Vokera
Restricted DHW Flow
Water heater’s hot water flow rate is significantly reduced compared to cold water flow
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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 DHW inlet filter, Scaled DHW plate heat exchanger, Partially closed isolation valve, Debris in pipework
How to Fix / Troubleshooting
Safety first: Turn off power and close the cold water isolation valve before removing filters or pipework.
User checks:
- Compare cold vs hot flow at the same tap. If cold is strong and hot is weak, restriction is likely on the heater’s DHW side.
- Ensure any service valves under the heater are fully open.
Engineer actions:
- Remove and clean the DHW inlet filter.
- Assess and descale or replace the DHW plate heat exchanger.
- Flush the DHW pipework to remove debris.
In hard water areas, regular descaling and a scale reducer can help prevent this issue.
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Repair Difficulty
Medium
3/5
Required Part
DHW Inlet Filter / Plate Heat Exchanger
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