Beretta
Restricted DHW Flow
Water heater's hot water flow is very low compared to cold taps
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Blocked inlet filter, Limescale in secondary heat exchanger, Partially closed isolation valve, Blocked aerators or shower heads
How to Fix / Troubleshooting
Safety: Hot water can be scalding. Allow the system to cool before working on water connections.
- 1. Compare flows: Check cold water flow at the same tap. If cold is strong but hot is weak, the restriction is likely in or after the heater.
- 2. Clean aerators and shower heads: Remove and descale them.
- 3. Check isolation valves: Ensure hot outlet and cold inlet valves at the heater are fully open.
- 4. Clean inlet filter: Remove and rinse the cold inlet filter screen.
- 5. Descale secondary heat exchanger (technician): If restriction persists, a professional should descale or replace the DHW plate heat exchanger.
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Repair Difficulty
Medium
3/5
Required Part
Secondary plate heat exchanger
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