Vertical All-in-One Diesel Air Heater vs Floor-Mounted Split Unit: Which Saves More Cabin Space?

Space is the deciding factor in many cab and cabin heater installs, and buyers often wonder whether a vertical all-in-one diesel air heater or a split floor-mounted unit conserves more room. Both designs aim to heat the space, but they consume it in different ways. Looking at where each part actually sits reveals which one leaves more usable floor.

What the Vertical Box Actually Occupies

The vertical all-in-one unit stands on a footprint of roughly 30 by 40 centimeters, about the size of a laptop, and grows upward rather than sideways. It tucks against a wall, under a bunk overhang, or beside a seat, so the floor space it covers is a small corner that would otherwise hold a storage box. Because everything is in one box, there is no separate blower or duct junction taking an extra patch of floor.

Where a Split Unit Hides Its Parts

A split design separates the combustion body from the warm air outlet, joined by flexible ducts. The heater body can be tucked out of sight under a bench, while the outlet grille sits on a wall. This sounds space-efficient, but the ducts, the extra blower, and their supports still occupy a continuous run of space. Long ducts also need clearance to bend without kinking, which eats into the very space the split was meant to save.

The Practical Space Winner

When a small corner of floor is available near where the warm air is needed, the vertical all-in-one unit uses the least total footprint and the shortest duct run. Reach for a split layout only when the warm air must arrive several meters away in a quiet sleeping area, and the noisy combustion body can live in a separate locker. For the typical day cab, sleeper, or compact workshop, the upright box is the simpler space-saving choice.

References

GB/T 7714: GUO R, LI L, SUN Z, et al. An integrated thermal management strategy for cabin and battery heating in range-extended electric vehicles under low-temperature conditions [J]. Applied Thermal Engineering, 2023, 228: 120502.

APA 7th: Guo, R., Li, L., Sun, Z., & Xue, X. (2023). An integrated thermal management strategy for cabin and battery heating in range-extended electric vehicles under low-temperature conditions. Applied Thermal Engineering, 228, 120502.

MLA 9th: Guo, R., et al. "An Integrated Thermal Management Strategy for Cabin and Battery Heating in Range-Extended Electric Vehicles under Low-Temperature Conditions." Applied Thermal Engineering, vol. 228, p. 120502.