GEARLASSO DH002 Diesel Heater
#4 in All in oneFull review
A cheap all-in-one heater with app control and a two year warranty, for tents and small vans, with real output closer to 3.6 kW.
Amazon $121.99$121.99
The GEARLASSO DH002 Diesel Heater is the better diesel heater overall, rated 3.2 to 2.9. The GEARLASSO DH002 Diesel Heater leads on warranty. The Hcalory TB MAX2 wins on controls and safety. The GEARLASSO DH002 Diesel Heater costs $178 less ($121.99 vs $299.99).
Hcalory TB MAX2
#19 in All in oneFull review
A well-equipped toolbox heater for campers and garages that want long runtimes, altitude adjustment and quiet nights. Expect about 3 kW of heat, not 8.
Amazon $309.99 Hcalory $299.99$299.99
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the GEARLASSO DH002 Diesel Heater for warranty (2-year warranty vs 1-year warranty).
- Choose the Hcalory TB MAX2 for controls and safety (holds a set temperature, automatic altitude, app, timer vs holds a set temperature, app; no CO sensor).
Scores side by side
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 | GEARLASSO DH002 Diesel Heater | Hcalory TB MAX2 |
|---|---|---|
| Overall rating | 3.2/5 | 2.9/5 |
| Value 25% | 81 $34 per kW ($121.99, 3.6 kW); 8 kW claimed, more than its fuel burn can supply | 38 $107 per kW ($299.99, 2.8 kW); 8 kW claimed, more than its fuel burn can supply |
| Type approval 20% | 0 no type approval published | 0 no type approval published |
| Controls and safety 15% | 62 holds a set temperature, app; no CO sensor | 90 holds a set temperature, automatic altitude, app, timer |
| Power draw 15% | 50 power draw not published (neutral score used) | 50 power draw not published (neutral score used) |
| Warranty 15% | 50 2-year warranty | 0 1-year warranty |
| Low setting 10% | 50 down to 1.4 kW | 83 down to 1 kW (from its lowest fuel burn) |
Specifications
| GEARLASSO DH002 Diesel Heater | Hcalory TB MAX2 | |
|---|---|---|
| Heating | ||
| Heat output (maker) | 8 kW claimed (about 3.6 kW from its fuel burn) | 8 kW claimed (about 2.8 kW from its fuel burn) |
| Lowest output | 1.4 kW | - |
| Fuel burn | 0.15 to 0.45 L/h | 0.12 to 0.35 L/h |
| Fuel tank | 5 L | 7.9 L |
| Build | All in one | All in one |
| Power | ||
| Supply | 12V/24V/110V | 12V/24V/110V |
| Controls and safety | ||
| Thermostat | Yes | Yes |
| Automatic altitude | - | Yes, to 16,400 ft |
| App | Bluetooth | Bluetooth |
| Timer | - | Yes |
| Remote | Yes | Yes |
| CO shutoff | No | - |
| Type approval | None published | None published |
| Build | ||
| Noise | - | 54.6 dB |
| Dimensions | - | 15.74 x 10.83 x 12.87 in |
| Weight | - | 28 lb |
| Warranty | 2 years | 1 year |
| Released | - | 2026-09 |