Water heater starts but shuts off when another tap is opened or closed, causing temperature shocks.

Safety: Beware of scalding when temperature spikes occur.

• Limit simultaneous use: Avoid running multiple high-flow taps or showers at the same time if the heater capacity is limited.
• Install pressure stabilizer: A pressure-reducing valve or hydraulic balancer can reduce sudden pressure swings.
• Adjust flow restrictors: Fit flow restrictors to high-demand outlets to keep total flow within heater capacity.
• Consult installer: For persistent issues, have the plumbing layout and heater sizing reviewed.