Termet Kettling / Boiling in Heat Exchanger

Water heater makes loud banging or popping noises during operation.

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.

Possible Causes

Heavy limescale buildup in Termet heat exchanger, Localized overheating due to poor flow, Incorrect gas rate too high, Air pockets in heat exchanger

Safety: Noisy boiling can precede overheating. Monitor temperature and shut down if necessary.

Descale immediately: Perform a chemical descaling of the Termet heat exchanger using a pump and appropriate descaling solution.
Check flow: Ensure all inlet filters are clean and that water flow is adequate.
Bleed air: Run hot water taps fully open for several minutes to purge air from the system.
Gas adjustment: Have a technician verify and adjust the gas rate to Termet specifications to prevent excessive firing.

Hard 4/5

Primary Heat Exchanger

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