Reliance water heater produces rotten egg or sulfur smell in hot water

Safety first: Turn OFF power or gas. Allow water to cool somewhat before draining. Use proper ventilation when using disinfectants.

Steps to check:

• 1. Confirm smell source: Verify odor is only from hot water taps. If cold water also smells, the issue is with the supply, not just the heater.
• 2. Disinfect tank: Drain several gallons from the tank, then introduce a diluted hydrogen peroxide solution (per Reliance or local plumbing guidelines) through the hot outlet or anode port. Let sit for several hours, then flush thoroughly.
• 3. Replace anode rod: Consider replacing the magnesium anode rod with an aluminum/zinc alloy anode designed to reduce odor. Use a Reliance-compatible rod and proper torque.
• 4. Increase usage/temperature temporarily: Temporarily raising the tank temperature (with caution) and running hot water through all fixtures can help kill bacteria. Return to safe temperature afterward.
• 5. Consider water treatment: If odor persists, consult a water treatment specialist about whole-house filtration or softening.

Warning: When raising water temperature above 120°F for disinfection, take steps to prevent scalding and clearly warn occupants.