Both diesel and propane heaters are proven choices for van life — this isn't a "one is wrong" comparison, it's about which tradeoffs fit your build and travel style.
Quick Comparison
| Diesel (e.g. Webasto, Espar-style) | Propane (e.g. Propex-style) | |
|---|---|---|
| Fuel source | From main fuel tank (diesel vans) or separate tank | Separate propane tank/bottles |
| Fuel efficiency | Very efficient, low fuel use per hour | Less efficient than diesel per BTU |
| Installation complexity | More complex — combustion air intake, exhaust routing, fuel line tap | Simpler — mounts with vent kit |
| Odor during operation | Minimal once running (some smell on startup/shutdown) | Minimal, occasional faint propane smell |
| Cold-start reliability | Can struggle in extreme cold without preheating | Generally reliable in cold |
| Running cost | Lower — diesel is efficient and often cheaper per BTU | Higher — propane costs more per equivalent heat output |
| Safety consideration | Requires correct exhaust routing (CO risk if done wrong) | Requires proper ventilation and CO/propane detection |
Diesel Heaters
Diesel heaters (Webasto, Espar, and increasingly common lower-cost alternatives) are highly fuel-efficient — a full diesel tank can provide many hours or days of heat, and if your van already runs diesel, you may be able to tap the existing fuel tank rather than carrying a separate one. The tradeoff is installation complexity: correct combustion air intake and exhaust routing matter for both performance and safety, and DIY installs need to be done carefully, following manufacturer specs exactly, not approximated.
Best for: builders comfortable with a more involved install (or willing to pay for professional installation), diesel-powered vans wanting to avoid a separate fuel source, and long off-grid stretches where fuel efficiency matters most.
Propane Heaters
Propane heaters (Propex and similar) are generally simpler to install — venting kits are more standardized, and they don't require tapping into the vehicle's fuel system. Propane is also widely available for refill/exchange almost everywhere in North America, which matters for long trips. The tradeoff is lower fuel efficiency per BTU than diesel, meaning more frequent propane refills on long, cold trips, and if you're already carrying propane for cooking, that's one more system drawing from the same fuel source.
Best for: builders prioritizing installation simplicity, gas-powered vans (no diesel tank to tap), and anyone who wants a widely-serviceable fuel source on the road.
Safety Non-Negotiables for Either Option
- Install a working carbon monoxide detector regardless of which heater you choose — this isn't optional for either fuel type.
- Follow exhaust/venting specs exactly — both diesel and propane heaters rely on proper external venting to avoid CO buildup inside the van.
- Don't DIY around manufacturer installation instructions — combustion heaters are one of the few van build components where "close enough" genuinely isn't safe.
What Most Full-Time Winter Vanlifers Actually Choose
Diesel heaters have become the more common choice among full-time, cold-climate van lifers specifically because of fuel efficiency on long off-grid stretches — not needing to carry or find propane refills matters more the longer and more remote the trip. That said, propane remains a completely valid, simpler choice for builders who don't want the added installation complexity or who primarily do shorter trips with easier resupply access.
Frequently Asked Questions
Are diesel heaters safe in a van? Yes, when installed correctly per manufacturer specifications with proper combustion air intake and exhaust routing, plus a working CO detector. Incorrect installation is the actual risk, not the fuel type itself.
Can I install a diesel or propane heater myself? Many builders do, but both require following manufacturer installation specs precisely — this is not an area to improvise on, given the carbon monoxide risk of incorrect venting.
How much propane does a van heater use per night? Varies by heater output and outside temperature, but a typical propane heater might use roughly 0.5-1 lb of propane per hour on a cold night at moderate output — check your specific heater's rated consumption.