Hot water heater: running out of water too fast


I just bought a house, and the hot water tank was only 6 months old when I moved in. We've only been in it a week, but it seems that if two people have normal (5 - 10 min) showers in the morning, the hot water runs out by the time the second person is half done. I know noting about a hot water heater except how to change the temperature setting, so am a little lost here. Does anyone have a comment or suggestion about what may be going on, or what I can do before I have to call a plumber? Thanks in advance.
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Hold off on the plumber!!
Just raise the thermostat a few degrees. Is the heater gas or electric? They have different kinds of thermostats. Some are calibrated in degrees-- others just something like cooler/warmer.
Turn it up a little and try it for 2-3 days to see if that helps. If it gets a little better but still not enough hot water, turn it up a bit more.
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Whats the temp setting on now? Might want to try increasing hot water temp a bit first......start with about 10-15 degrees and see if that helps.
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the first 2 responses are good, but how big is the water heater??
mike........
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there was a recall on some hotwater heaters that have a bad fill tube. the one symptom was hot water ran out fast. Do you have a make model and year you can share?
tom @ www.BlankHelp.com
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wrote:

that ended a few years ago (1999?). OP's is much newer than that.
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Ok that means my idea is out.
tom @ www.FreelancingProjects.com
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Is this electric or gas??????? Or solar?
If you have two heating elements in the wh, the bottom element or thermostat may be broken or defective. IIUC that is much more likely than the top one. (actually I don't know what happens when only the top element is defective, but I think the water doesn't get hot at all.)
Turn off the circuit breaker, take off the cover, check with a voltmeter set to 240Volts AC or higher any two contacts that you intend to measure in any other way, and then IF    THE VOLTAGE IS ZERO measure the resistance between the two screws on the heating element. It should be very low.
Try to figure out which two are the proper ones to measure across the thermostat, and after measuring for voltage, and IF THE VOLTAGE IS ZERO, measure the resistance there. It should be zero.
If the heater resistance is not low, or the water is not hot and thermostat resistance is not zero), that part probably needs replacing. The part is less than 20 dollars iirc.
If the water is hot enough, even if the circuit breaker has been turned off, the resistance across the thermostat will be high or infinite. But that is normal when the water is hot enough.
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Gas or electric? If it is electric one of the elements may be bad. It would heat up during night from just one element, but as soon as you start using the water it becomes diluted and cannot recover as fast with only one element working. Even though fairly new, things do break and it may be covered under the warranty.
Another possibility is that it is too damned small and the previous owner went for cheap knowing he will be moving out.
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If you have electric hot water and the water is hot but turns cold sooner than you think it should, the bottom element may have failed. If the water doesn't get to the right temperature or takes a very long time to reheat after being depleted, you may have a top element that has failed. Regards --
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