Espar Airtronic D6L Marine Diesel Heater Kit - 20,500 BTU

Reliable Diesel Cabin Heating for Canadian Waters

The Espar Airtronic D6L marine diesel heater is purpose-built for boaters who refuse to let cold weather cut their season short. Whether you're cruising the Pacific coast in late autumn, navigating the Great Lakes into November, or living aboard in a Maritime harbour, the D6L provides consistent, controllable warmth below deck. Drawing fuel directly from your main diesel tank — or from a small auxiliary tank on gasoline-powered vessels — this heater operates independently of your engine, so you can stay warm at anchor, on a mooring, or tied up at the dock.

Eberspaecher (formerly marketed as Espar in North America) has been producing marine heating systems for over 40 years, and the Airtronic D6L reflects decades of refinement. It is compact enough for installation in a cockpit locker or engine compartment, yet powerful enough to heat the full interior of a large cruising vessel.

Four Output Levels for Precise Comfort

Not every night on the water calls for full blast. The Airtronic D6L offers four distinct thermal output settings, letting you dial in exactly the right amount of heat for conditions:

• Low — approximately 4,100 BTU for mild evenings or maintaining background warmth
• Medium and high intermediate settings for moderate cold
• Boost — up to 20,400 BTU for the coldest conditions or rapid cabin warm-up

Complete Kit — Everything You Need for Installation

The D6L kit is designed to minimise the parts-hunting that often accompanies marine heater projects. Inside the box you'll find the heater unit itself along with all the essential components for a professional-grade installation:

• Espar Airtronic D6L heater unit
• Fuel metering pump and fuel hose
• Electrical harness
• Stainless steel exhaust pipe (900 mm)
• Combustion intake pipe (1 metre)
• Flexible ducting — 90 mm O.D. x 0.5 m
• Inlet and outlet grills
• Air outlet grill (90 mm diameter)
• Screws, clips, and plastic straps

Warranty and Support

Every Eberspaecher Airtronic D6L heater is backed by a two-year, 2,000-hour parts and labour warranty. An international network of distributors and dealers ensures prompt service wherever your cruising takes you. Binnacle.com also offers a 30-day money-back guarantee — you may return your purchase with a return authorisation number within 30 days for a full refund of the purchase price.
 

Specifications

• Heat Output: 20,500 BTU
• Power Output: 5 kW – 6 kW
• Low Heat Output: 4,100 BTU
• Boost Heat Output: 20,400 BTU
• Power Consumption: 6 W – 90 W
• Operating Voltage: 12 volt
• Fuel Type: Diesel
• Weight: 15.4 lbs
• Stainless Exhaust Pipe Length: 900 mm
• Combustion Intake Pipe Length: 1 metre
• Flexible Ducting: 90 mm O.D. x 0.5 m
• Air Outlet Grill Diameter: 90 mm
• Suitable Sailboat Length: 39 – 49 feet
• Suitable Powerboat Length: 32 – 42 feet
• Warranty: 2 years / 2,000 hours, parts and labour

Key Features Summary

• Four selectable output levels — adjust from gentle background warmth to full 20,400 BTU boost to match changing conditions
• Complete installation kit — includes heater, fuel pump, exhaust, ducting, harness, and hardware so you can plan your install without sourcing extra parts
• Engine-independent operation — heats your cabin at anchor, on a mooring, or dockside without running the main engine
• Compact form factor — fits into cockpit lockers and engine compartments on both sail and power vessels
• Draws fuel from your existing diesel tank — no need for a separate fuel supply on diesel-powered boats
• Discreet cabin integration — only small outlet grills are visible in living spaces, preserving your interior aesthetics
• Creates drying compartments — natural heat loss from ducting through lockers keeps gear and clothing dry
• Low electrical demand — balanced design maximises heat output while minimising battery draw for extended off-grid use
• Proven marine heritage — over 40 years of successful installations backed by Eberspaecher's 160-year engineering legacy
• International dealer network — certified service and support available across Canada and worldwide