Diesel Heater vs Propane Heater: Which Is Better for Van Life?
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Choosing a heater is one of the bigger decisions in a van build. Get it wrong and you're cold, burning through money, or managing a safety risk every night you sleep in the van.
Diesel and propane both work. They suit different builds, and the honest answer depends on how you travel, where you travel, and what your electrical system looks like.
Here's the comparison with real numbers, including the one most articles get wrong.
Quick Answer
Choose a diesel heater if you sleep in the van in cold weather, want sealed combustion with no carbon monoxide in the living space, and want dry heat that doesn't add condensation to your build.
Choose propane if you already run propane for cooking, want the lowest upfront cost, travel in mild climates, or have no 12 V power to spare.
On running cost: at today's fuel prices, propane is usually the cheaper one to run. More on that below, because it's the opposite of what most comparisons claim.
Side-by-Side Comparison
| Diesel heater | Propane heater | |
|---|---|---|
| Fuel | Diesel, from the van's tank or an auxiliary tank | Propane bottles or a fixed tank |
| Upfront cost | Higher — a complete kit | Lower — often a few hundred dollars |
| Running cost | Higher per hour of heat at current prices | Usually lower, unless you use tank exchange |
| Installation | Half a day to a day — fuel line, exhaust, intake, 12 V | An hour — regulator and hose |
| Combustion | Sealed — intake and exhaust both outside the van | Inside the living space on most models |
| Carbon monoxide risk | None from the heater itself when correctly installed | Real — permanent ventilation required |
| Moisture | Dry heat | Adds water vapour to the van |
| Cold weather | Unaffected by cold; fuel is pumped as a liquid | Output drops below about –10°C |
| Power draw | Continuous 12 V needed (see below) | Many models run with no power at all |
| Fuel availability | Every fuel station | Patchy in remote areas |
| Refuelling | Same tank as the van | Swap or refill bottles |
Running Cost: The Honest Numbers
Most comparisons claim diesel is cheaper to run. That was easier to argue when diesel sat near $1.70 a litre. In October 2026, Vancouver diesel runs around $2.80 a litre, with the national average near $2.60.
Work it through by heat delivered rather than by fuel volume:
| Energy per litre | Useful heat | At current prices | Cost per 10,000 BTU | |
|---|---|---|---|---|
| Diesel | ~34,100 BTU | ~90% (quality heater) | $2.80/L | ~$0.91 |
| Propane | ~21,600 BTU | ~100% into the space | $1.00/L (BC refill) | ~$0.47 |
In practice, a 2 kW diesel heater on a medium setting burns roughly 0.18 L/h, about $0.50 an hour, or $4 for an eight-hour night. A propane heater producing the same heat uses about 0.23 L/h, roughly $0.23 an hour, or under $2 a night at refill prices.
The exception is tank exchange. Swap programs charge $25–30 for a partly filled bottle, which works out near $1.84 a litre, and at that rate the two are about even. If you refill rather than exchange, propane keeps its edge.
So why does anyone choose diesel? Because the reasons below have nothing to do with fuel cost. The difference between the two on a winter's night is a couple of dollars. Where they genuinely differ is safety, reliability in cold, and what the heat does to the inside of your van.
Safety: Diesel Is Safer to Sleep With
This is the strongest argument for diesel, and it holds regardless of fuel prices.
A diesel air heater uses sealed combustion. It draws combustion air from outside through its own intake, burns the fuel in a sealed chamber, and pushes exhaust back outside through a separate pipe. The air it blows into the van is heated across a heat exchanger and never mixes with the exhaust. No combustion gases enter the living space.
Most propane heaters burn inside the living space. They consume the van's oxygen and release combustion products, including carbon monoxide, into the space you're sleeping in. Catalytic models produce less than open-flame ones, but they still require permanent ventilation, which means a window or vent open all night in winter.
Propane also releases water vapour — roughly a litre and a half of water for every litre of propane burned. In a sealed, insulated van in winter, that water condenses on cold surfaces and ends up behind your panels. Damp, mould and rusting metal are a slower problem than carbon monoxide, but they'll wreck a build.
A diesel heater gives dry heat with the windows closed. For anyone sleeping in the van regularly in winter, that's usually the deciding factor.
Whichever you choose, fit a working carbon monoxide alarm. A diesel heater with a cracked exhaust or a badly routed pipe can still put exhaust where it shouldn't be.
Cold Weather: Diesel Is More Reliable
Propane has a physical limitation in the cold. It has to vaporise inside the bottle to reach the burner, and as the temperature drops the pressure falls with it. Below about –10°C to –15°C output noticeably weakens, and below –20°C a standard bottle becomes unreliable, exactly when you need the heat most.
Diesel doesn't have this problem, because the fuel is pumped as a liquid and burned on demand. Cold affects the fuel itself — winter-grade diesel matters, since summer diesel can gel — but output doesn't fall away as the temperature drops.
If you travel in Canada, the northern US, or at elevation in winter, this is the difference between a heater that works at 3 a.m. at –25°C and one that doesn't.
