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5 Best Best Diesel Coolant Heaters of 2025

Last Updated - 2025/08/29

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Eberspächer

Eberspacher Espar HS3 CS D6L 24V Hydronic Water Heater & Diesel Engine Parking Heater For Fleets, Trucks, Off Road Equipment Includes Full Installation Kit and EasyStart Pro Timer. 24V Vehicles Only.

Eberspächer

CA$1,595.00

More Details
Main highlights
- RELIABLE PERFORMANCE-EXCEPTIONAL SERVICE: Founded in 1865, Eberspacher has been manufacturing innovative vehicle heating systems since 1934. Every high-quality Espar diesel heater is engineered to provide years of reliable starts in harsh winter conditions with minimal maintenance costs and downtime. Beware of low-cost diesel air heater and oil heater alternatives from unknown competitors that offer no warranty, after-sales service or readily available parts.
- HIGH HEAT OUTPUT-LOW OPERATING COST! High heat output (1300 to 5600 watts) and low operating costs (under $0.50/hour) allow you to keep your truck, dozer, excavator or other equipment warm in cold weather. Using an engine preheater allows for warming of coolants, hydraulic oils, and fuel so you can get working faster. Benefit from reducing fuel usage costs, maintenance and repair costs due to engine wear and tear from cold engine starts and excessive engine idling.
- FLEXIBLE MOUNTING OPTIONS: The diesel heater's compact size makes it easy to mount in a variety of locations to suit both your installation and heating needs. You now have the flexibility to have instant engine coolant heating even if your vehicle has limited engine compartment space. You can mount the heater remotely outside of the engine compartment and still get all the benefits that an engine coolant heater offers.
- EXCEPTIONAL WARRANTY! With a full two-year (2000 Operating Hour) warranty and full after-sales service and support, you can buy confidently knowing that if you need technical assistance, warranty support or heater service you can get the help you need when you need it.
- COMMERCIAL DIESEL HEATER: The D6L is one of the most efficient heaters on the market for meeting your truck cab or heavy-duty equipment needs. Put an end to cold engine starts when your equipment is at a remote location. Equipment operators know how difficult it can be to start an engine in extreme cold when there is no option to plug in a block heater. The Easy Start Pro timer allows you to program the heater to start so you can preheat the engine before you get on site. Makes your engine last!
CA$1,595.00
2

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Eberspächer

Hydronic S3 Universal Vehicle Kit w/Easy Start Pro 12V

Eberspächer

CA$1,395.00

More Details
Main highlights
- RELIABLE PERFORMANCE-EXCEPTIONAL SERVICE: Every high quality Espar diesel heater is engineered to provide years of reliable harsh winter service with minimal maintenance costs and downtime. If you need espar parts and after sales service we are here to provide you with both. Beware of low cost alternatives that offer no warranty, after sales service or readily available parts.
- HIGH HEAT OUTPUT-LOW OPERATING COST! High heat output (1300 to 5200 watts) and low operating costs (less than $0.50/hour) allow you to keep your truck, boat or RV warm in cold weather while saving money on expensive fuel and reducing costly engine wear and tear from cold engine starts and excessive engine idling.
- FLEXIBLE MOUNTING OPTIONS: The compact size of the diesel heater makes it easy to mount in a variety of locations to suit both your installation and heating needs. You now have the flexibility to have instant engine coolant heating even if your vehicle has limited engine compartment space. You can mount the heater remotely outside of the engine compartment and still get all the benefits that an engine coolant heater offers .
- EXCEPTIONAL WARRANTY! Two year (2000 Operating Hour) warranty with full after sales service and support you can buy confidently knowing that if you need technical assistance, warranty support or heater service we are here to help you.
- DIESEL RV HEATER: The D5E is one of the most efficient water heaters for RV hot water heating. No matter if you have an RV, van or a custom built overlander, the Espar D5 series hydronic heater provides you with endless hot water without having to rely on using propane for your water heating needs. Excellent for a warm indoor or outdoor shower when camping without having to worry about consuming large amounts of fuel.
CA$1,395.00
3

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

KSACORT

KSACORT Coolant Heater Engine Heater Diesel Coolant Circulation Heater 12V 5KW for Cars Truck and RV silver HE-1

