Semi Truck & Heavy Equipment Block Heaters
Big diesels outlive the trucks and tractors built around them, so heavy-duty block heater fitment goes by engine — ISX, C15, Series 60, DT466 — not by make and model. Pick your engine family below for part numbers, wattage, and exactly where the heater installs.
Cummins Block Heaters: ISX, ISB, 8.3, N14 & 855 Big Cam
Zerostart and Kat's block heater part numbers for every major Cummins diesel — ISX/QSX, ISB/QSB 5.9 and 6.7, C-series 8.3, ISL, M11/ISM, N14 and 855 Big Cam, K-series — with wattage, port size, and where each heater installs.
CAT Block Heaters: C15, C13, C7, 3406 & 3306
Block heater part numbers for Caterpillar diesels — C15/C16 ACERT, C13, C11, C10/C12, 3406/3406E, C7/3126, 3306 and 3208 — with wattage, thread size, and oil-cooler port locations from the Zerostart and Kat's application guides.
Detroit Diesel Block Heaters: DD15, Series 60 & the Two-Strokes
Block heater part numbers for Detroit Diesel engines — DD15, Series 60 (11.1/12.7/14L), Series 50, Series 40, 8.2L and the 53/71/92-series two-strokes — with wattage, port locations, and plate-heater details.
International & Navistar Block Heaters: DT466, T444E, MaxxForce
Block heater part numbers for International/Navistar diesels — DT466, DT466E, DT530, DT570, MaxxForce DT/9/10, T444E and the 6.9/7.3L IDI — with wattage, freeze-plug sizes and install locations.
Tractor Block Heaters: John Deere, Kubota, Massey Ferguson & More
Frost-plug and immersion block heater part numbers for farm tractors and compact equipment — John Deere PowerTech 4045/6068, Kubota B/L/M series, Massey Ferguson, Case IH/International, Yanmar, Zetor, Komatsu and vintage Ford — with wattage and install locations.
How these pages work
Search by engine, not truck
A Peterbilt, a Kenworth and a Freightliner can share the same ISX. HD fitment follows the engine serial plate, so that's how these pages are organized.
Real part numbers
Zerostart / Phillips & Temro numbers from the heavy-duty application guide, with Kat's equivalents where both catalogs list the engine.
120 V and 240 V
Yard shore-power pedestals and shop circuits often run 240 V. Where a 240 V element exists, it's in the table — never mix the two.
DIY install notes
Whether the heater replaces a pipe plug, a freeze plug, or a water jacket access plate — and what that means for the install.
Driving a diesel pickup instead?
Cummins-powered Rams, PowerStroke Fords and Duramax GMs are covered vehicle-by-vehicle in the vehicle finder, including factory heater availability and cord locations. And if your truck has a “wait to start” light, that's the intake grid heater — a different device that works alongside, not instead of, a block heater. For skid steers, generators, ATVs and other equipment without a highway engine, see the small-engine section.