Eberspacher D2 vs D4 vs D5: Which Airtronic Heater Do You Need? (2026)
Eberspacher D2 vs D4 vs D5: Which Airtronic Heater Do You Need? (2026)
Last updated: August 2026
The Eberspacher (also written Eberspcher) Airtronic series is Webasto’s main competitor in the parking heater market. The D2, D4, and D5 are the three most popular models. This guide from IntelliGenParts Co. helps you choose the right one and source replacement parts at wholesale prices.
Quick Comparison
| Feature | Airtronic D2 | Airtronic D4 | Airtronic D5 |
|---|---|---|---|
| Heat output | 2.2 kW | 4.0 kW | 5.5 kW |
| Voltage | 12V / 24V | 12V / 24V | 12V / 24V |
| Fuel consumption | 0.05-0.25 L/h | 0.10-0.49 L/h | 0.14-0.66 L/h |
| Weight | 2.7 kg | 4.5 kg | 5.9 kg |
| Dimensions (mm) | 310x115x120 | 370x140x150 | 400x160x170 |
| Best for | Cars, vans, small cabins | RVs, trucks, mid-size cabins | Large RVs, boats, expedition vehicles |
| Typical price (new) | $700-1,000 | $900-1,300 | $1,200-1,800 |
When to Choose the D2
The Airtronic D2 is the right choice if you need to:
- Heat a small cabin (cars, vans, pickup truck campers)
- Pre-warm a small engine in moderate cold (down to -20C)
- Save space and weight (2.7 kg – lightest in the series)
- Save on fuel (consumes only 0.05-0.25 L/h)
Common D2 Replacement Parts
- Glow pin: 252070011100 (12V), 252106011000 (24V) – $14.90
- Water pump: 252201010002 – $30
- Fuel pump: 252143010016 – $19.98
- Burner: 251922010001 – $36
When to Choose the D4
The Airtronic D4 is the most popular model in the series – a good balance of size, output, and fuel efficiency. Choose it if you need to:
- Heat a mid-size cabin (Class B/C RVs, pickup trucks)
- Pre-warm a heavy-duty engine in cold weather (down to -30C)
- Run the heater for extended periods (4+ hours continuously)
Common D4 Replacement Parts
- Glow pin: 252143010014 (12V), 252143010015 (24V) – $14.90
- Water pump: 252201010001 – $30
- Fuel pump: 252143010016 – $19.98
- Burner: 251922010002 – $40
- Flame detector: 252113010005 – $14.90
When to Choose the D5
The Airtronic D5 is the largest in the series, suitable for:
- Large cabins (Class A RVs, boats, expedition vehicles)
- Extreme cold weather operation (down to -40C)
- Long-duration heating (6+ hours continuously)
- Heating both cabin and engine simultaneously
Common D5 Replacement Parts
- Glow pin: 252143010018 (12V), 252143010019 (24V) – $14.90
- Water pump: 252201010003 – $35
- Fuel pump: 252143010020 – $25
- Burner: 251922010003 – $45
D2 vs Webasto Thermo Top C
The D2 and Thermo Top C are direct competitors in the small-cabin market. Comparison:
| Feature | Eberspacher D2 | Webasto Thermo Top C |
|---|---|---|
| Heat output | 2.2 kW | 5.2 kW |
| Weight | 2.7 kg | 5.9 kg |
| Fuel consumption | 0.05-0.25 L/h | 0.10-0.24 L/h |
| Best for | Smaller cabins | Mid-size cabins |
| OEM price | $700-1,000 | $800-1,200 |
Choose D2 for fuel efficiency in small spaces. Choose TTC for more heat output.
D4 vs Webasto Thermo Pro 90
The D4 and Pro 90 target different markets – the D4 is for cars/RVs while the Pro 90 is for large trucks.
| Feature | Eberspacher D4 | Webasto Thermo Pro 90 |
|---|---|---|
| Heat output | 4.0 kW | 9.0 kW |
| Best for | RVs, mid trucks | Large RVs, commercial trucks |
Choose D4 for most RV/truck applications. Choose Pro 90 only for very large cabins or extreme cold.
Most Common Eberspacher Failures
Same failure pattern as Webasto heaters:
- Glow plug (40% of failures) – $14.90
- Flame detector (20%) – $14.90
- Fuel pump (20%) – $19.98
- Water pump (15%) – $30
- Burner chamber (5%) – $36-45
FAQ
Are Eberspacher parts interchangeable with Webasto?
No. The parts are brand-specific and not interchangeable. Use only the correct Eberspacher part numbers for your Airtronic model.
Can I use Eberspacher parts in a Webasto heater?
No. Form-fit-function is different. Always match the part to the brand and model.
Which is more reliable, Eberspacher or Webasto?
Both are extremely reliable when maintained. Eberspacher has a slightly larger market share in Europe; Webasto dominates in North America. Choose based on availability of parts and service in your area.
Where to buy Eberspacher parts wholesale?
IntelliGenParts Co. stocks OEM-quality replacement parts for Eberspacher D2/D4/D5 at 40-60% below dealer prices. Glow plugs from $14.90, water pumps from $30. Browse complete Eberspacher collection or contact us for a quote.
Shop Eberspacher Parts
Browse complete Eberspacher Airtronic parts at IntelliGenParts Co. All parts in stock, 1-year warranty, ships Canada/USA in 7-12 days.