Installation and test of an all-in-one hot water solution for your leisure systems, Vanlife, campervan, motorhome, marine boat, and more! The Pundmann CombiBOIL features a hot water boiler that can be heated in 4 different ways!. It heats water using the power of a diesel air heater, a hydronic loop (Engine Coolant) , which can serve as a preheater for a vehicle's engine or via be heated via the engine or an electric element. Additionally, the hydronic loop can be utilized for underfloor heating throughout the van. It can also heat the water via 240v or 12v. We go through how we installed the hot water heater including the Calorifer into the Vehicle engine + much more!