Ans.To disinfect the hot water heater you need Clorox bleach. This bleach is used when a bad smell or bad taste starts coming from your water. Follow the steps to disinfect the water heater: 1. Empty the water heater by connecting the hose and turn on the drain on the bottom of the tank. Let the water drain into a bucket. 2. Turn the water heater off. 3. Turn off the cold water valve present on the top. 4. Mix the bleach with 2 gallons of water to dilute it. 5. Connect a second hose to the nearby faucet. 6. Place the end of the hose connected to the water heater drain into the bleach solution. 7. Turn on the water heater drain and turn on the faucet to which hose is connected. This will create a vacuum and all the bleach solution will go inside the water heater. 8. Open the cold water valve and let the water flow. Once the water starts coming out, turn it off. 9. Wait for 10-12 hours and then drain the bleach solution from the water heater. Make sure you use a normal non-scented bleach in this process. Also, make sure it does not contain any added chemicals.