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 and the WAYSKA WKH-B3 8kW Diesel Heater are evenly matched, rated 3.2 and 3.1. The Hcalory UNIT 2 8kW Diesel Heater costs $20 less ($169.99 vs $189.99).
WAYSKA WKH-B3 8kW Diesel Heater
#15 in SplitFull review
A complete split kit with a big tank and remote for trucks, trailers and boats, but it is a generic clone priced well above others like it.
Amazon $189.99$189.99
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.
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 | WAYSKA WKH-B3 8kW Diesel Heater |
|---|---|---|
| Overall rating | 3.2/5 | 3.1/5 |
| Value 25% | 72 $61 per kW ($169.99, 2.8 kW); 8 kW claimed, more than its fuel burn can supply | 80 $47 per kW ($189.99, 4 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 | 50 controls not stated (neutral score used) |
| 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 | 50 warranty not published (neutral score used) |
| Low setting 10% | 83 down to 1 kW (from its lowest fuel burn) | 33 down to 1.6 kW (from its lowest fuel burn) |
Specifications
| Hcalory UNIT 2 8kW Diesel Heater | WAYSKA WKH-B3 8kW Diesel Heater | |
|---|---|---|
| Heating | ||
| Heat output (maker) | 8 kW claimed (about 2.8 kW from its fuel burn) | 8 kW claimed (about 4 kW from its fuel burn) |
| Fuel burn | 0.12 to 0.35 L/h | 0.2 to 0.5 L/h |
| Fuel tank | 15 L | 15 L |
| Build | Split (installed) | Split (installed) |
| Power | ||
| Supply | 12V/24V | 12V |
| Controls and safety | ||
| Thermostat | Yes | - |
| Automatic altitude | Yes, to 16,400 ft | - |
| App | Bluetooth | - |
| Timer | Yes | - |
| Remote | Yes | Yes |
| Type approval | None published | None published |
| Build | ||
| Dimensions | 15.71 x 5.59 x 6.97 in | - |
| Weight | 16.8 lb | - |
| Warranty | 1 year | - |
| Released | 2026-07 | - |