Quiet Diesel Air Heater for Efficient Comfort in Your Vehicle
Experience fast, quiet warmth with low fuel consumption and reliable starts in extreme cold. The Espar Airtronic S3 D2L 12V diesel air heater delivers 2,900–7,500 BTU (0.85–2.2 kW) of clean, efficient heat — controlled precisely with the EasyStart Pro controller.
Benefits & Use Cases
The Espar D2L is built for professional operators, fleet owners, and custom builders who need dependable heat in demanding environments. Its compact design, automatic altitude adjustment, and smooth modulation make it ideal for year-round operation — whether on the road, at the job site, or off-grid.
- Efficient diesel combustion for maximum fuel economy
- Ultra-quiet operation for restful nights and low cabin noise
- Automatic altitude adjustment up to 9,800 ft (3,000 m)
- Low electrical consumption — perfect for battery-supported systems
- Compact form factor — fits under seats or in tight compartments
- EasyStart Pro Controller for scheduling and precise temperature control
Technical
- Fuel: Diesel (HVO/GTL compatible)
- Voltage: 12V
- Output: 2,900–7,500 BTU (0.85–2.2 kW)
- Fuel consumption: 0.02–0.07 gal/h (0.10–0.27 L/h)
- Power draw: 6–27 W during operation
- Max altitude: ≈13,120 ft (4,000 m) automatic altitude adjustment
- Dimensions (heater body): 12.2 × 4.5 × 4.8 in (310 × 115 × 122 mm)
- Part numbers: Heater 25.2953.05.0000 (252953050000); universal install kit 252029800000
- Certifications/ratings: EN 55025 class 5; IP5K4K (operating), IP5K6K/IP5K9K (not operating)
- Warranty: 2 years (extendable by 1 year)
Vehicle Compatibility
Designed for diesel-powered vehicles and equipment requiring independent cabin heat:
- Van conversions and camper builds — efficient heating for all-season adventures
- RVs and motorhomes — quiet, reliable warmth for off-grid living
- Truck sleepers and long-haul fleets — stay warm without idling the engine
- Construction and agricultural equipment — maintain comfort during cold workdays
- Utility, service, and emergency vehicles — dependable diesel heat for field operations
- Off-highway and industrial machinery — compact installation with consistent performance
- Small diesel boats under ~22 ft (Marine installation kit required)
Not suitable for gasoline vehicles or electric-only platforms.
Kit Includes
- Espar Airtronic S3 D2L 12v Heater
- EasyStart Pro Controller
- Fuel pump (12v)
- Fuel hose
- Exhaust Silencer / Muffler
- Electrical harnesses - Plug n' Play
- Stainless steel exhaust system - approx. 6.6 ft (2m)
- Combustion intake pipe ~3.3 ft (1 m)
- Flexible ducting (60 mm. diameter) - 1.64 ft (0.5 m)
- Inlet grills
- Air outlet grill (60 mm. diameter)
- Screws, clips and plastic straps required for installation
- Installation manual CD (Scan QR code for installation manual download)
- Warranty documentation
Manuals
Technical Specifications of the Espar Airtronic S3 D2L Diesel 12V Heater Kit with EasyStart Pro Controller
- Fuel:
- Diesel
- Voltage:
- 12V
- Max. Heat Output:
- 7,500 BTU (2.2 kW)
- Fuel Consumption:
- 0.02 - 0.1 gal/h (0.06 - 0.28 l/h)
- Heater model:
- Airtronic S3
- Max. Altitude:
- 13,120 ft (4,000 m)
Included in the kit:
Quiet Diesel Air Heater for Efficient Comfort in Your Vehicle
Experience fast, quiet warmth with low fuel consumption and reliable starts in extreme cold. The Espar Airtronic S3 D2L 12V diesel air heater delivers 2,900–7,500 BTU (0.85–2.2 kW) of clean, efficient heat — controlled precisely with the EasyStart Pro controller.
Benefits & Use Cases
The Espar D2L is built for professional operators, fleet owners, and custom builders who need dependable heat in demanding environments. Its compact design, automatic altitude adjustment, and smooth modulation make it ideal for year-round operation — whether on the road, at the job site, or off-grid.
