A Black Friday "deal" is often a normal price next to an inflated list price. Here a diesel heater only counts as on sale when its checked price is at least 15% below its own typical price over the last 90 days, from our price history. The best-rated models are listed too, since many are good value without a sale.
On sale now
No diesel heater rated 3.8 or higher is 15% or more below its typical price at the last price check (October 30, 2026). Prices are rechecked through the sales; this list updates when one drops. See the recent price changes.
Best buys at their normal price
The top-rated models in each type. A sale on one of these is worth more than a big discount on a weaker model.
Best Split Diesel Heaters
- maXpeedingrods 8KW Bluetooth Heater#1 of 36Full review
A bargain split heater for a van, RV or workshop on a budget. Expect closer to 5 kW than the 8 kW on the box, and no stated warranty.
Amazon $95.99$95.99~5 kW-No9 L - Espar Airtronic S3 D2L#2 of 36Full 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- - Autoterm Air 2D#3 of 36Full review
For van and boat owners who want a type-approved 2 kW heater for less than Webasto or Espar. Add a timer panel if you want it warm before you wake.
Amazon $949.99$949.992 kW29 WYes-
Best All-in-One Diesel Heaters
- Autoterm Air 2D Portable#1 of 34Full review
For overlanders, ice fishers and boat owners who want a portable heater with a proven, type-approved core and will pay for it. Clone all-in-ones give similar heat for a fraction of the price.
Amazon $1,599.99$1,599.992 kW29 WYes- - Mudiro M-5S Ultra Diesel Heater#2 of 34Full review
A cheap all-in-one heater for tents, garages and vans that adds a CO shutoff and automatic altitude adjustment, though its real output is well under the 8 kW rating.
Amazon $129.99$129.99~2.9 kW-No5 L - Sokaiso 8kW App Diesel Heater#3 of 34Full review
A very cheap heater with thermostat, app control and a two year warranty, for tents, garages and occasional van use. Expect closer to 4.2 kW than the 8 kW on the box.
Amazon $77.69$77.69~4.2 kW-No5 L
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.