Image: Industrial power cabinet installed on street What is an Engine Block Heater?
An engine block heater is an electrical device designed to warm the engine blocks and internal fluids before starting the engine. Engine oils can thicken during cold weather, making it harder for the generator to function. If you forcibly start the engine in a cold climate in such a condition, it can cause severe wear and tear to its parts. Engine block heaters ensure that your standby generators maintain a temperature between 100 and 120 degrees Fahrenheit. At higher temperatures, the engine oil becomes less viscous and flows easily, providing better lubrication to the engine parts. This way, the block heater ensures your generator starts faster while reducing the friction that comes with cold starts. It can also save fuel and emissions by helping the engine reach its optimal operating temperature more quickly.Types of Engine Block Heaters
Not all engine block heaters are the same. Some heat the engine coolant directly, while others heat the engine. Some are attached to the exterior of the engine block, while others are incorporated into the engine compartment. Before deciding on a block heater that best suits your needs, you need to understand how each type works. Here are some popular types of engine block heaters for generators:- Immersion heaters are installed in the oil sump of the engine and heat the engine oil directly. They are typically powered by electricity and are available in different sizes and wattages to match the engine.
- Magnetic Heaters are attached outside the engine block and use a magnetic field to heat the metal and internal engine components. Easy to install and remove, they are ideal for smaller engines.
- Dipstick Heaters are inserted into the engine instead of the regular engine oil dipstick. They consist of an elongated heating element that directly heats the oil.
- Circulation Heaters use a pump to circulate warm coolant through the engine block and heat it indirectly. They are typically more complex to install than other engine block heaters but are effective for heating larger engines.
- Cartridge Heaters are inserted directly into the engine block and heat the metal from the inside. They are usually used for high-performance engines.
Image: power plant and generators How Do You Use an Engine Block Heater?
The working and installation process can vary across heater types. Magnetic heaters are easier to install, while circulation heaters should be professionally installed. You should choose a heater based on your need and DIY comfortability. Once you install the heater, connect it to a grounded electric outlet using a heavy-duty extension cord. Ensure that the cord is rated for outdoor use and can handle the wattage of the heater. Per the manufacturer’s instructions, turn on the block heater and allow it to run for a few hours. The timing may vary depending on the type of heater and the outside temperature. As a rule of thumb, leave your block heater plugged in for 1 to 2 hours before starting your engine. Most block heaters are connected to a constant electric supply or have a thermostat included to maintain and regulate engine coolant and temperature. It is important to disconnect the heater when you start running the engine. Some generator block heaters may be designed to operate using an internal battery, but this is less common.How Do You Choose the Right Engine Block Heater?
There are several things to consider, from engine type to heater durability and cost, before you choose an engine heater. Here are a few tips to help you make the best pick:- Know your generator type first. Is it a diesel-powered generator or natural gas generator? The heater requirement will be different for each type.
- Check the generator’s label or owner’s manual to determine your engine size and type. It will help you determine the size of your heater compatible with your generator.
- If you live in a very cold region, consider choosing a heater with high heating capacity.
- In harsh climates, you may also want to consider an engine block heater with a built-in thermostat or timer that helps regulate the temperature.
- Ensure that the heater fits your generator’s engine block and is compatible with your power source (e.g., 120V AC, 240V AC).
- Finally, ensure that you buy a high-quality heater from a reputable brand.
How to Maintain an Engine Block Heater
Image: Technician inspecting switchboard and connecting cable. Like all electric devices, an engine block heater requires proper care and maintenance to stay efficient for a long time. You can also pair your block heater with an engine warming blanket for optimal results in freezing temperatures. Here are a few ways to maintain the heater to ensure its longevity: 
