The Eberspächer Hydronic HS3 D5E is a 5 kW diesel-fuelled hydronic water heater engineered for caravans, motorhomes, and campervans. Unlike propane systems, it draws directly from your vehicle's diesel tank — no gas bottles required. Output modulates automatically between 1.3 kW and 5 kW to match demand, minimising fuel use while maintaining consistent hot water and cabin heating. At just 2 kg and 215 × 91 × 144 mm, the heater body is extremely compact with a low 12V draw of just 5–32 W during operation.

Kit includes the Hydronic D5E heater unit with EasyStart Pro 7-day programmable controller, coolant circulation pump, digital fuel metering pump, wiring harnesses, fuel line, exhaust muffler, combustion air intake silencer, and all installation hardware — a complete ready-to-install package.