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Water won't stay hot long

The burner comes on when it's supposed to and heats the water but must not heat it completely because the hot water runs out too soon. Any suggestions?

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  • Water Heaters Master
  • 5,245 Answers

1) Thermostat may be bad, or out of calibration. Set temperature higher, and/or troubleshoot by type of gas control.
Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html


2) Dip tube broken
http://waterheatertimer.org/Water-heater-dip-tube.html

3) Water leak running hot water out of tank.
Turn off all taps and put ear against pipe listening for water leak.

Posted on Dec 09, 2012

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gas regulator gone bad

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SOURCE: burner didn't ignite on my AO Smith model FXGT/PGXT

Unless your AO is a high recover it will take a while for it to fill up with the water that you have used then reheat the water in the tank.

Posted on Dec 18, 2008

canddplumb
  • 35 Answers

SOURCE: Not enough hot water to complete shower. Noticed

If it is a new water heater it might be that the water supplies are crossed. The cold water should be installed on the right hand side of the tank or on the bottom if your tank hooks up on the side. If its an older water heater the dip tube may have broken off. This is a tube that runs from the top of your water heater on the cold side to the lower portion of the tank.It puts the cold water in the bottom of the heater which pushes the hot water to the top.To change the dip tube out you must disconnect the cold water supply from the 3/4 inch nipple at the top of the tank. Then with a pipe wrench unscrew the nipple from the tank it will have the remainder of the tube on it.You can get a replacement dip tube at a plumming supply. Installation is opposite of removal. If this is your problem I suggest you get a new water heater .Usually its caused from minnerals in the water or buy two dissimiler metals being connected together in the water piping system causing corrosion Your water heater will probably fail in the near future.

Posted on Dec 16, 2009

  • 120 Answers

SOURCE: Hi there, I have a rinnai 20 ,the water heats up

Usually this type of fault is down to poor water flow. Basically you are asking the unit to work at a level below it's minimum output. Easy thing to try is to check any filters or water flow limiters in your tapware. Usually these are in the nozzle of the tap. I often take these out. The inifinty reduces water flow anyway and there is no reason to have water limiters. Try turning on two taps at once. If this stops the fault then you definately need to increase your water flow. Make sure the mains water is turned on full. Aslo you can check the cold water filter on the infinity. It's just above the cold water isolation tap (middle pipe as you look at it), turn that off first, the filter is a round plastic nut, unscreww it and clean the filter. Reconnect, turn you mains water back on.
There are other faults but this is by far the most common.

Posted on Aug 15, 2010

  • 10865 Answers

SOURCE: Whirlpool gas water heater model FG1H5040T3NV. The

Hello. I see this all the time with these Whirlpool units. Do this:
Make sure that the end of the thermocouple is over the pilot light. The therocouple needed to be pushed farther thru the hole in the bracket.

That may solve your problem, I hope it does.

That said, if this is a new unit, seriously consider returning it. IF it is not new and the suggestion above does not solve the problem replace the thermocouple. IF that does not solve it, replace the gas valve. Joe

Thanks for choosing Fixya!

Posted on Nov 29, 2010

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Thermocouple has 2 ends. One end attaches to gas control valve, other end sits inside the pilot flame.
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If pex line burst, that implies very high pressure, caused by closed system with check valve that stops expansion, or possible clog in the water line, or high local water pressure, or clogged factory-installed heat traps.
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If the water was super hot, then overheating could have caused the pipe explosion.
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Copy following links for troubleshoot resources, including troubleshoot by type of gas control valve:
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The pilot won't stay lit on gas hot water tank.


Make sure thermocouple tip is seated inside the burner flame.
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Increase air supply to water heater. Open a window and see what happens.
Check for adequate draft going up chimney using match under vent hood to see if smoke drafts immediately upwards.
Bleed air out of gas line.
Check gas pressure.

Open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
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In front of the pilot flame, (it might have a double flame... (one flame on the bottom & another on top.) is a curved piece of metal plate. The flame is supposed to heat that plate untill it it very hot! Thenm the plate bends down as it is a bimetyaalivc strip!
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Right in front of the flame, is a pointed sensor with it's tip in the flame. . It has a electric cable running to a safety valve. This sensor have to heat up as well. It is a heat battery that activates the valve. See that it did not move!
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