Hot water temperature fluctuates when other taps or appliances are used.

Safety: Beware of sudden hot or cold surges at taps.

• Clean inlet filters: Remove and clean cold water inlet filters on the Fondital heater.
• Flow balancing: Avoid running multiple high‑demand appliances on the same line as the heater, or have a plumber re‑pipe to reduce interaction.
• Flow sensor check: Replace a faulty or oversensitive DHW flow sensor if temperature swings are severe.