KSACORT

CA$550.00

More Details
Main highlights
- 5.【SERVICE】High quality and comprehensive after-sales service: The main coolant heater is provided with a two-year warranty, and the spare parts of the heater set are provided with replacement service at low cost. We provide comprehensive after-sales service and technical support, If you have any installation or usage issues, please contact our store. We will provide 24/7 service.So you can buy with confidence.
- 4.【EASY INSTALLATION 】Installation and maintenance: Suitable for 12v various diesel and gasoline fuel vehicles, all installation kits such as fuel pumps, water lines, fuel lines, hose clamps are included. The compact size of the HE-1 coolant heater makes it easy to install in a variety of locations. With its exhaust, combustion air and diesel intake ports located just below the unit and a reasonably compact design, you can easily place the HE-1 engine heater in the engine compartment. The access cover on top of the main engine is designed for easy disassembly and maintenance.
- 3.【HIGH QUALIT】Excellent quality and high performance: The product is designed and manufactured using German technology, the coolant heater control chip imported from Europe makes the heater 35% more thermally efficient than other common heaters, the Japanese imported point piston provides high thermal value and durability, high heat output (1500-6000 watts) and low fuel consumption (＜0.3L/hr). The coolant heater combustion chamber is made of 2520 stainless steel, so it can withstand temperatures above 1300°C. The engine heater body is made of 6061-t6 aluminum which provides good structural strength and reliability. With a service life of over 7000 hours.
- 2.【COMFORTABLE】No need to plug in and remote start: The coolant heater allows the engine to reach operating temperature faster, making it easy to start the engine in extremely cold conditions. No need to plug in electricity, using the vehicle's own fuel to generate heat. It works properly in any outdoor environment, and even without an indoor garage you can still enjoy the warmth and comfort that the engine heater brings to you. There are two ways to start the coolant heater, in the car or remotely. The car heater can be started remotely by remote control to warm up the engine before you arrive at the site, and the vehicle can be running and providing warm air as soon as you strat the car.
- 1.【ECONOMICAL】Reduce the cost of vehicle use: Due to low temperatures, engines of various vehicles are difficult to start in the cold winter months. Even if the engine can be started, such forced starting increases engine wear and shortens the engine life. By preheating the engine coolant in advance, you can avoid engine wear caused by cold start and excessive engine idling, reduce maintenance costs, reduce the extra fuel consumption of cold running, and make your engine durable.
CA$550.00
4

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Newhigh

5KW 12v diesel Vehicle Kit Coolant Heater - Engine Heater similar to Webasto for Car/Caravan/Boat/RV

Newhigh

CA$780.00

More Details
Main highlights
- Suitable to Vehicles:Micro vehicles,minivans,sedans,trucks,passenger cars,station transport wagons,engineering vehicles,agricultural transportation vehicles
- Rated consumption(W):14-29 ; Working temperature(℃):-40℃－40℃
- Power:5KW;Heating medium:water/Coolant ; Fuel:Diesel;
- Low limit of under voltage protection:10.5V/21.6V;Upper limit of over voltage protection:15.5V/30V
- Fuel consumption(I/h):0.3L/h~0.6L/h ; Rated Voltage(V):DC12V
CA$780.00
5
Best Value

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

NAOKEV

Heater Engine Heater Diesel Coolant Circulation Heater 12V 5KW for Trucks, Cars, RV Trailers, Motorhomes and More

NAOKEV

CA$549.00

More Details
Main highlights
- 【No need to plug in and remote start】The coolant heater allows the engine to reach operating temperature faster, making it easy to start the engine in extremely cold conditions. No need to plug in electricity, using the vehicle's own fuel to generate heat. There are two ways to start the coolant heater, in the car or remotely. The car heater can be started remotely by remote control to warm up the engine before you arrive at the site.
- 【Low Cost Vehicle Use】 Due to low temperatures, engines of various vehicles are difficult to start in the cold winter months. Even if the engine can be started, such forced starting increases engine wear and shortens the engine life. By preheating the engine coolant in advance, you can avoid engine wear caused by cold start and excessive engine idling, reduce maintenance costs, reduce the extra fuel consumption of cold running, and make your engine durable.
- 【High Quality and Comprehensive After-sales Service】The main coolant heater is provided with a two-year warranty, and the spare parts of the heater set are provided with replacement service at low cost. We provide comprehensive after-sales service and technical support, so you can buy with confidence.
- 【Excellent Quality and High Performance】The product is designed and manufactured using German technology, the coolant heater control chip imported from Europe makes the heater 35% more thermally efficient than other common heaters, the Japanese imported point piston provides high thermal value and durability, high heat output (1500-6000 watts) and low fuel consumption (＜0.3L/hr). The coolant heater combustion chamber is made of 2520 stainless steel, so it can withstand temperatures above 1300°C.
- 【Easy Installation】Suitable for 12v various diesel and gasoline fuel vehicles, all installation kits such as fuel pumps, water lines, fuel lines, hose clamps are included. The compact size of the haokey coolant heater makes it easy to install in a variety of locations. With its exhaust, combustion air and diesel intake ports located just below the unit and a reasonably compact design, you can easily place the HE-1 engine heater in the engine compartment.
CA$549.00

5 Best Best Diesel Coolant Heaters of 2025

Eberspacher Espar HS3 CS D6L 24V Hydronic Water Heater & Diesel Engine Parking Heater For Fleets, Trucks, Off Road Equipment Includes Full Installation Kit and EasyStart Pro Timer. 24V Vehicles Only.

Hydronic S3 Universal Vehicle Kit w/Easy Start Pro 12V

KSACORT Coolant Heater Engine Heater Diesel Coolant Circulation Heater 12V 5KW for Cars Truck and RV silver HE-1

5KW 12v diesel Vehicle Kit Coolant Heater - Engine Heater similar to Webasto for Car/Caravan/Boat/RV

Heater Engine Heater Diesel Coolant Circulation Heater 12V 5KW for Trucks, Cars, RV Trailers, Motorhomes and More

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