The Eberspacher Airtronic D2 Marine Heater is a compact, diesel-powered warmth solution designed for sail and motor boats from 12 to 35 feet. Built for retrofit friendliness and engineered to meet stringent safety standards, this unit delivers dependable cabin heat without relying on your engine, so a comfortable voyage is possible even when the motor stays off.

Engineered for efficient, adaptable boat heating

Whether you’re chasing a pre-dawn chill off the water or wanting to maintain a cozy cabin on a damp evening, the Airtronic D2 offers flexible control andQuiet operation that won’t overpower conversations or radio chatter. It supports fresh-air operation and doubles as a ventilation system on warmer days, helping reduce condensation and maintain air quality throughout the cabin.

Key advantages that matter on the water

• Independent heating (no engine heat required) for all types of marine use
• 12/24V operation with a heat output range from 850W to 2,200W
• Four control states: Low, Medium, High, and Power, plus continuous temperature adjustment
• Quiet operation and minimal electrical draw, preserving battery life
• Minimal assembly required, making it ideal for retrofits
• Maintenance-free and user-friendly, with automatic safety checks managed by the central control unit
• Suitable for fresh-air ventilation on warm days to improve cabin comfort
• Certified for installation in passenger areas and near potentially dangerous substances

What’s included in the Airtronic D2 Marine Heater kit

• D2 unit
• 1 m x 60 mm ducting
• 1 x 60 mm air outlet
• Electrical harness and connections
• Fuel pump, 8 m fuel line and connections
• Stainless steel mounting bracket and hardware
• Exhaust silencer
• 1 m x exhaust pipe and lagging
• 1 m x combustion intake pipe
• Mini controller
• Stainless steel through-hull fitting

Technical specifications at a glance

• Fuel Type: Diesel
• Voltage: 12/24V
• Control / Heat Settings: Low, Medium, High, Power
• Heat Output: Low – 850W, Medium – 1,200W, High – 1,800W, Power – 2,200W
• Air Flow Volume: Low – 40 kg/h, Medium – 60 kg/h, High – 90 kg/h, Power – 105 kg/h
• Electrical Power Consumption: Low – 8W, Medium – 12W, High – 22W, Power – 34W
• Fuel Consumption: Low – 0.10 l/h, Medium – 0.15 l/h, High – 0.23 l/h, Power – 0.28 l/h
• Dimensions: 310 x 115 x 122 mm
• Weight: 2.7 kg
• Applications: Programmable independent heating for all marine and road uses; certified for passenger areas and proximity to hazardous substances

How the Eberspacher AIRTRONIC D2 heater works on board

When the heater receives its starting pulse, the control unit springs into action: an automatic safety check runs, the burner motor starts, and the combustion space is pre-ventilated. The glow plug warms, the metering pump delivers fuel, and the glow plug ignites the fuel-air mixture to form a stable flame. Hot combustion gases pass through the heat exchanger, and a dedicated air fan draws in cabin or fresh air to absorb that heat. The result is a steady stream of warm air that heats the space efficiently and quietly.

Who should consider the Airtronic D2 Marine Heater

Ideal for sailors and boaters who want reliable, independent heating without engine usage, especially in small to mid-sized sail and motor boats. It’s perfect for liveaboards seeking consistent warmth, weekend sailors who want quick comfort after an early departure, and owners retrofitting older boats where space and installation time matter.

Practical use cases and practical tips

• Preheat your cabin on chilly mornings before you head out, without running the engine or generator
• Maintain comfortable living space during long stays at anchor or in marinas with cooler nights
• Run the heater as a ventilation option on hot days to improve air quality and reduce humidity
• Plan retrofits in existing boats with minimal downtime thanks to the compact size and straightforward installation
• Pair with programmable control to schedule heating cycles, aligning warmth with your cruising plan

The Eberspacher Airtronic D2 Marine Heater brings precise warmth, flexible control, and marine-grade safety to your boat. Its compact footprint, low running costs, and retrofit-friendly design make it a thoughtful long-term choice for sailors and boaters who value comfort, reliability, and smarter energy use on the water.