For motorhomes and boats with long, branching duct runs that a standard 4 kW heater can not push through. Otherwise the D4L is cheaper and draws less power.
Price checked October 30, 2026. As an Amazon Associate we earn from qualifying purchases.
Part of the Espar Airtronic 3 line: See every Espar Airtronic 3 generation.
Every Espar Airtronic 2 model we rank, smallest first. Ratings compare each against its own type.
| Model | Heat output | Rating | Price |
|---|---|---|---|
| Espar Airtronic S2 D2L | 2.2 kW | 3.5/5 | $1,315 |
| Espar Airtronic M2 D4L | 4 kW | 3.4/5 | $1,675 |
| Espar Airtronic M2 D4R (this one) | 4 kW | 3.2/5 | $1,849.99 |
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
| Model number | Airtronic M2 D4R 12V Recreational (25.2746.05.0000) |
|---|---|
| Heating | |
| Heat output (maker) | 4 kW |
| Lowest output | 0.9 kW |
| Fuel burn | 0.11 to 0.51 L/h |
| Build | Split (installed) |
| Power | |
| Supply | 12V |
| Running draw | 6 to 65 W |
| Starting draw | 100 W |
| Controls and safety | |
| Thermostat | Yes |
| Automatic altitude | Yes, to 9,840 ft |
| App | No |
| Timer | Yes |
| Remote | No |
| CO shutoff | No |
| Type approval | ECE R122 |
| Build | |
| Dimensions | 14.8 x 5.5 x 5.9 in |
| Weight | 9.9 lb |
| Released | 2018-07 |
A cheap split kit with Bluetooth control and automatic altitude adjustment, for DIY installs in vans and campers that travel high. Real output is far below 8 kW.
Amazon $119.90 VEVOR $101.55A bargain split heater kit for a van, truck or camper install, with app control and a thermostat. Expect about 3.5 kW of heat, not 8.
Amazon $99.99A well-featured split heater for van and RV builds that want automatic altitude handling and a big tank; expect about 3 kW of real heat, not 8.
Amazon $169.99Compare the Espar Airtronic M2 D4R with any other diesel heater →
More from Espar: every Espar product ranked.
