Hcalory UNIT 2 8kW Diesel Heater
#12 in SplitFull review
A 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 $169.99$169.99
The Hcalory UNIT 2 8kW Diesel Heater is the better diesel heater overall, rated 3.2 to 3.0. The Hcalory UNIT 2 8kW Diesel Heater leads on controls and safety. The VEVOR 8kW 12V Diesel Air Heater costs $86.09 less ($83.90 vs $169.99).
VEVOR 8kW 12V Diesel Air Heater
#17 in SplitFull review
A bare-bones, very cheap split heater kit for DIY installs in trucks, campers and boats at low altitude. Real output is closer to 3 kW than 8.
Amazon $83.90$83.90
Prices 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.
Which should you buy?
- Choose the Hcalory UNIT 2 8kW Diesel Heater for controls and safety (holds a set temperature, automatic altitude, app, timer vs holds a set temperature, timer; no CO sensor).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every split diesel heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Hcalory UNIT 2 8kW Diesel Heater | VEVOR 8kW 12V Diesel Air Heater |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 25% | 72 $61 per kW ($169.99, 2.8 kW); 8 kW claimed, more than its fuel burn can supply | 95 $29 per kW ($83.90, 2.9 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% | 90 holds a set temperature, automatic altitude, app, timer | 45 holds a set temperature, timer; no CO sensor |
| Power draw 15% | 50 power draw not published (neutral score used) | 50 power draw not published (neutral score used) |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
| Low setting 10% | 83 down to 1 kW (from its lowest fuel burn) | 50 down to 1.4 kW (from its lowest fuel burn) |
Specifications
| Hcalory UNIT 2 8kW Diesel Heater | VEVOR 8kW 12V Diesel Air Heater | |
|---|---|---|
| Heating | ||
| Heat output (maker) | 8 kW claimed (about 2.8 kW from its fuel burn) | 8 kW claimed (about 2.9 kW from its fuel burn) |
| Fuel burn | 0.12 to 0.35 L/h | 0.18 to 0.36 L/h |
| Fuel tank | 15 L | 10 L |
| Build | Split (installed) | Split (installed) |
| Power | ||
| Supply | 12V/24V | 12V |
| Controls and safety | ||
| Thermostat | Yes | Yes |
| Automatic altitude | Yes, to 16,400 ft | No |
| App | Bluetooth | No |
| Timer | Yes | Yes |
| Remote | Yes | Yes |
| CO shutoff | - | No |
| Type approval | None published | None published |
| Build | ||
| Dimensions | 15.71 x 5.59 x 6.97 in | 15.5 x 5.5 x 7.1 in |
| Weight | 16.8 lb | 15.4 lb |
| Warranty | 1 year | 1 year |
| Released | 2026-07 | - |