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Got RV out of storage, flushed all lines, put plug back in water heater and left Texas for Wyoming. Didn't use water heater until reaching Cody Wy RV park. Got set up and was ready for good old hot shower, Hot water has terrible odor. What is best way to stop the awful odor.

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Extracted and abbreviated from Atwood recommendations.

Shut off water supply and water pump.  Remove drain plug and drain water heater.  Use a flushing wand to flush the water heater.  Replace the plug and remove the pressure/temperature valve. Refill the water heater through the pressure/temperature valve with vinegar and water.  Begin with a gallon of vinegar then a 1/2 gallon of water.  Repeat until water heater is full.  Replace p/t valve and turn water heater on and let is cycle four or five times.  Let the water cool and drain.  Flush with the wand again.  Replace drain plug and fill the water heater with water by normal method.  Should be good to good to go.

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The couple of times we've had the stinky water heater we've followed the sanitizing procedure of putting a 1/4 cup of chlorine bleach into 15 gallons of water in the fresh water tank and then running the hot water faucets (using the pump from the fresh water tank) until smelling the chlorine coming through. Once you've got the water heater full of sanitizing solution leave it for an hour or so and then flush the entire system of the chlorinated water.  You might as well open the cold water faucets and sanitize the entire system while you are at it.

Might be worth a try before following the more involved procedure outlined above.

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I prefer using Purogene rather than bleach. Much easier to flush to no taste for user. Bleach usually takes at least to complete fillups on the fresh water and entire system.

Bill

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If your water heater uses an anode rod, it can slough-off particles that remain in the tank, and they often cause a foul odor. A water heater flushing wand is required to -er, flush them out of the tank.

When the anode rod is half-gone it's time to replace it, before pieces begin to fall into the tank.

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