The Hcalory TB MAX 8 kW diesel heater is one of the most modern diesel parking heaters and combines a compact design, smart app control and high heat output with low consumption. In my detailed test, I show how the diesel parking heater performs in the motorhome, when camping or in the workshop, which technical innovations distinguish it from older Vevor models and which safety functions make the heater special. In addition to the manufacturer’s portrait of Hcalory, it covers design, technology, installation, CO monitoring and automatic start-stop – right through to a comparison with other diesel parking heaters and my practical test in the animal house and garden shed.