Power Draw: Propane Wins
A diesel heater needs 12 V power the whole time it's running, for the fuel pump, the blower and the control unit. Real figures from our spec sheets:
| Model | Output | Continuous draw (12 V) |
|---|---|---|
| BISON 2000A | 0.9–2 kW | 1.2–2.4 A (14–29 W) |
| BISON 2200A | 0.85–2.2 kW | 0.58–2.83 A (7–34 W) |
| BISON 5000A | up to 5 kW | up to about 95 W |
Startup is the heavy part. The glow pin draws 8–12 A for the first 30–60 seconds of every ignition cycle. It's brief, but your battery and wiring have to handle it, and a weak battery is the most common cause of startup faults.
Over an eight-hour night, a 2 kW heater uses roughly 15–25 Ah. That's comfortable for most van builds with a lithium bank, and demanding for a small lead-acid setup in winter when solar input is low.
Many propane heaters need no electricity at all. For an off-grid build with minimal electrical capacity, that's a genuine advantage.
Installation: Propane Is Simpler
Propane wins here and it isn't close. A portable propane heater connects to a bottle with a regulator and hose, with no drilling.
A diesel heater install involves:
- A fuel line from the van's tank or an auxiliary fuel tank
- An exhaust pipe routed outside through the floor or a body panel
- A combustion air intake, also routed outside
- A 12 V supply with the correct fuse and cable size
Budget half a day to a full day, more if it's your first. The exhaust and intake routing matters most: get them wrong and you can draw exhaust back into the intake or into the van.
It's a one-time job, though. Once it's in, you fill up at any diesel station and run it. And if you'd rather not drill your own van, our dealers across Canada and the US do these installs regularly.
Fuel Availability
Diesel is at every fuel station in Canada and the US, including remote highway stops. If your van runs diesel, there's no separate fuel errand at all.
Propane is easy to find in towns and cities, and harder in remote areas, national parks and small communities. Running out on a cold night somewhere remote is a real risk for full-timers, and bottles have to be carried, swapped and stored.
Who Should Choose Each
A diesel heater suits you if:
- You sleep in the van in winter and want to close the windows
- You travel in Canada, the mountains or the northern US
- You want dry heat and no condensation added to the build
- Your van runs on diesel already
- You want set-and-forget overnight heating on a thermostat
- You have the electrical capacity for a continuous 12 V load
A propane heater suits you if:
- You're a weekend or part-time user
- You already run propane for cooking
- You want the lowest upfront cost and the simplest install
- You travel in mild climates
- You have little or no 12 V power available
The Honest Summary
Propane is cheaper to buy, cheaper to install and, at today's prices, usually cheaper to run. Those are real advantages and it would be dishonest to pretend otherwise.
Diesel wins on the things that matter when you're actually sleeping in a van in winter: sealed combustion with no combustion gases in your space, dry heat instead of condensation, reliable output at –25°C, no bottles to swap, and the same fuel the van already runs on.
If you're van-camping in summer and shoulder season, propane does the job. If you're living in the van through a Canadian winter, the few dollars a night difference in fuel cost is not what you'll be thinking about at 3 a.m.
Frequently Asked Questions
Is a diesel heater cheaper to run than propane?
Not at current prices. Diesel around $2.80/L works out near $0.91 per 10,000 BTU of delivered heat, while propane at BC refill prices of about $1.00/L comes to roughly $0.47. Propane loses its advantage if you use tank exchange instead of refilling, where the two are about even. Diesel's advantages are safety, cold-weather reliability and dry heat rather than fuel cost.
Is it safe to run a propane heater in a van overnight?
Only with permanent ventilation and a working carbon monoxide alarm. Most propane heaters burn inside the living space, consuming oxygen and releasing combustion products including carbon monoxide. A diesel air heater uses sealed combustion, so the burned air stays outside the van.
How much power does a diesel heater use in a van?
Continuously, from about 7 W to 34 W on the BISON 2000A and 2200A, and up to roughly 95 W on larger units, depending on the setting. Startup is the demanding part: the glow pin pulls 8–12 A for 30–60 seconds each time the heater ignites. Over an eight-hour night a 2 kW heater typically uses 15–25 Ah.
Does a propane heater cause condensation in a van?
Yes. Burning propane releases water vapour, roughly a litre and a half of water per litre of propane. In an insulated van in winter that water condenses on cold surfaces and can lead to damp and mould. Diesel air heaters exhaust their combustion products outside, so the heat they deliver is dry.
What size diesel heater do I need for a van?
A 2 kW unit heats most van conversions comfortably. Bigger isn't better: an oversized heater reaches temperature and shuts down before completing a clean burn cycle, which builds carbon on the burner and glow pin and shortens the heater's life.
Will a diesel heater work in extreme cold?
Yes. Fuel is pumped as a liquid, so output doesn't drop with the temperature the way propane does. Use winter-grade diesel, since summer diesel can gel in extreme cold and starve the heater.
Heating Your Van Build?
Our team can help you size a heater for your van and plan the install. Call 1-800-517-7740 (Mon–Fri, 9 AM–5 PM PT) or email info@generalcomponents.ca.
- BISON 2000A Heater Kit — 2 kW, suits most van conversions
- BISON 2200A Heater Kit — 2.2 kW, a little more output for a larger or colder build
- Browse all BISON heaters · Heater parts · Find a dealer
Prices and specifications are current as of publication. Fuel prices quoted are BC retail averages from October 2026 and will vary by region and over time.
