Safety first: Extremely hot water can cause severe burns. Warn occupants and consider shutting off power or gas until the issue is resolved.

Step 1 – Check thermostat setting: For electric units, remove access panels and verify thermostats are set around 120°F/49°C. For gas units, check the dial on the gas control valve and set to a lower setting.
Step 2 – Test water temperature: After adjustments, run hot water for several minutes and measure temperature at a faucet with a thermometer.
Step 3 – Replace faulty thermostat: If temperature remains excessive despite lower settings, replace the suspect thermostat (upper/lower for electric, gas control valve for gas) with an OEM Ruud-compatible part.
Step 4 – Inspect mixing valve: If a thermostatic mixing valve is installed, verify its setting and operation. Replace if it fails to temper hot water.

If overheating persists, discontinue use and contact a professional immediately.

Water from Ruud water heater is too hot; risk of scalding at fixtures.

Possible Causes