Karlesk diesel heaters keep trucks, vans, RVs, boats, garages and off-grid cabins warm with the engine off. Choose a 2.5 kW heater for cars, pickups and compact campers, a 5 kW heater for full-size vans, RVs and truck sleeper cabs, or an all-in-one portable diesel heater for tents, workshops and job sites.

All models run on diesel and use 12V or 24V power. A 5 kW heater burns 0.2–0.45 L of fuel per hour, far less than idling the engine to stay warm.