Expert Water Heater Repair Services in Sunnyvale, CA

A sulfur odor is usually caused by anaerobic bacteria in your water supply reacting with the tank's magnesium sacrificial anode rod. Our technicians in Sunnyvale, CA can sanitize the tank and install an aluminum-zinc or powered titanium anode rod to neutralize the smell permanently.

If rust appears only in your hot water (not cold), the internal steel tank or sacrificial anode rod is corroding. If caught early, replacing the anode rod can save the tank; if the tank interior itself has rusted through, replacement is required.

A hissing sound in gas heaters often occurs when condensation drips onto the hot burner assembly. Whistling usually indicates restricted water flow through a valve or excessive internal pressure escaping past a safety seal.

Repair costs depend on the diagnosis. Minor repairs like thermocouple or pressure valve replacements are very affordable, while electronic control boards or gas valves cost slightly more. With Water Heater Repair Masters, you always receive a clear, upfront written estimate before any work begins.

When water heats up, it expands by about 2% to 3%. In homes with a backflow preventer or check valve, this expansion creates severe pressure spikes. A thermal expansion tank absorbs this pressure, preventing leaks and protecting your warranty.