Chlorination Procedure


The chlorination procedure is used to eliminate various bacteria in water heaters. Contact a service person to perform this procedure for you.

STEP 1 Turn off the gas or electric supply to the tank.

STEP 2 Turn off the cold water supply valve to the tank.

STEP 3 Open a nearby hot water faucet to relieve the vacuum.

STEP 4 Drain all the water from the tank.

STEP 5 Remove the anode rod(s), and close the drain valve.

STEP 6 Using a funnel in the anode opening add one gallon of household chlorine bleach (e.g. Clorox) for every 25 gallons of tank capacity.

STEP 7 Reinstall anode rod(s) after inspecting and replacing as needed.

STEP 8 Open cold water supply valve and refill the system. Draw the water to every hot water fixture, until the smell of chlorine is detected. Operate dish and clothes washers until a noticeable amount of the chlorine is detected. All hot water lines must receive treatment.

STEP 9 Leave the chlorine solution undisturbed for one hour or more.

STEP 10 After the time has elapsed drain the tank according to steps #2, #3, & #4.

STEP 11 Close the drain valve and refill the tank. Allow the tank to sit for 15 minutes. Repeat steps #2, #3, and #4. Continue to flush the tank if the water is discolored or contains a chlorine odor.

STEP 12 Close the drain valve and refill the tank. Flush all chlorine from the piping by opening every hot water outlet/ appliance.

STEP 13 Return hot water heating system to service by following the recommended start-up procedure posted on the unit or in the manual.