Espar Airtronic M2 D4R
#11 in SplitFull review
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.
Amazon $1,849.99$1,849.99
The Espar Airtronic M2 D4R is the better diesel heater overall, rated 3.2 to 3.0. The Espar Airtronic M2 D4R leads on type approval and low setting. The VOYOCHT VYH-F2 5kW Diesel Heater wins on value. The VOYOCHT VYH-F2 5kW Diesel Heater costs $1,670 less ($179.99 vs $1,849.99).
VOYOCHT VYH-F2 5kW Diesel Heater
#21 in SplitFull review
An aluminum cased split kit with an honest 5 kW rating, a big tank and a remote, for truck cabs and campers. It costs more than most clones.
Amazon $179.99$179.99
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.
Which should you buy?
- Choose the Espar Airtronic M2 D4R for type approval (type approved (ECE R122) vs no type approval published) and low setting (down to 0.9 kW vs down to 1.4 kW).
- Choose the VOYOCHT VYH-F2 5kW Diesel Heater for value ($36 per kW ($179.99, 5 kW) vs $462 per kW ($1,849.99, 4 kW)).
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 | Espar Airtronic M2 D4R | VOYOCHT VYH-F2 5kW Diesel Heater |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Value 25% | 8 $462 per kW ($1,849.99, 4 kW) | 89 $36 per kW ($179.99, 5 kW) |
| Type approval 20% | 100 type approved (ECE R122) | 0 no type approval published |
| Controls and safety 15% | 65 holds a set temperature, automatic altitude, timer; no CO sensor | 50 controls not stated (neutral score used) |
| Power draw 15% | 0 up to 65 W running | 50 power draw not published (neutral score used) |
| Warranty 15% | 50 warranty not published (neutral score used) | 0 1-year warranty |
| Low setting 10% | 92 down to 0.9 kW | 50 down to 1.4 kW |
Specifications
| Espar Airtronic M2 D4R | VOYOCHT VYH-F2 5kW Diesel Heater | |
|---|---|---|
| Heating | ||
| Heat output (maker) | 4 kW | 5 kW |
| Lowest output | 0.9 kW | 1.4 kW |
| Fuel burn | 0.11 to 0.51 L/h | 0.18 to 0.53 L/h |
| Fuel tank | - | 15 L |
| Build | Split (installed) | Split (installed) |
| Power | ||
| Supply | 12V | 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 | Yes |
| CO shutoff | No | - |
| Type approval | ECE R122 | None published |
| Build | ||
| Dimensions | 14.8 x 5.5 x 5.9 in | - |
| Weight | 9.9 lb | - |
| Warranty | - | 1 year |
| Released | 2018-07 | - |