10 Best Engine Block Heater 2025 in the United States

The HOTSTART TPS151GT10-000 is a solid option for those looking for an engine block heater, particularly for diesel and gas engines between 5.7 to 8.2 liters in displacement. Its design allows it to pre-heat the engine coolant without needing a pump, utilizing a thermosiphon principle, which simplifies installation and reduces maintenance concerns. With a wattage of 1.5 kW and a voltage of 120V, it can easily warm the engine to a temperature range of 100°F to 120°F, making it suitable for cold weather starts, especially in trucks and construction equipment.

One of its main strengths is its versatility; it works well with various applications including marine and industrial engines. The unit is also praised for its build quality and durability. Additionally, with a one-year warranty, users can have peace of mind regarding its reliability.

However, there are a few things to consider before making a purchase. While it's effective for larger engines, it may not be the best fit for smaller engines, as it's designed specifically for those with 350 to 500 CID. Installation could require some technical know-how, as it may not be as straightforward for everyone, particularly those unfamiliar with engine components. Also, being a 120V heater, there might be limitations depending on the power supply available in certain locations.

The Zerostart 3500022 Engine Block Immersion Heater offers a practical solution for quick winter starts and reducing engine wear, specifically designed for Cummins and Paccar engines. With a 750-watt power capacity and a 120-volt requirement, it provides sufficient heat to ensure smooth engine operation in cold weather. Its 3/4" NPT thread design and 6' cord make installation straightforward, particularly for users familiar with vehicle maintenance.

It is CSA approved, which assures compliance with safety standards, enhancing user confidence in its reliability and safety. The heater's durability is bolstered by its solid build quality, crafted by the well-regarded Phillips & Temro Industries. Weighing under a pound, it is lightweight and manageable during installation.

It is crucial to check the Zerostart catalog for specific engine compatibility to avoid potential mismatches. Additionally, users unfamiliar with engine installations may find the setup slightly challenging without professional assistance. This heater is best suited for vehicle owners looking to ensure efficient engine performance during cold weather, particularly those with compatible Cummins or Paccar engines.

The HOTSTART Engine Heater TPS181GT12-001 is a coolant preheater designed for use in diesel and gas engines, including those in construction equipment, trucks, marine, and industrial applications. This heater is effective for engines with a displacement range of 500-700 CID (8.2-11.5L). It operates at 120 volts, providing 1.8 kW of power, and draws 15 amps, which should be sufficient for most needs within its specified range.

The use of the thermosiphon principle eliminates the need for a pump, simplifying the installation process and reducing potential maintenance issues. It comes with a Nema 5-20 rated plug, ensuring compatibility with standard power outlets. The built-in remote thread-in fixed temperature thermostat helps maintain optimal operating temperatures, enhancing engine efficiency and lifespan.

The heater's build quality seems robust, with positive feedback highlighting its durability and performance. Safety features appear adequate, although specific safety certifications are not mentioned. Installation is generally straightforward, thanks to the absence of a pump and the provided plug. However, some users may find the fixed temperature setting limiting if their specific use case requires more flexibility. This product is well-suited for users looking for a reliable and efficient engine preheater for medium to large engines in various applications.