Buy Hcalory Toolbox 2S Plus:
https://amzn.to/3YaVX7uThe Hcalory Toolbox 2S Plus diesel heater brings a level of features you normally only find in units two or three times the price. It delivers fast startup, strong heat output, clean mobile app control, and high altitude compensation paired with an industry-leading wireless remote that includes a built-in temperature sensor and carbon monoxide detector. It is easily one of the most feature-packed heaters in its class, but it does come with a few design choices you’ll need to understand and work around. None are deal breakers, but they are worth knowing before you buy.
In this review, I break down the performance, quirks, and real-world solutions that make the Toolbox 2S Plus such a strong value for overlanders and campers. On startup, the heater fires up in about three minutes and runs cleaner than many budget diesel heaters I’ve used. Heat output is excellent, with temperatures hitting around 400 degrees on high. Even though this is rated as an eight-kilowatt unit, it draws only five kilowatts of power, giving you strong performance with lower consumption. The six-liter fuel tank, paired with its efficient heater core, is capable of up to 50 hours of runtime. There is no external fuel gauge, but opening the case to check levels is quick and simple.
One of the standout features is high altitude mode. At elevation, many diesel heaters run too rich and either shut down or fail to start. The Toolbox 2S Plus automatically adjusts the air-fuel mix for these conditions and includes features usually only found on heaters closer to the six-hundred-dollar price point. The included coupon code makes it even more competitive. Hcalory sent this unit for review but did not pay me, and I can give my honest feedback. If you decide to purchase one, using the link or QR code in the video helps support the channel at no additional cost.
The larger three-and-a-half-inch outlet moves more air than standard three-inch heaters, helping prevent overheating and shutdowns when heating a rooftop tent. The challenge is that three-and-a-half-inch hose is not a common size, but a four-inch insulated hose clamps down easily and works extremely well. This theme appears throughout the heater: a few unusual design choices that look questionable at first but are easily solved.
Control options are another highlight. The Toolbox 2S Plus includes a tethered color-screen controller, a wireless LCD remote, and a mobile app. The wireless remote doubles as a thermostat and carbon monoxide alarm. In real-world use, the thermostat holds a steady temperature through the night, avoiding the typical cold-hot-cold swings of heaters without regulated temp control. The CO alarm adds peace of mind in smaller spaces like rooftop tents.
Noise levels are average for diesel heaters. The fan moves a lot of air, and the combustion intake has a typical pump tick, but adding the included muffler and positioning the vents away from your sleeping area helps considerably. Mesh vents on the sides of the case mean it is not dust or water resistant, and the pump sits directly behind these vents. There is also a large unused hole in the bottom of the case, most likely carried over from a previous version where the exhaust exited downward. It is not ideal, but making a small plug to close it off is simple.
The standard blue fuel cap works fine when stationary, but like all heaters using this style, it may leak when bouncing around on trails. Replacement caps are inexpensive and easy to install. Despite these quirks, the heater remains airtight under normal use and delivers excellent heat output with strong efficiency.
The biggest design challenge is the exhaust layout. The hot air outlet sits directly above the exhaust, which means the heater hose could droop and contact the exhaust pipe. The internal exhaust line is wrapped in heat shielding, but adding a small metal shelf or divider prevents contact entirely. It is an inexpensive and effective workaround that makes the heater much safer to run.
The Toolbox 2S Plus is an impressive balance of features and price. It offers premium capabilities like altitude compensation, remote temperature control, thermostat mode, carbon monoxide detection, and app connectivity at a cost far lower than competitors. Once you understand the few areas that need attention and apply the simple workarounds, this heater becomes one of the best overall values on the market. For anyone looking for a diesel heater that delivers excellent performance with a strong feature set, the Hcalory Toolbox 2S Plus deserves serious consideration.