If you want reliable, dry heat without being tied to a campsite hook-up, a diesel air heater is your best friend. Below, we explain how they work, how much they cost to run, how to keep noise low, and the key safety and installation requirements we insist on for VW Transporters. How diesel heaters work A compact unit burns a small amount of diesel in a sealed chamber and blows warm, dry air into the living space. Combustion fumes and moisture exit outside via the exhaust. Res