If a water heater or hot water smells unusual, first notice where the odor is coming from. A gas-like smell in the room calls for immediate action. An odor that appears only when hot water runs calls for a water-heater and water-quality check.
Gas Smell Near Water Heater: What to Do
If the air around a gas water heater smells like gas or rotten eggs, leave the building on foot. Do not use switches, flames, or a phone inside. From a safe location, call 911 and your gas utility. Do not return or attempt to locate the leak yourself. CenterPoint Energy’s gas safety guidance explains these precautions.
Why Does Hot Water Smell Like Rotten Eggs?
If the odor is present at hot taps but not in the room air, it may come from hydrogen sulfide in the water or a reaction involving the water heater’s anode rod. The U.S. Environmental Protection Agency also notes that bacteria in water lines or heaters can contribute. Compare hot and cold water at more than one tap and tell a plumber where you notice the smell. If both hot and cold water smell, contact your water provider as well. A professional can identify the cause before recommending treatment or water-heater maintenance.
Why Does a New Water Heater Smell?
Do not assume a smell after installation is normal. Note whether it comes from the tap water, the appliance, or the surrounding air, and when it began. If it smells like gas, follow the emergency steps above. For a persistent hot-water odor, ask the installer or a plumber to check the heater and water supply.
When to Request Water Heater Service
Persistent odor, discolored hot water, sediment, leaks, or a change in hot-water performance deserve a professional assessment. If you also see particles in the water, this sediment guide offers background, but a plumber can determine the cause in your home. Stanley’s water heater repair and maintenance team in Dayton can inspect the system. You can find Stanley Heating Cooling & Plumbing or return to the home page to request service.
For other water-heater questions, see our frequently asked questions, energy-efficient water heater guide, and guide to water that is too hot on a low setting.