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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:
scott d
From the description of how the drain hose will have to run, it probably won't drain and if it did, it would be very slow. If the hose has to go up 8 feet, it would probably need to have a pump. I recommend draining it into a bucket and then empty the bucket, when it gets full.
by scott d Earned 3,268 community points in Dishwashers
September 24th, 2011
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