Compact and Efficient Marine Heating Solution
The Airtronic S3 D2L 12V 2 outlet marine heater kit is the ideal solution for boat owners looking for warmth in any climate.
With an impressive 2.2kW (7,500 BTU) output, this Espar marine heater kit is powerful enough to heat up your cabin while remaining energy-efficient and compact.
Marine Diesel Heater Kit Built for Harsh Conditions
This marine diesel heater kit is made for extreme environments, functioning reliably in temperatures as low as -51°F and altitudes up to 13,120 feet
With automatic altitude adjustment and a brushless motor for quiet operation, you'll be able to enjoy quiet, comfortable heating even in the harshest marine conditions. Thanks to the German-made parts, the unit will remain reliable for up to 5,000 operational hours.
EasyStart Pro Controller for Precise Climate Control
Control your environment with exceptional accuracy using the EasyStart Pro controller. This advanced digital system allows users to schedule heater operation, view system diagnostics, and adjust temperature settings with ease.
An integrated thermostat helps maintain optimal comfort levels, while its compatibility with the latest AS3 communication system provides on-screen fault diagnostics for easy troubleshooting.
Smart Design for Simple Installation
The Airtronic S3 D2L kit is designed to minimize setup time. The plug-and-play system comes with pre-configured wiring and marine-grade components, including a fuel metering pump, stainless steel exhaust, combustion air silencer, and more.
With an existing fuel line, you don't need additional equipment, which saves time and simplifies installation in tight spaces.
Dual Outlet Heating for Balanced Airflow
Equipped with two 60mm hot air outlets, this heater kit delivers balanced airflow throughout your vessel. The package includes almost 20ft of ducting, a Y-branch, closeable outlets, clamps, and all necessary mounting hardware.
The system is designed for airflow efficiency and customizable installation, so the heat is evenly distributed in cabins, salons, or sleeping quarters.

Kit Includes
- Airtronic S3 D2L 12V heater unit. 3rd generation AS3 Airtronic
- EasyStart Pro Timer (with integrated temperature sensor)
- 6m / 19.7ft of ducting (90mm diameter)
- Y-branch (60mm)
- 60mm outlet with fitting x 1
- 60mm closeable outlet with fitting x 2
- 6 metal clamps for air duct
- Fuel Metering Pump with marine grade fuel line
- Wiring harness
- Stainless steel exhaust hull skin fitting (ID 30mm)
- 30mm ID Exhaust hose with silencer / muffler and marine grade insulation + hard cover on top 2 m / 6.56 ft
- Exhaust adapter (24-30mm) with water with drain coil
- Stainless steel heater mounting bracket - L shape
- Combustion air silencer / muffler
- Fuel Standpipe (600mm)
- Screws, clips, clamps and other fixings required for installation
Technical Specifications:
- Fuel: Diesel
- Voltage: 12V
- Heat Output: 2200W (7500 BTU)
- Fuel Consumption: 0.02 - 0.1 gal/h (0.06 - 0.28 l/h)
- Power Consumption: 6 - 31W
- External Dimensions: 12.2 x 4.5 x 4.8in (310 x 115 x 122mm)
- Power output: 2kW
- Warranty: 2 years
Technical Specifications of the Espar Airtronic S3 D2L 12V 2 Outlet Marine Diesel Heater Kit with EasyStart Pro Controller
- Fuel:
- Diesel
- Voltage:
- 12V
- Heater model:
- Airtronic D2 / B2
- Power output:
- 2kW
Included in the kit:
Compact and Efficient Marine Heating Solution
The Airtronic S3 D2L 12V 2 outlet marine heater kit is the ideal solution for boat owners looking for warmth in any climate.
With an impressive 2.2kW (7,500 BTU) output, this Espar marine heater kit is powerful enough to heat up your cabin while remaining energy-efficient and compact.
Marine Diesel Heater Kit Built for Harsh Conditions
This marine diesel heater kit is made for extreme environments, functioning reliably in temperatures as low as -51°F and altitudes up to 13,120 feet
With automatic altitude adjustment and a brushless motor for quiet operation, you'll be able to enjoy quiet, comfortable heating even in the harshest marine conditions. Thanks to the German-made parts, the unit will remain reliable for up to 5,000 operational hours.
EasyStart Pro Controller for Precise Climate Control
Control your environment with exceptional accuracy using the EasyStart Pro controller. This advanced digital system allows users to schedule heater operation, view system diagnostics, and adjust temperature settings with ease.
An integrated thermostat helps maintain optimal comfort levels, while its compatibility with the latest AS3 communication system provides on-screen fault diagnostics for easy troubleshooting.
Smart Design for Simple Installation
The Airtronic S3 D2L kit is designed to minimize setup time. The plug-and-play system comes with pre-configured wiring and marine-grade components, including a fuel metering pump, stainless steel exhaust, combustion air silencer, and more.
With an existing fuel line, you don't need additional equipment, which saves time and simplifies installation in tight spaces.
Dual Outlet Heating for Balanced Airflow
Equipped with two 60mm hot air outlets, this heater kit delivers balanced airflow throughout your vessel. The package includes almost 20ft of ducting, a Y-branch, closeable outlets, clamps, and all necessary mounting hardware.
The system is designed for airflow efficiency and customizable installation, so the heat is evenly distributed in cabins, salons, or sleeping quarters.

Kit Includes
- Airtronic S3 D2L 12V heater unit. 3rd generation AS3 Airtronic
- EasyStart Pro Timer (with integrated temperature sensor)
- 6m / 19.7ft of ducting (90mm diameter)
- Y-branch (60mm)
- 60mm outlet with fitting x 1
- 60mm closeable outlet with fitting x 2
- 6 metal clamps for air duct
- Fuel Metering Pump with marine grade fuel line
- Wiring harness
- Stainless steel exhaust hull skin fitting (ID 30mm)
- 30mm ID Exhaust hose with silencer / muffler and marine grade insulation + hard cover on top 2 m / 6.56 ft
- Exhaust adapter (24-30mm) with water with drain coil
- Stainless steel heater mounting bracket - L shape
- Combustion air silencer / muffler
- Fuel Standpipe (600mm)
- Screws, clips, clamps and other fixings required for installation
Technical Specifications:
- Fuel: Diesel
- Voltage: 12V
- Heat Output: 2200W (7500 BTU)
- Fuel Consumption: 0.02 - 0.1 gal/h (0.06 - 0.28 l/h)
- Power Consumption: 6 - 31W
- External Dimensions: 12.2 x 4.5 x 4.8in (310 x 115 x 122mm)
- Power output: 2kW
- Warranty: 2 years
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 - 1 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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