Kenmore water heater’s hot water temperature fluctuates noticeably during a shower

Safety: Sudden temperature changes can cause scalding. Adjust carefully.

• Check mixing valves: Inspect shower and sink single-handle faucets for internal mixing valve failure that can cause cold water to bleed into hot lines. Replace faulty cartridges.
• Verify heater size: Ensure the Kenmore heater capacity matches household demand. Consider upgrading if undersized.
• Thermostat adjustment: On electric models, ensure both upper and lower thermostats are set to the same temperature.
• Recirculation system: If present, verify proper check valves and pump operation to prevent backflow.