If you’re someone who spends a lot of time off-grid or travels in colder regions, adding one of the top 12V heaters for campervans or RVs is one of the smartest upgrades you can make.
These compact and efficient units run off your vehicle’s power supply and are specifically designed for mobile living, making cold nights much more manageable.
Unlike standard AC heaters that need shore power or noisy generators, 12-volt models are powered by your DC battery system. This makes them ideal for remote camping where access to electricity is limited.
Whether you’re parked in a quiet forest or camping high in the mountains, a good 12V heater can offer reliable warmth without hassle or breaking down and not working.
One standout in 2025 is the EF ECOFLOW Wave 2, a dual-function heating and cooling unit offering excellent portability and silent operation.
While its premium pricing might give some pause, the added convenience of all-season functionality justifies the investment for serious travelers.
Best 12V Heaters: Design & Key Models
EF ECOFLOW Wave 2
With 5100 BTU cooling and 6100 BTU heating power, this unit handles spaces up to 500 sq. ft. It offers four charging methods (AC, car, solar, power station), a swappable battery, and runs quietly at 44 dB in sleep mode. Great for those seeking portability and dual-use performance.
VEVOR Diesel Heater
Ideal for harsh climates, this diesel heater is built to run clean and quiet with fast heat-up times. Perfect for RVs, boats, and remote cabins. Installation is straightforward, and it performs reliably in extreme cold.
Wayska Diesel 12V Heater
Built for high-altitude use (up to 5500m), this unit includes a muffler for quieter performance and efficient fuel usage (0.2–0.5 L/hr). It’s dependable, compact, and eco-friendly with low emissions.
maXpeedingrods 12V 8KW Heater
One of the most powerful units available, offering fast heat, low fuel consumption, and remote control operation. Rugged and suitable for large vehicles or extended stays in cold environments.
Extreme Winter Camping: Top 12V Heaters for Campervans & RVs
From our testing during winter camping, the Wayska Diesel Heater 12V is the top choice for high-altitude, extreme cold environments.
It’s designed to function reliably at elevations over 5500 meters, thanks to its altitude-compensation features.
This model includes a muffler and blower speed control to reduce noise and manage power consumption efficiently in thinner air.
Its fuel efficiency and rugged construction make it ideal for serious winter campers staying in remote or mountainous regions.
What We Learned About Choosing a 12V Heater for Your Camper?
- Off-grid capability: Perfect for dispersed camping or sites with limited power access.
- Low energy use: Efficient design draws 8–14 amps/hour, ideal for battery-based systems.
- Compact and easy to install: Many models plug directly into 12V outlets or include mounting kits.
- Safe and emission-conscious: Most are designed for safe indoor use with low exhaust.
Types of 12V Heaters
- Fan-forced: Uses a coil and fan to circulate warm air.
- Ceramic: Heats ceramic plates to radiate warmth evenly.
- Diesel: Burns fuel for powerful heating in extreme conditions.
Each has its benefits – choose based on your climate, vehicle size, and power availability.
What Were the Results of Diesel Fuel Efficiency Compared to Solar-Charged Battery Options?
Diesel heaters are more fuel-efficient over longer periods and can provide continuous heat regardless of sunlight availability.
They consume between 0.2-0.6 liters per hour, translating into 8-20 hours of heat on a 5-liter tank. In contrast, solar-charged battery systems depend heavily on sunlight, and battery bank size often limits heater runtime.
While solar power is cleaner and quieter, diesel offers more consistent heating, especially in overcast or cold climates where solar performance drops significantly.
Installing and Venting a Diesel Heater Inside a Small Camper
- Mount the unit externally or in a sealed, ventilated box inside to prevent fumes from entering the living space.
- Route the exhaust pipe directly outside using heat-resistant tubing and ensure it’s clear of doors, windows, or intake vents.
- Use a fuel-safe line and reservoir, and keep all lines sealed and secured.
- Install a CO detector in the cabin for safety monitoring.
- Follow the manufacturer’s manual precisely, and test the unit in an open area before using it inside.
Proper venting and tight seals are essential to prevent carbon monoxide buildup and overheating.
FAQs
What size heater do I need for my camper?
For smaller RVs or vans, a 5KW unit is sufficient. For larger vehicles, consider an 8KW diesel heater or the EcoFlow Wave 2.
Can a 12V heater run all night?
Yes, if your battery system can handle the amp draw. Many models include thermostats to cycle on/off as needed.
Is a diesel heater safe to use indoors?
Yes, as long as it’s properly installed and vented. All combustion occurs in a sealed chamber with exhaust directed outside.
How long will a 12V heater run on a full battery?
Depends on capacity, but typically 6-12 hours on a fully charged deep-cycle battery.
What’s the most efficient heater?
Diesel heaters are the most fuel-efficient for long-term use. For multi-purpose convenience, the EcoFlow Wave 2 is top-tier.