1400 – 4500 W
4,700 – 15,300 BTU

Wallas Spartan Air marine heater

Powerful 12 V Diesel Heater

Spartan Air offers the latest remote control features in the marine heater market, which makes it convenient for everyone to use. The Advanced Control Panel can be accessed remotely with a mobile app, which enables you to turn the heater on even from the comfort of your home. Wireless sensor monitors the indoor temperature with better accuracy and maintains a smooth temperature.  

When you narrow down the best option for you, an important feature to consider is Spartan Air is equipped with three inlets. In comparison, Spartan Twin has two, and many other heaters in the market only have one. Multiple inlet pipes result in better efficiency and fresher air indoors. Both Spartan Series models are energy-efficient 4.5 Kw heaters – good options for medium-sized boats up to 12 m/40 ft. 

Three Inlets and Outlets Improve Airflow and Efficiency

Three inlets take fresh air from outside and recirculate heated air in the cabin. This improves efficiency and ensures oxygen rich air in the cabin. 

Three outlets reduce air drag and keep the sound level low. They also reduce power consumption and facilitate smooth distribution of heated air throughout the cabin. The bigger the cross-sectional area of the ducts are, the less it reducts the airflow and does not require more power from the ventilation fan. 

The Advanced Control Panel Gives You All the Info You Need with One Glance

Use heater in Thermostatic Mode to set a target temperature or switch to Manual Mode and control heat with six power levels (1-6).

Blow fresh air with Ventilation Mode when heating is not needed.

Superior ventilation volume in Air Boost Mode provides extremely fast defrosting and drying – The highest in its class!

Switch to High Altitude Mode  when traveling in high altitudes to adjust the combustion.

Wallas Mobile App for Remote Access

Turn your heater on remotely with the Wallas Remote App and enjoy a warm boat upon arrival.

Monitor cabin temperature and battery voltage remotely from home to be better prepared for the day.

Adjust temperature locally on boat with your phone without having to reach to the control panel.

Keep your heater always updated with the latest features.


Open and closable air vents can be installed in the indoor space or on the deck for maximum comfort.


Wireless sensor sends more accurate temperature data to the control panel to maintain a smooth ambient temperature.


Fully enclosed laminar burning process does not leak odors into the cabin and dries the indoor air.


Brushless blower motors have a very long life-cycle, supporting reliably long service intervals.



Cleaner Burning

Updated software optimizes fuel consumption

Calibrated to burn renewable fossil free diesel (e.g. HVO)

Larger burner burns fuel slower resulting in ultra low NOX emissions

Extensively tested with Neste

Improved burner efficiency for more power

The Greenboost burner burns renewable fossil-free diesel cleanly and energy-efficiently in addition to fossil based diesel fuels

Three inlets improve fresh airflow and efficiency

Combustion air is taken from outside the boat through the outer coaxial pipe

Exhaust gas is safely expelled outside through the inner coaxial pipe keeping the indoor air clean and odourless

Fully enclosed laminar burning process ensures a quiet sound level and a stable, wind resistant burn

Energy-efficient Wallas Greenboost technology saves fuel and electricity

Variable output eliminates system cycling and reduces noise

Brushless blower motor has a longer life-cycle and requires less frequent servicing

Feeding fuel directly from the main tank of the vessel saves space and eliminates the need for a separate tank

Durable Finnish design and manufacturing keep your heater intact for years

Low temperature on unit and exhaust pipe improves safety

Advanced Control Panel enables intelligent temperature control

Wallas Remote App heater control works locally on boat with no WiFi by using short-range wireless connection

Heater can be accessed from any location through a boat WiFi router with the Wallas App

Wireless sensor monitors cabin temperature with improved accuracy

Remote accessibility enables system updates and diagnostics

Heater can be set up to operate with Yamarin Q-infotainment, Buster Q, and Askeladden C-command screens


Spartan Air power


Wallas Spartan Fuel


Spartan Air electricity


Fuel: Diesel, HVO renewable diesel
Power: 1400-4500 W (4,700-15,300 BTU)
Operating Voltage: 12 V
Fuel Consumption: 0,16-0,46 l/h (5.4-15.5 oz/h)
Electricity Consumption: 0,7-4,5 A
Air Volume at min Heat: 102 m3/h (60 cfm)
Air Volume at max Heat: 227 m3/h (133 cfm)
Length: 424 mm (16 11/16″)
Width: 165 mm (6 1/2″)
Height: 278 mm (10 15/16″)
Weight: 15 kg (33 lbs)
Mounting: Floor or wall


Boats: 9-12 m (29-40 ft)
Large Motorhomes (retrofitted): Ask your dealer
Trailers: up to 8 m (26 ft)


Advanced Control Panel, wire 5 m (16.4 ft)
Wired and wireless thermo sensors
Fuel line 4 m (13 ft)
Power cable 4 m (13 ft) with connector and integrated fuse 15 A
Mounting plate, feet brackets
Accessory bag including essential clamps and screws


Stainless Steel, High-Grade Aluminum, Other Corrosion-Resistant Materials

Recommended builds should be used as general guidelines. The needed heat output is based largely on the material (wood, fiberglass, aluminum etc.) and structure of the boat. Always discuss this with a Wallas distributor, before making your purchase. 

Technical values are measured in a reference measurement wall, which is constructed to respond to a typical boat installation. Values have been measured with maximum length of ducting, exhaust pipe, fuel line, and power cord. The figures allow for 10 % reserve – yours may vary.

Wallas diesel heaters are designed to run with standard road and boat diesel, as well as renewable fossil free diesel. Check with your distributor for further details on best options for your needs.

Wallas Spartan Air tarvikkeet

Accessories in black are included in the standard package. Accessories in blue are additional. 

Browse product manuals, spec sheets and more in the Documents Center

Are You Unsure if Spartan is Enough?

Reach out to your dealer to discuss different installation options to see how to get the most of your Spartan and ensure you get what you need.