- Efficient diesel combustion for maximum fuel economy
- Ultra-quiet operation for restful nights and low cabin noise
- Automatic altitude adjustment up to 9,800 ft (3,000 m)
- Low electrical consumption — perfect for battery-supported systems
- Compact form factor — fits under seats or in tight compartments
- EasyStart Pro Controller for scheduling and precise temperature control
Technical
- Fuel: Diesel (HVO/GTL compatible)
- Voltage: 12V
- Output: 2,900–7,500 BTU (0.85–2.2 kW)
- Fuel consumption: 0.02–0.07 gal/h (0.10–0.27 L/h)
- Power draw: 6–27 W during operation
- Max altitude: ≈13,120 ft (4,000 m) automatic altitude adjustment
- Dimensions (heater body): 12.2 × 4.5 × 4.8 in (310 × 115 × 122 mm)
- Part numbers: Heater 25.2953.05.0000 (252953050000); universal install kit 252029800000
- Certifications/ratings: EN 55025 class 5; IP5K4K (operating), IP5K6K/IP5K9K (not operating)
- Warranty: 2 years (extendable by 1 year)
Vehicle Compatibility
Designed for diesel-powered vehicles and equipment requiring independent cabin heat:
- Van conversions and camper builds — efficient heating for all-season adventures
- RVs and motorhomes — quiet, reliable warmth for off-grid living
- Truck sleepers and long-haul fleets — stay warm without idling the engine
- Construction and agricultural equipment — maintain comfort during cold workdays
- Utility, service, and emergency vehicles — dependable diesel heat for field operations
- Off-highway and industrial machinery — compact installation with consistent performance
- Small diesel boats under ~22 ft (Marine installation kit required)
Not suitable for gasoline vehicles or electric-only platforms.
Kit Includes
- Espar Airtronic S3 D2L 12v Heater
- EasyStart Pro Controller
- Fuel pump (12v)
- Fuel hose
- Exhaust Silencer / Muffler
- Electrical harnesses - Plug n' Play
- Stainless steel exhaust system - approx. 6.6 ft (2m)
- Combustion intake pipe ~3.3 ft (1 m)
- Flexible ducting (60 mm. diameter) - 1.64 ft (0.5 m)
- Inlet grills
- Air outlet grill (60 mm. diameter)
- Screws, clips and plastic straps required for installation
- Installation manual CD (Scan QR code for installation manual download)
- Warranty documentation
Manuals
Choosing Guide
Option Choosing Guide for this product is coming soon, please contact support@heatso.com if you need help picking the right options or have any questions.
Shipping
- United States - 1-5 Working Days
- United Kingdom - 2-5 Working Days
- European Union - 2-7 Working Days
- Australia / New Zealand - 5-14 Working Days
- Rest of World - 5-14 Working Days
There may be a delay if the order is shipped to a PO or parcel shop address. Please note, some couriers do not offer shipping to PO boxes.
View full shipping & Delivery information
Returns
You can return or exchange goods within 14 days from the date of purchase if the item is unused and brand new in unopened packaging. You must contact us before returning any goods, though. Additional deductions might be applied as indicated in the Returns section of our Terms and Conditions.
Warranty Information
Most heaters come with 2 year warranty + optional 1 year extended Warranty available
- Parts - 1 Year Warranty
- Refrigerators - 2 Year Warranty
- AC Systems - 1 Year Warranty
- Heavy duty heating equipment (10 kW+) - 1 Year Warranty
- Other items - 1 Year Warranty
Installation, servicing and maintenance must be done in accordance with manufacturers guidelines. Failure to follow these guidelines will result in voiding your warranty.
We provide free technical and installation support via email or phone to all of our customers who purchase a heater, heater kit or other products from Heatso. We take pride in our customer service and want to ensure that your heater system is properly installed. As a result, if you have any difficulties, please do not hesitate to contact us.
If you require removing and/or refitting your item, please visit a local professional or authorized specialist, if you can not find one you can contact us and we will try to recommend a local partner to assist with the task. The cost of removing and/or refitting this item is not covered by the warranty.
Customer reviews
Write a Review
Espar Airtronic S3 D2L Diesel 12V Heater Kit with EasyStart Pro Controller
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Works well
I have been running this unit is my diesel ram promaster for 3 .months straight. After the install it's been amazing so far.
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great device
Purchased this one recently for my van. Works perfectly, love it.