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  • Eberspacher Espar Airtronic Heater Kit AS3 D2L (Diesel) 12V Upgraded Version of The S2 D2

Eberspacher Espar Airtronic Heater Kit AS3 D2L (Diesel) 12V Upgraded Version of The S2 D2

4.2 out of 5 stars (31)
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$1,275.00 with 6 percent savings
Typical price: $1,355.00
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Purchase options and add-ons

  • The Eberspacher Airtronic AS3 D2L is the brand-new diesel heater on the market, offering 2kW / 6824 BTU maximum heat output. This power, combined with the D2L’s advanced features and engineering, makes it one of the best 2kW diesel heaters on the market.
  • Compact design for convenient installation, i.e. Under passenger seat. Airtronic D2L is the same size as the AS3 B2L but smaller in size than B4L.
  • The Eberspacher D2L is engineered to operate in extreme conditions and high altitudes. It can operate in temperatures as low as -46°C / - 50°F and at altitudes of up to 18K feet. This is possible thanks to its integrated altitude sensor, and unlike earlier models there is no additional wiring or installation required for high altitude operation.
  • Controlling the heater is simple because it has an integrated temperature sensor. The Eberspacher D2L’s stepless blower system enables optimized heating control and maximizes performance efficiency.
  • The stepless blower system also ensures quieter performance compared to previous models, while the dampened fuel pump piston reduces clicking noise. The Eberspacher D2L also sports a brushless fan which helps to further reduce noise.
  • The Eberspacher D2L is highly versatile when it comes to installation. Its adaptable ducting system, which can go up to 15 meters / 49ft in length, features outlets of either 60mm or 75mm. Ducting outlets are closable and can have different degree grilles and outlet types, plus the number of outlets can be varied based on the complexity of the ducting system.
  • The Eberspacher D2L is easier to install than previous models. It features plug and play installation which requires fewer tools, enabling DIY installation.
› See more product details

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This item: Eberspacher Espar Airtronic Heater Kit AS3 D2L (Diesel) 12V Upgraded Version of The S2 D2
$1,275.00
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Ships from and sold by PW Holdings.
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Product Description

The Eberspacher Airtronic AS3 D2L is the brand-new diesel heater on the market, offering 2kW / 6824 BTU maximum heat output. This power, combined with the D2L’s advanced features and engineering, makes it one of the best 2kW diesel heaters on the market. An upgraded version of the Airtronic S2 D2.

Product information

Warranty & Support

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Eberspacher Espar Airtronic Heater Kit AS3 D2L (Diesel) 12V Upgraded Version of The S2 D2

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WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

What's in the box

  • Espar Airtronic AS3 D2L 12v Heater, Fuel pump (12v), Fuel hose, Exhaust Silencer, Electrical harnesses Stainless steel, Exhaust pipe, Combustion intake pipe, Flexible ducting, Inlet / Outlet grills, Air outlet, Screws, Clips, and Plastic Straps required for installation, Installation manual, Warranty documentation
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    Customer reviews

    4.2 out of 5 stars
    31 global ratings
    Sponsored

    Customers say

    Customers find the heater works well and provides perfect heating performance. The installation process is straightforward, with one customer noting that the video instructions make it easier to follow initially.
    AI Generated from the text of customer reviews

    Select to learn more

    10 customers mention functionality, 9 positive, 1 negative
    Customers find that the heater works great.
    ...Fits right in place of the old one with no new drilling. Unit works great, heating is perfect, well worth the money....Read more
    The Espar works well. I have a S3 D2, there were no useful U-Tube videos for the S3 (the new model)....Read more
    Very fast delivery. Espar working great. Will recommend this shiping company !Read more
    ...It’s easy to use and works great.Read more
    7 customers mention installation, 6 positive, 1 negative
    Customers find the installation straightforward, with one mentioning that the video instructions are easier to follow initially.
    Easy install once I found the seven o savage video. Warms the van pretty quickly. Louder than I expected. Not the most intuitive UI on the thermostatRead more
    ...sub- systems: The physical install of the furnace, the install of the electrical system, and plumbing the fuel line....Read more
    I installed this heater in our sprinter van this fall. Very straightforward install. The video instructions are much easier to follow initially....Read more
    ...Not to hard to figure out but can be annoying, take your time because you don’t need all the wires they send.Read more
    5 customers mention heating performance, 5 positive, 0 negative
    Customers are satisfied with the heater's performance, with one mentioning it provides the most accurate temperature readings.
    Easy install once I found the seven o savage video. Warms the van pretty quickly. Louder than I expected. Not the most intuitive UI on the thermostatRead more
    ...That is what this is. A mini furnace and it heats like one. Fuel consumption is barely noticeable....Read more
    ...able to set your indicator temp to the right temp so you get the most accurate temperature....Read more
    ...Soon glad I did. Efficient and warm, down to single digits in my sleeper.Read more

    Top reviews from the United States

    • Twowheels_80524
      5 out of 5 stars
      Excellent diesel heater
      Reviewed in the United States on January 25, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I installed this heater in our sprinter van this fall. Very straightforward install. The video instructions are much easier to follow initially. We just completed our third winter trip and it worked perfectly. On nights with the temperatures well below freezing this heater kept the van at a comfortable 65F. It is more expensive than the Chinese versions, but it is MUCH quieter and more fuel efficient. If you are serious about living in your van or RV in the winter, this is a must have.

