workhorse.

Heavy-Duty 1500W Engine Freeze Plug Heater for International MaxxForce 15

The MaxxForce 15 is a massive 15.2L iron block that holds a staggering amount of coolant, making it a nightmare to start in sub-zero temperatures. Without a pre-heater, these engines suffer from severe "dry start" friction and excessive wear on the high-pressure oil system. This 1500W immersion heater is the "Big Rig" solution, delivering industrial-grade heat directly into the water jacket to ensure your oil flows and your turbo is protected from the first turn of the key.

Specifically designed for the Navistar MaxxForce 15 (EPA10 and later), this heater is a direct replacement for the factory freeze plug. Because the MaxxForce 15 shares its core architecture with the heavy-duty CAT C15 block design, this heater is engineered to handle the high vibration and thermal cycling of Class 8 long-haul applications. The copper element provides the fastest possible heat transfer, cutting down your pre-heat time significantly compared to lower-wattage generic units.

Technical Specifications

Why You Need This Upgrade

• Reduces Starter Fatigue: A warm block significantly lowers the resistance on your starter motor and batteries, preventing the dreaded "click-no-start" on freezing mornings.
• Protects High-Pressure Oil Seals: By warming the block, you prevent the high-pressure oil system from hitting the extreme PSI spikes caused by cold-thickened oil.
• OEM-Grade Efficiency: Unlike tank heaters that lose heat through hoses, this immersion element sits directly in the coolant for 100% thermal efficiency.
• Reduced Emissions/Regen Issues: Getting your engine to operating temperature faster helps prevent the excessive soot buildup that plagues MaxxForce engines during long cold-idling sessions.

Installation & Fitment Notes

Installation requires the removal of one factory freeze plug (typically located on the right side of the engine block). Ensure the bore is cleaned of all rust and debris with steel wool before pressing the new heater in. **Crucial:** Never plug the heater in until the cooling system is completely refilled and the engine has been run to purge all air pockets, or the element will burn out instantly.

Don’t let a cold snap park your fleet—give your MaxxForce 15 the industrial heat it needs to stay on the road.