Diesel Caravan Heater: A Complete Guide Including Domestic and Chinese Brands
This guide compares reference brands like Webasto, Eberspacher (Espar), Autoterm/Planar, and Truma alongside domestic suppliers/brands like Webesten and SUGA, and well-known Chinese-origin brands like Belief, VEVOR, Hcalory, MaXpeedingrods – all at the same table. Figures are compiled from manufacturer technical documents and official regulations. Tables contain no external links; official source links are in the Sources section at the end of the article.
How Does a Diesel Heater Work?
A diesel heater burns diesel fuel in a separate combustion chamber and transfers heat to the cabin air through a heat exchanger. Fuel is supplied by a metering pump; the mixture is ignited by a glow plug and burner. The blower fan sends air passing through the exchanger into the hot-air ducts. Most units run on 12 V (some on 24 V); current draw increases during the ignition/cool-down phases and drops at nominal operation. With proper installation, it provides uninterrupted all-night heating with low fuel and electrical consumption.
When to choose 2 kW?
Sufficient for most climates in compact panel vans/travel trailers; low consumption, quieter, and lighter. More efficient with short, narrow duct layouts.
When to choose 4-6 kW?
If you have a large volume, many vents, windy/harsh winters, or expect fast heat-up, the 4-6 kW class is more suitable; consumption and current draw naturally increase.
Reference (European) Brands – Technical Comparison
| Brand/Model | Heat Output | Fuel (L/hour) | Electrical (W) | Altitude | Note |
|---|---|---|---|---|---|
| Webasto Air Top 2000 STC | 0.9-2.0 kW | 0.12-0.24 | ≈14-29 | Altitude mode depends on kit/ECU | Official values: see Sources |
| Webasto Air Top Evo 40 | 1.5-4.0 kW | ~0.25-0.51 | ≈15-40/55 (boost) | Depends on package | Official values: see Sources |
| Eberspacher Airtronic S2 D2L | ≈0.9-2.2 kW | ≈0.10-0.28 | ≈8-34 | Automatic ≈3000 m | Official values: see Sources |
| Eberspacher Airtronic M2 D4L | ≈1.5-4.0 kW | ≈0.12-0.51 | ≈10-57 | Automatic ≈3000 m | Official values: see Sources |
| Eberspacher Airtronic 3 (various) | 2-8 kW (var.) | By version | By version | Automatic ≈5500 m (var.) | Official values: see Sources |
| Autoterm / Planar Air 2D | 0.8-2.0 kW | 0.10-0.24 | 10-29 | ≈4200 m with high-altitude ECU | Official values: see Sources |
| Autoterm / Planar Air 4D | 1-4 kW | ≈0.12-0.51 | ≈10-57 | Depends on options | Official values: see Sources |
| Truma Combi D 6 (air+water) | 2-6 kW | ≈0.22-0.63 | – | New-generation sensor options | Official values: see Sources |
Note: Power/consumption/altitude values may vary by model version and installation package. Before buying, check the same datasheet that matches the ECU and control unit you’ll be using.
Domestic and Chinese-Origin Brands – Market Realities
In Turkey, domestic brands/suppliers like Webesten and SUGA and Chinese-origin brands like Belief, VEVOR, Hcalory, MaXpeedingrods are common. Some of these brands may offer similar platforms under different names. For this reason, differences can be seen between “label” values and actual field heat output and altitude performance.
| Brand | Example Model / Feature | Nominal | Fuel (L/hour) | Power Draw | Altitude | Note | |
|---|---|---|---|---|---|---|---|
| Webesten (TR) | 12 V 5 kW; portable and fixed kits | ≈5 kW (label) | – | – | – | Where no official/standardized datasheet exists, the “label claim” is used as the basis | |
| SUGA (TR) | 12/24 V 5 kW; spare-parts ecosystem | ≈5 kW (label) | – | – | – | Parts/service access can be an advantage | |
| Belief (CN) | 2.2 kW kit; altitude claims on some versions | 2.2 kW | – | ≈14-29 W (example) | Depends on model | Parameters on official pages may show variation | |
| VEVOR (CN) | 5 kW 12/24 V; “all-in-one” variants | 5 kW (label) | ≈0.18-0.48 | – | – | Marketplace variants may differ | |
| Hcalory (CN) | TB1 (HC-A01) 12/24 V + AC adapter | 5 kW (label) | ≈0.15-0.42 | – | – | Different housing/capacity options available | |
| MaXpeedingrods (CN) | 5 kW Bluetooth; “altitude” on some versions | 5 kW (label) | – | – | – | Depends on model | Pay attention to ECU/sensor version |
Warning: Products marketed as “5-8 kW” often have actual output in the 4-5 kW range in practice. Installation quality (exhaust/combustion air, duct resistance, pump insulation) directly affects performance.
Installation & Safety – Quick Checklist
- Exhaust & combustion air must be 100% isolated from the living space; the stainless exhaust pipe should exit outward, positioned with a slope that prevents water ingress.
- Fuel line & metering pump should be mounted with vibration isolators so vibration isn’t transmitted to the chassis, with correct slope and diameter; don’t forget filtration.
- Electrical: cable gauge/fuse per manufacturer; instantaneous current may spike at first ignition.
- CO/LPG detectors and a smoke alarm are essential; fresh-air return must not be blocked.
- Regulations: In-vehicle heaters are subject to type approval under UNECE R122 (heating safety) and R10 (EMC); check the markings on a per-model basis.
Running It Overnight: A Simple Consumption Scenario
If you run a 2 kW class unit for 10 hours at an average flow of 0.15 L/hour, you’ll consume ≈1.5 L of diesel. Assuming an average of 20 W electrically, that’s ≈200 Wh (12 V ≈ 17 Ah) of consumption. For 4 kW class units, fuel use can approach the 0.5 L/hour range; current draw increases as well.
Which Model Suits Whom?
Compact Panel Van / Small Volume
Webasto AT2000 STC or Eberspacher Airtronic S2 D2L; on a budget, Autoterm 2D. If you camp at altitude, versions with automatic altitude compensation are advantageous.
Medium-Large Volume / Harsh Winter
Webasto Evo 40, Eberspacher D4L, or Autoterm 4D; suitable for multi-vent/long duct layouts.
Air + Hot Water in One Unit
Truma Combi D 6; delivers cabin heat and 10 L of hot water from the same unit, offering a space/efficiency advantage.
Sources (official technical documents & regulations)
- Webasto Air Top 2000 STC – product page / datasheet (official technical values): webasto.com
- Webasto Air Top Evo 40/55 – product/datasheet: webasto.com (via product search)
- Eberspacher Airtronic S2/M2 – brochure/leaflet (automatic altitude ≈3000 m): eberspaecher.com (Documents)
- Eberspacher Airtronic 3 – 2-8 kW & automatic ≈5500 m (press/catalog): eberspaecher.com
- Autoterm / Planar Air 2D – technical parameters & high-altitude ECU: autoterm.com
- Autoterm Air 4D – technical data: autoterm.com
- Truma Combi D 6 – product & manuals: truma.com (Download Center)
- UNECE R122 – Heating Systems (type approval/safety): unece.org
- UNECE R10 – EMC (electromagnetic compatibility): unece.org