      6 people found this helpful
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    • Bruinzfan
      5 out of 5 stars
      Awesome
      Reviewed in the United States on October 6, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Works awesome. Purchased a knock off. Then thought. This is under my bunk. Decided to spend the money on the name brand. Soon glad I did. Efficient and warm, down to single digits in my sleeper.

      Sending feedback...
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      Sending feedback...
      Thanks, we'll investigate in the next few days.
    • Brian
      4 out of 5 stars
      Instructions need improvement
      Reviewed in the United States on January 14, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I replaced a cheaper heating unit with this one and could be happier. Fits right in place of the old one with no new drilling. Unit works great, heating is perfect, well worth the money. I would have given it this 5 stars if they would made the wiring instructions more clear. Not to hard to figure out but can be annoying, take your time because you don’t need all the wires they send.

      One person found this helpful
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      Sending feedback...
      Thanks, we'll investigate in the next few days.
    • Eyes Open
      5 out of 5 stars
      Super!
      Reviewed in the United States on June 9, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      After watching YouTube videos I was a bit concerned about it being a tough DIY addition to our Sprinter, but it was all reasonable. The key is to understand that you need to treat the installation as 3 separate install sub- systems: The physical install of the furnace, the install of the electrical system, and plumbing the fuel line.

      Yes, it takes a few days if your van is all built out like ours was. The vendor was very responsive to my questions and provided YT links, that I ended up not needing after. The kit was complete, I didn’t need any other parts of any kind. The link to the Espar manual provided sufficiently clear instructions that were further clarified by the vendor’s info. There were some minor leftover parts, mostly related to the unused fuel siphon tube, that were unneeded because MB provides a ready to go T-connect for this very purpose.

      While the YT installers were all concerned about the exhaust placement due to potential fumes coming in the sliding door, I find the furnace is using so little fuel that the fumes are barely noticeable, and I am quite sensitive to the smell of diesel exhaust. That said, we used it in mild temps only down to about 41°, so in colder temps where the furnace would need to run more and harder, the fumes might be more noticeable. So, if you decide to run the outlet over to the driver’s side, then you will need to procure more exhaust pipe, either the expensive stainless or cheaper galvanized version because the supplied pipe is about 12” too short to go far enough to exit the fumes out from underneath the van. That said, if enough fumes were being discharged to be a problem by the sliding door, my guess is that they would be nearly as unpleasant on the driver’s side as they would drift back to our rear open window. At least the slider gets closed and sealed shut once we retire for the night, so fumes are only possible when the slider is opened and closed for some brief outside need.

      Sprinters: There is a diagonally oriented flat depression formed in the floor pan specifically for these heaters, which simplifies the installation of the Espar, if the stock MB additional “house” battery is removed. We replaced our MB auxiliary battery with a 100AH slimline LiFePO battery, so there was plenty of room for the battery, furnace, and a MPPT charge controller for the new battery. Without a doubt the most difficult and stressful part of the installation was cutting the hole in the floor. I wisely opted to use a drill-powered sheet metal nibbler I ordered from Amazon. With the nibbler I was able to cut a close-tolerance oval hole that matched the rubber foot of the furnace. Using the diagonal placement allows the use of the included square floor plate and gasket. The plate allows a sloppily cut floor hole to adequately covered and sealed, which means a mostly square cut can be made easily with a Sawzall type tool. Using the plate also aids the connection of the tubes and pipes from inside the van, rather than from underneath, so I recommend using the plate. That said, using the plate and having a big hole can create a significant water trap that will need well executed sealing from under the van.

      26-0123 UPDATE: If installing the heater on the passenger side of the vehicle, the fuel line will have to cross the catalytic converter’s path, so one must be extremely careful to take a path with the plastic (nylon?) fuel line that is as high as possible and as far as can be managed from the Cat. I ran our line along where one of the cross-beams is welded to the floor and this was to the rear of the Cat. I periodically check the installation for signs of discoloration or distortion in the line.

      8 people found this helpful
      Sending feedback...
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    • Stanley
      1 out of 5 stars
      Beware: Poor Warranty Support and Difficult Installation
      Reviewed in the United States on February 26, 2026
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I purchased this unit in September 2025, but it stopped working after only a couple of months. When I reached out to the company, they made constant excuses and ultimately refused to honor their warranty.

      Pros: None so far.

      Cons: > * Installation: Extremely difficult. The manual is poorly written—I had to rely on YouTube to figure it out.

      Customer Service: Unhelpful and deceptive regarding the warranty.

