Wittmann Tempro - Plus D 360 Manual Extra Quality

To prevent damage from overheating, never shut down the unit by pulling the electrical disconnect while the heater is active. Use the Fn key to select a cooling sequence (e.g., "cool down stop") and wait for the pump to stop before turning off the main power.

The direct cooling principle (D series) injects cold water directly into the hot circulation loop via a venturi ejector, eliminating the need for a separate plate heat exchanger. This design reduces lag time by 60% compared to indirect cooling units. Wittmann Tempro Plus D 360 Manual