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Water heater hot then cold

Hello,
I have an 85 gallon Marathon high-efficiency electric water heater--domestic water only. Lately we are getting very hot water for a few minutes but then the water goes cold. No matter how long we run it at this time it won't get hot again. If we come back later, same thing happens-- very hot water for 5 minutes or so , then starts to cool down and then cold.
No other appliances are running-- no dishwasher, washing machine ( we wash cold anyway ) , nothing else drawing domestic hot water.
Any ideas?

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Dishwashers , Building Supplies
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8 Answers from these members:
Manage My Life
Not having hot water when it is needed can be upsetting. While you wait for the expert to review your unit if you would like to check some general troubleshooting information I attached to the links below.
by Manage My Life
September 17th, 2011
Answered in 16 minutes
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