De Dietrich
Insufficient Storage Capacity or Recovery
Hot water runs out quickly from a De Dietrich storage water heater
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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
Thermostat set too low, Failed immersion or primary heating on De Dietrich cylinder, Heavy limescale reducing cylinder volume, Faulty dip tube or stratification issues
How to Fix / Troubleshooting
Safety first: Cylinder surfaces and pipes can be hot; allow to cool before touching.
Step-by-step checks:
- Check thermostat setting: Increase the cylinder thermostat slightly (within safe limits) to store more usable hot water.
- Check reheat time: After hot water is used, monitor how long the heater takes to reheat. Excessive time indicates a heating fault.
- Insulate cylinder: Ensure the cylinder and hot pipes are properly insulated to reduce heat loss.
When to call a professional: If the immersion heater or primary coil is not heating correctly, professional diagnosis is required.
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Repair Difficulty
Medium
3/5
Required Part
Cylinder Thermostat
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