      Returns: Be careful! This unit is not eligible for free returns on Amazon.

      I regret this purchase. If you have a problem with the unit, expect a very hard time getting it resolved (it has been 2 months already).

      2 people found this helpful
      Sending feedback...
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      Sending feedback...
      Thanks, we'll investigate in the next few days.
    • Sokun Keo
      5 out of 5 stars
      The console is too small to see.
      Reviewed in the United States on December 17, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      It works as described, and it works as I expected.

      The problem is it will not shut down when the temperature is reached.

      The console is too small to see.

      2 people found this helpful
      Sending feedback...
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      Sending feedback...
      Thanks, we'll investigate in the next few days.
    • Flyonly32
      5 out of 5 stars
      The best van/ bus heater no question. Unless you are a Sprinter van lifer wannabe.
      Reviewed in the United States on October 14, 2025
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      Its an Espar. Expect nothing but quality and durability. I will let others buy the cheap chinese knockoffs. Yes, you can hear them quietly run. What furnace doesn't make a little humming. That is what this is. A mini furnace and it heats like one. Fuel consumption is barely noticeable. Espar is proven and worth the cost if you are a true roaming nomad and not just another Sprinter weekend warrior.

      One person found this helpful
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    • ronald
      4 out of 5 stars
      Excellence
      Reviewed in the United States on November 18, 2024
      Brief content visible, double tap to read full content.
      Full content visible, double tap to read brief content.

      I've had espars in my past trucks but this one was the first time I installed one. The unit works great. Just as it should. The easystart pro is a lot nicer than the past controllers. Best part is being able to set your indicator temp to the right temp so you get the most accurate temperature. The installation, I had to figure everything out which wasn't to hard but I feel they could have given instructions. The units electric cords was unexplained but I did eventually figure it out. Having no instructions on how to use the easystart pro would have been nice as well but I did figure it out.

      6 people found this helpful
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    See more reviews
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    Product Summary: Eberspacher Espar Airtronic Heater Kit AS3 D2L (Diesel) 12V Upgraded Version of The S2 D2

    From Eberspächer

    4.2 out of 5 stars, 31 ratings

    Customer reviews

    200+ viewed in past month

    Price

    One-time purchase: $1,275.00 6% Savings

    List Price: $1,355.00

    Purchasing options

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    About this Item

    • The Eberspacher Airtronic AS3 D2L is the brand-new diesel heater on the market, offering 2kW / 6824 BTU maximum heat output. This power, combined with the D2L’s advanced features and engineering, makes it one of the best 2kW diesel heaters on the market.
    • Compact design for convenient installation, i.e. Under passenger seat. Airtronic D2L is the same size as the AS3 B2L but smaller in size than B4L.
    • The Eberspacher D2L is engineered to operate in extreme conditions and high altitudes. It can operate in temperatures as low as -46°C / - 50°F and at altitudes of up to 18K feet. This is possible thanks to its integrated altitude sensor, and unlike earlier models there is no additional wiring or installation required for high altitude operation.
    • Controlling the heater is simple because it has an integrated temperature sensor. The Eberspacher D2L’s stepless blower system enables optimized heating control and maximizes performance efficiency.
    • The stepless blower system also ensures quieter performance compared to previous models, while the dampened fuel pump piston reduces clicking noise. The Eberspacher D2L also sports a brushless fan which helps to further reduce noise.
    • The Eberspacher D2L is highly versatile when it comes to installation. Its adaptable ducting system, which can go up to 15 meters / 49ft in length, features outlets of either 60mm or 75mm. Ducting outlets are closable and can have different degree grilles and outlet types, plus the number of outlets can be varied based on the complexity of the ducting system.
    • The Eberspacher D2L is easier to install than previous models. It features plug and play installation which requires fewer tools, enabling DIY installation.
    • The heater’s fuel system plugs directly into your vehicle’s fuel system or tank with a standpipe or via an auxiliary tap (if your vehicle manufacturer offers one). Installation of the fuel system has been simplified for this model, with the same line used for the whole installation.
    • The Eberspacher AS3 D2L is compatible with all 3 communication protocol technologies used by Eberspacher - CAN, LIN and S+. This means you can use your earlier generation controller with the Eberspacher D2L
    • The brushless fan ensures the Eberspacher D2L has a long operating life, increasing service time from 3k hours (on previous models) up to 5k hours. And if there are any issues, the new controller communication system allows more accurate on-screen fault diagnostics. Start up power consumption has been reduced compared to previous models.

    Product Description

    The Eberspacher Airtronic AS3 D2L is the brand-new diesel heater on the market, offering 2kW / 6824 BTU maximum heat output. This power, combined with the D2L’s advanced features and engineering, makes it one of the best 2kW diesel heaters on the market. An upgraded version of the Airtronic S2 D2.

    Important Information

    Toy Safety

    1. Our recommended age:
    2. Manufacturer's minimum age:
    3. not_suitable_under_3_years

    1. Small parts. Not for children under 3 yrs.

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