Quiet, Gasoline 12V Heat for RAM ProMaster Van Builds
Warm your ProMaster quickly and sleep comfortably with low power draw and clean, dry heat. The Airtronic S3 B2L produces 6,800 BTU (2.0 kW) and pairs with the EasyStart Pro for simple, reliable control all year round.
Benefits & Use Cases
This gasoline 12V heater is purpose-built for ProMaster conversions and small RVs where space is tight and battery life matters. Enjoy fast warm-ups, steady overnight comfort, and quiet operation without idling.
- Efficient cabin heating on gasoline builds — no diesel tank required
- Low electrical draw (6–26 W) protects your house batteries off-grid
- Automatic altitude capability up to 13,120 ft (4,000 m) for mountain trips
- Compact body for flexible placement in van conversions and campers
Technical
- Fuel: Gasoline
- Voltage: 12V
- Max Heat Output: 6,800 BTU (2.0 kW)
- Fuel Consumption: 0.03–0.07 gal/h (0.14–0.26 l/h)
- Power Consumption: 6–26 W
- Max Altitude: 13,120 ft (4,000 m)
- Warranty: 2 years
- Dimensions (heater body): 12.2 × 4.5 × 4.8 in (310 × 115 × 122 mm)
- Certifications: ECE R122 (heating) & ECE R10 (EMC)
Vehicle Compatibility
- RAM ProMaster (adapter for aux fuel tap included)
- Van conversions & camper builds — weekenders or full-time travel
- RVs & small motorhomes — quiet, efficient off-grid heat
- Truck sleepers & long-haul fleets — warm cabins without idling
- Construction, agricultural & industrial vehicles — cab heat during downtime
- Utility & emergency service vehicles — dependable heat on duty
- Electric & hybrid vehicles — efficient auxiliary heating solution
Not suitable for diesel applications or marine use.
Kit Includes
- AS3 B2L 12V Gasoline Heater
- EasyStart Pro Controller
- Fuel pump (12v)
- Fuel hose
- Exhaust Silencer / Muffler
- Electrical harnesses - Plug n' Play
- Combustion intake pipe 1 meter
- Flexible ducting (60 mm. diameter) - 0.5 meter / 1.64 ft
- Inlet / Outlet grills - Adjustable FLAT, 45 degree 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)
The kit additionally includes the following:
- Specific RAM ProMaster Adapter for aux tap
- Pro controller extension 9.8 ft (3m)
- Floor mounting plate
- Stainless steel exhaust system - approx. 6.6 ft (2m)
Manuals
Technical Specifications of the Espar Airtronic S3 B2L Gasoline 12V RAM ProMaster kit with EasyStart Pro Controller
- Fuel:
- Gasoline
- Voltage:
- 12V
- Max. Heat Output:
- 6,800 BTU (2 kW)
- Fuel consumption:
- 0.03 - 0.07 gal/h (0.14 – 0.26 l/h)
- Power consumption:
- 6 - 26W
- External Dimentions:
- 12.2 x 4.5 x 4.8 in (310 x 115 x 122mm)
- Heater model:
- Airtronic S3
- Max. Altitude:
- 13,120 ft (4,000 m)
Included in the kit:
Quiet, Gasoline 12V Heat for RAM ProMaster Van Builds
Warm your ProMaster quickly and sleep comfortably with low power draw and clean, dry heat. The Airtronic S3 B2L produces 6,800 BTU (2.0 kW) and pairs with the EasyStart Pro for simple, reliable control all year round.
Benefits & Use Cases
This gasoline 12V heater is purpose-built for ProMaster conversions and small RVs where space is tight and battery life matters. Enjoy fast warm-ups, steady overnight comfort, and quiet operation without idling.
- Efficient cabin heating on gasoline builds — no diesel tank required
- Low electrical draw (6–26 W) protects your house batteries off-grid
- Automatic altitude capability up to 13,120 ft (4,000 m) for mountain trips
- Compact body for flexible placement in van conversions and campers
Technical
- Fuel: Gasoline
- Voltage: 12V
- Max Heat Output: 6,800 BTU (2.0 kW)
- Fuel Consumption: 0.03–0.07 gal/h (0.14–0.26 l/h)
- Power Consumption: 6–26 W
- Max Altitude: 13,120 ft (4,000 m)
- Warranty: 2 years
- Dimensions (heater body): 12.2 × 4.5 × 4.8 in (310 × 115 × 122 mm)
- Certifications: ECE R122 (heating) & ECE R10 (EMC)
Vehicle Compatibility
- RAM ProMaster (adapter for aux fuel tap included)
- Van conversions & camper builds — weekenders or full-time travel
- RVs & small motorhomes — quiet, efficient off-grid heat
- Truck sleepers & long-haul fleets — warm cabins without idling
- Construction, agricultural & industrial vehicles — cab heat during downtime
- Utility & emergency service vehicles — dependable heat on duty
- Electric & hybrid vehicles — efficient auxiliary heating solution
Not suitable for diesel applications or marine use.
Kit Includes
- AS3 B2L 12V Gasoline Heater
- EasyStart Pro Controller
- Fuel pump (12v)
- Fuel hose
- Exhaust Silencer / Muffler
- Electrical harnesses - Plug n' Play
- Combustion intake pipe 1 meter
- Flexible ducting (60 mm. diameter) - 0.5 meter / 1.64 ft
- Inlet / Outlet grills - Adjustable FLAT, 45 degree 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)
The kit additionally includes the following:
- Specific RAM ProMaster Adapter for aux tap
- Pro controller extension 9.8 ft (3m)
- Floor mounting plate
- Stainless steel exhaust system - approx. 6.6 ft (2m)
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.
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