Staying warm during Australia’s cooler months is one of the biggest challenges for year-round caravan travellers. While portable fan heaters and gas setups have their place, diesel heaters have become a popular choice thanks to their efficiency, reliability, and safety when installed correctly. Whether you’re heading into the high country or just trying to take the edge off chilly mornings, knowing how to install a diesel heater in your caravan is a game-changer.
Your choice of layout, available storage, and caravan type will all influence the install. If you’re still in the process of setting up or modifying your van, you’ll find a range of caravans in Heatherbrae where heater installs can be easily accommodated depending on design.
Why Choose a Diesel Heater?
Diesel heaters are efficient, safe when installed properly, and capable of running overnight without draining your battery system. They draw fuel directly from a separate tank or your vehicle’s supply (in motorhomes), and use a 12V connection for ignition and fan power. Most units are thermostat-controlled and can be tucked neatly under beds or seating compartments.
Compared to gas heaters, diesel models offer better safety for enclosed spaces, with fewer risks around carbon monoxide build-up when correctly vented. They also perform well in damp or high-altitude conditions, making them ideal for travelling across Australia’s diverse climates.
What You’ll Need for the Installation
Before diving in, make sure you have the right components. A typical diesel heater kit includes the heater unit, fuel tank, fuel line, pump, control panel, exhaust pipe, air intake hose, clamps, and mounting plates. Most come as complete packages, but check that fittings and brackets suit your van’s construction — particularly the floor thickness and undercarriage clearance.
You’ll also need tools like a hole saw, drill, silicone sealant, screwdrivers, and wire strippers. Many DIY installers recommend sketching out the layout beforehand, especially when space is tight or you’re working around plumbing and electrical systems.
Best Placement for Your Diesel Heater
Choosing the right spot for your heater is one of the most important parts of the job. Most installers go for under-seat compartments, bed bases, or storage cavities where there’s access to the floor for mounting and venting. The heater must be mounted horizontally on a flat surface, and the fuel pump should be placed close by — ideally at a 15–35° incline for reliable operation.
When drilling through the floor, make sure you’re not compromising structural supports or cutting near plumbing or chassis wiring. You’ll need enough clearance underneath the van for the air intake and exhaust hoses, both of which must be shielded from dust and water ingress.
Ventilation, Wiring, and Fuel Setup
Ventilation is a safety priority. Your diesel heater must be correctly vented to the outside using the included exhaust pipe, which should be mounted well clear of doors, windows, or air intakes. Use high-temp silicone to seal the exhaust flange and reduce any risk of leaks or fume seepage. Keep the air intake hose facing down and away from the wheel spray zone.
Wiring should go directly to your 12V system, either from the battery or a dedicated fuse box. Most heaters draw around 10–15W during operation, with a higher draw on startup. Route wires cleanly through cable glands or rubber grommets to prevent chafing.
For the fuel tank, many setups use a dedicated 5–10L tank mounted to the van’s exterior. It should be accessible, secure, and away from high-heat areas. Run the fuel line securely through protective sleeving, avoiding bends or tight kinks. Prime the pump and bleed the line before first startup.
FAQs
Is it legal to install a diesel heater in a caravan in Australia?
Yes, it’s legal — but only if the heater and installation meet Australian safety and compliance standards. Most diesel heater kits sold locally will comply with AS/NZS standards, but imported models (especially cheap ones from overseas marketplaces) may not meet ventilation or emissions requirements. It’s your responsibility to ensure the unit is safe and properly installed. If you’re unsure about compliance, it’s worth getting a licensed gasfitter or RV technician to review the setup, even if you do the install yourself. In caravan parks and powered sites, improper installations can lead to restrictions or even evictions. To stay on the safe side, choose a certified unit and follow all manufacturer guidelines closely during the installation process.
Can I install a diesel heater in a caravan myself?
Yes — many caravan owners install diesel heaters themselves as a DIY project. The key is to follow the manufacturer’s instructions closely and make sure all safety aspects are covered. That includes proper exhaust venting, secure wiring, and correct fuel line installation. While it’s not technically illegal to install it yourself, any faults in the system can be dangerous — especially carbon monoxide leaks or wiring issues that cause shorts. If you’re not confident drilling through your van floor or wiring into your 12V system, you can do a partial install and get a professional to finish or inspect it. Many DIYers use online video guides, but always cross-reference with your unit’s manual — different brands vary slightly in parts and layout.
Where’s the best place to mount a diesel heater in a caravan?
The best location depends on your van’s layout, but most people install diesel heaters under fixed furniture like beds or seats. These areas typically have space for the unit and allow easy access to the floor for intake and exhaust hoses. You’ll need to ensure there’s enough clearance beneath the van to safely mount the venting components and avoid road debris or water ingress. Mount the heater horizontally and keep the fuel pump nearby on a slight incline. Also consider the airflow — placing the heater centrally allows for better warm air distribution throughout the space. Avoid mounting too close to plumbing, gas lines, or electronics. Before cutting anything, double-check what’s beneath the floor to prevent hitting structural supports or key systems.
How much power does a diesel heater use?
Diesel heaters are very efficient, which is one reason they’re so popular among full-time travellers. Most 2kW to 5kW models draw a small amount of power — around 10 to 15 watts during operation. The startup phase uses more power, often around 100 to 150 watts for 3 to 5 minutes, as the glow plug heats up. Once running, the heater sips power steadily to keep the fan and controller going. This makes them ideal for off-grid setups using batteries or solar power. However, if your battery is already low or poorly maintained, even this small draw can drain it overnight. Always monitor your 12V levels and consider using a DC-to-DC charger or solar regulator to keep things topped up. Good quality units will shut down cleanly when voltage drops too low, helping protect your system.
What safety checks should I do after installing a diesel heater?
Once your diesel heater is installed, safety checks are essential. Start by inspecting all fuel lines and clamps to ensure there are no leaks. Check that the exhaust pipe is sealed correctly with high-temperature silicone and that it’s venting safely away from the van. The air intake should be clear and not obstructed by dirt, debris, or water. Next, test the wiring — all connections should be firm, with no exposed wires or signs of heat. Switch the unit on and let it run through a full cycle while monitoring for odd smells, noises, or smoke. Use a carbon monoxide detector inside the van — this is non-negotiable. Even small leaks can be deadly. Finally, double-check that the fuel tank is mounted securely and that there’s enough clearance around all hot components. Take the van for a short drive and reinspect everything after travel vibration.
Installing a diesel heater the right way
Installing a diesel heater in your caravan opens up a world of comfortable winter travel — but only if it’s done properly. A safe, well-planned setup keeps you warm without compromising your power system, air quality, or structural integrity. Whether you tackle it DIY or get help from a professional, it’s a worthwhile upgrade for year-round comfort.
Start your journey with confidence — visit 7th Street Caravans or give our team a call on 02 4012 6009 for friendly, local advice.