Water heater hot then cold
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.
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