The typical 6 gallon water heater consumes about 1,000 watts or 3,400 btu/hr on electricity but about 10,000 btu/hr on propane. So propane heats water much faster.
Having said that I can't imagine that electric power won't keep the water tank hot, it will just take longer to heat it back up after a shower or something.
Is that what you are experiencing, or does it never get hot?
David
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