Espar Airtronic S3 D2L
#2 in SplitFull review
For van, truck and boat owners who want a quiet, type-approved 2 kW heater that works at high altitude. It costs much more than clones but is built to run for thousands of hours.
Amazon $1,250$1,250
5 Espar diesel heaters ranked. Each one is scored and ranked against every brand in its type, so "#3 mid-size" means third of all mid-size diesel heaters here, not third among Espar's own.
Espar makes 5 current diesel heaters: 5 split. Prices run from $1,250 for the Espar Airtronic S3 D2L to $1,849.99 for the Espar Airtronic M2 D4R. Its best-rated model: the Espar Airtronic S3 D2L (#2 of 36 split, rated 3.5).
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.
Espar diesel heaters 5
- Espar Airtronic S3 D2L#2 splitFull review
For van, truck and boat owners who want a quiet, type-approved 2 kW heater that works at high altitude. It costs much more than clones but is built to run for thousands of hours.
Amazon $1,250$1,2502.2 kW27 WYes- - Espar Airtronic S2 D2L#4 splitFull review
For van and truck owners who want a type-approved 2 kW heater with low power draw and a timer. The newer Airtronic S3 D2L now does the same job for less.
Amazon $1,315$1,3152.2 kW31 WYes- - Espar Airtronic M3 D4L#5 splitFull review
For larger vans, trucks and boats that need a type-approved 4 kW heater that works anywhere, including high mountain passes. It costs far more than clones but is built for years of daily use.
Amazon $1,675$1,6754 kW37 WYes- - Espar Airtronic M2 D4L#6 splitFull review
For larger vans, sleeper cabs and boats that need a type-approved 4 kW heater with a wide turndown. The M3 D4L that replaces it costs the same and draws less power.
Amazon $1,675$1,6754 kW42 WYes- - Espar Airtronic M2 D4R#11 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$1,849.994 kW65 WYes-
