1500 – 5000 W

5100 – 17000 BTU

Spartan Water

The New Reliable Wallas Water Heater Series is Designed for People who Enjoy the Heat and Hot Showers Wherever They Go

New Wallas Spartan Water is a water heating system, which can be used solely for heating domestic fresh water or it can also be used to power up floor and radiator heating. Additionally, Spartan Water can be turned on remotely with the Wallas App even from the comfort of your home, which saves a tremendous amount of time. Spartan Water is an excellent option for other off-grid applications as well, for instance, camper vans, cottages, office/break room containers, or construction trailers.

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

Use heater in PI Thermo Control Mode to set a target temperature or switch.

Summertime mode allows you to heat only the hot shower water system without heating the indoor space, when the weather is nice and warm.

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.

Both heaters come with 5W brushless motor water pump and can run the 15W water pump as well for the longer coolant runs.
Cylinderstat lets you start the heater automatically when you open the water tap or take a shower.
The heaters have also room temperature sensor feature for those who want to see the room temperature in the boat with Wallas bluetooth temp sensors (4432).
Wallas Water heaters have condensating (highest possible efficiency) heat exchanger design. It surpasses other diesel water heater competitors in its category.


Cleaner Burning

Updated software optimizes fuel and electricity consumption

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

Larger burner burns fuel slower resulting in ultra low CO2 and 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 odorless.

Fully enclosed laminar burning process creates heat with no exposed flame and ensures a stable, wind resistant burn.

Energy-efficient Wallas Greenboost technology saves fuel and electricity.

Brushless blower motors have a very long life-cycle and require 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.





Fuel: Diesel, HVO renewable diesel
Power: 1500-5000 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: 0,5-1,2 A
Length: 424 mm (16 11/16″)
Width: 165 mm (6 1/2″)
Height: 309 mm (10 15/16″)
Weight: 15 kg (33 lbs)
Mounting: Floor 
E-mark Approved for Vehicles: Yes


Boats: 9-12 m (29-40 ft)
Camper Vans: MB Sprinter
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 represent 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.

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