The Autoterm Air 2D Portable is the better diesel heater overall, rated 3.4 to 2.8. The Autoterm Air 2D Portable leads on type approval, warranty and low setting. The Sunster TR B1 wins on value. The Sunster TR B1 costs $1,467 less ($132.99 vs $1,599.99).
For overlanders, ice fishers and boat owners who want a portable heater with a proven, type-approved core and will pay for it. Clone all-in-ones give similar heat for a fraction of the price.
Amazon $1,599.99A small portable heater for a car, truck cab or tent where 8 kW clones are far too much. Its fuel figures back up its 2 kW rating.
Amazon $132.99Prices were last checked October 30, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every all in one diesel heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Autoterm Air 2D Portable | Sunster TR B1 |
|---|---|---|
| Overall rating | 3.4/5 | 2.8/5 |
| Value 25% | 0 $800 per kW ($1,599.99, 2 kW) | 56 $66 per kW ($132.99, 2 kW) |
| Type approval 20% | 100 type approved (ECE R122) | 0 no type approval published |
| Controls and safety 15% | 50 holds a set temperature, automatic altitude; no CO sensor | 55 app, timer; no CO sensor |
| Power draw 15% | 69 up to 29 W running | 50 power draw not published (neutral score used) |
| Warranty 15% | 50 2-year warranty | 0 1-year warranty |
| Low setting 10% | 100 down to 0.8 kW | 83 down to 1 kW |
| Autoterm Air 2D Portable | Sunster TR B1 | |
|---|---|---|
| Heating | ||
| Heat output (maker) | 2 kW | 2 kW |
| Lowest output | 0.8 kW | 1 kW |
| Fuel burn | 0.1 to 0.24 L/h | 0.1 to 0.26 L/h |
| Fuel tank | - | 5 L |
| Build | All in one | All in one |
| Power | ||
| Supply | 12V | 12V/24V/110V/240V |
| Running draw | 10 to 29 W | - |
| Controls and safety | ||
| Thermostat | Yes | - |
| Automatic altitude | Yes, to 13,780 ft | - |
| App | No | Bluetooth |
| Timer | No | Yes |
| Remote | No | Yes |
| CO shutoff | No | No |
| Type approval | ECE R122 | None published |
| Build | ||
| Noise | - | 35 dB |
| Dimensions | 24 x 16.5 x 19 in | - |
| Weight | 25.5 lb | 15.7 lb |
| Warranty | 2 years | 1 year |
| Released | - | 2026-08 |
