12V diesel heaters for cars, vans, campers, RVs, boats and North American trucks with 12V electrical systems. Karlesk 12V models range from compact 2.5 kW heaters for small cabins to 5 kW heaters for full-size vans and sleeper cabs, plus portable all-in-one units.

Once running, a diesel heater draws little battery power and keeps the space warm overnight without idling the engine.