Heatrae Sadia
Thermal Expansion Drip (Open-Vent or Small Unvented Unit)
Heatrae Sadia point-of-use water heater drips continuously from the hot outlet when not in use.
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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
No expansion vessel fitted on small unvented unit, Faulty expansion relief valve, Incorrect installation without expansion control
How to Fix / Troubleshooting
Safety first: Small drips from some point-of-use heaters can be normal, but continuous flow indicates a fault. Isolate power and water if in doubt.
Steps to address:
- 1. Check installation type: Determine if the heater is designed to drip via the outlet (open-vent type) or if it should be fully unvented with an expansion vessel.
- 2. Fit expansion control: For unvented point-of-use models, ensure an appropriately sized expansion vessel and check valve set are installed as per Heatrae Sadia instructions.
- 3. Inspect expansion relief valve: If fitted, check if the valve is passing water continuously. Replace if it does not reseat.
- 4. Verify cold inlet check valve: Ensure the check valve is installed in the correct orientation and is not stuck open.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel / Expansion Relief Valve / Check Valve
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