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👉 Check Latest PriceEberspacher Boat Heater with AS3 D2L Airtronic 12v Airtronic Heater & Twin Outlet. A compact, quiet and economical heater. The Eberspacher S3 D2 Airtronic offers optimised fuel efficiency, a range of operation modes and unsurpassed safety standards. The included Easystart Pro controller allows timed programming and thermostatic heat control, keeping you warm, dry and comfortable when you most need it. Programmable independent heating (does not use heat from the engine) for all types of Marine use. Certified for safe installation in passenger areas and in proximity to dangerous substances. This Airtonic S3 D2L Marine heater includes a complete installation kit to install into your vessel.