Autoterm Boat Diesel Heater 4kW Large Marine Kit (4 Vent)

AUTOTERM Air 4D 4kW Large Marine Diesel Heater Kit

NOW Includes a FREE Super Quiet Fuel Pump & Carbon Monoxide Alarm

Every AUTOTERM Air 4D Marine Heater Kit now includes a FREE Super Quiet Fuel Pump and FREE Carbon Monoxide Alarm, providing quieter operation and added peace of mind on board.

Designed for boats & yachts up to 48ft (15m)

The AUTOTERM Air 4D Marine Kit is a complete marine heating solution designed specifically for boats and yachts up to 48ft (15m) in length.

Whether you're extending your boating season or keeping your cabin warm and dry during colder months, this marine diesel heater delivers reliable, efficient air heating while helping to reduce condensation and humidity.

Its brushless induction motor ensures exceptionally quiet operation, making it ideal for overnight use with minimal disturbance.

Extend your sailing season—right through to the first frost.

Certified Quality

AUTOTERM heaters are:

• CE Marked

• Manufactured to ISO 9001:2015 standards

• Approved to E2 R10 and E2 R122 regulations

Maximise Your Heating Performance

Independent testing has shown that up to 40% of a heater's heat output can be lost through uninsulated ducting.

For the best heating performance, we recommend insulating your ducting to minimise heat loss and maximise efficiency.

Technical Specifications

• Heating Output: 4kW

• Fuel Type: Diesel

• Voltage: 12V / 24V

• Heated Air Volume: 70–168m³/h

• Power Consumption: 10W–57W

• Fuel Consumption: 0.12–0.51 litres/hour

• Weight: 25.5kg

• Heater Dimensions: 402 × 157 × 188mm

Large Marine Installation Kit Includes

Heater Kit

• AUTOTERM Air 4D diesel heater

• FREE Super Quiet fuel pump

• FREE Carbon Monoxide Alarm

• Stainless Steel 316 mounting bracket

• Stainless Steel 316 through-hull skin fitting

• 1m exhaust pipe with silencer

• Fuel dip tube and fuel line

• Power cable with integrated fuse box

• 4m control panel cable (upgrade options available)

• Fuel pump power cable

• Air intake silencer

• Exhaust heat lagging

• External temperature sensor (5m)

• Selection of nuts, bolts and installation fixings

Marine Ducting Components

• 1 × 90mm T-piece (90°)

• 2 × 90mm Y-pieces (45°)

• 4 × 90mm flanges

• 1 × 90mm closable air vent

• 3 × 90mm air vents

• 1 × 96mm to 90mm air duct adaptor

Why Choose AUTOTERM?

• FREE Super Quiet Fuel Pump

• FREE Carbon Monoxide Alarm

• Premium European engineering

• CE Marked

• ISO 9001:2015 certified

• E2 R10 & E2 R122 approved

• Quiet brushless induction motor

• Low fuel and power consumption

• Compact, space-saving installation

• Simple to operate

• 3-year manufacturer's warranty

• UK-based technical support available 7 days a week

• Excellent after-sales customer service

FAQ

Is this boat diesel heater suitable for my vessel?

This kit is designed for boats and yachts up to 48ft (15m), making it a strong choice for cabins, liveaboards, and larger marine installations.

Does the kit include ducting components?

Yes, the large marine installation kit includes 4 vent ducting components, fittings, and air vents for a complete setup.

Will it help reduce condensation onboard?

Yes, the AUTOTERM Air 4D helps keep the cabin warm and dry, which can reduce condensation and humidity.

Can I improve heating performance?

Yes, insulating the ducting is recommended to minimise heat loss and maximise efficiency.

Is the heater quiet enough for overnight use?

Yes, the brushless induction motor and super quiet fuel pump help reduce noise for more comfortable overnight use.

Please Note

Product images are for illustration purposes only. Components may occasionally be substituted with equivalent parts of equal or higher quality without prior notice.