Heater frequently displays air in system warnings (if applicable) or gurgling sounds are heard.

Safety: Turn off power while bleeding air to avoid dry firing.

• 1. Bleed air: Open all hot taps and allow water to run until a steady stream without sputtering is achieved.
• 2. Check connections: Inspect upstream fittings for leaks that could draw in air.
• 3. Orientation: Ensure the heater is installed in the orientation specified by Kospel, with correct flow direction.
• 4. System pressure: Verify that water pressure meets minimum requirements; boost pressure if necessary.