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Old 10-26-2006, 07:44 AM   #1
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Cold Shower

I have a relatively new (3 years) gas water heater. After install the water was WAY too hot, so I turned it down quite a bit. This was over two years ago, and all has been fine. However, I have noticed in the last several months that I have to turn the knob hotter in the shower to get the same temp I used to. But we could still usually get three showers in the morning.

Today, though, there was nothing but lukewarm, even when turning the knobs all the way hot. I checked the unit, and the pilot is on, everything LOOKS fine, but no hot agua.

Any ideas?


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Old 10-26-2006, 10:31 AM   #2
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Dirty or obstructer burner orifice maybe?
Gas pressure?

I would check these things first. Especially the orifice, more likely to become blocked or dirty over the years.


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Old 10-26-2006, 11:09 AM   #3
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If this has been a gradual problem, my first thought is the dip tube.

Check the water temperature at the closest two-handled faucet to the water heater. If you get 120 degrees or above, then the burner system is probably fine.

If the temp drops rapidly, then cold water is mixing with the hot during draw down.

You can look at page 62 of this service manual.

This will tell you how to test the heater for 'not enough hot water' conditions.
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Old 10-26-2006, 12:50 PM   #4
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I had similar problem before, after calling the utility company, the person help fix the problem over the phone, what we did is like this:

- unplug a computer cable type connector from the sensor with the unit, the sensor is controling turning on/off the water heater.

- then wait one minute, the plug it back.

then it works...

looks like some electronic stuff need to reset....

this problem occurs to us when my 2 year old son turn the knob controlling the temperature which locate at the feet level within his reach and is so attractive with some red arrow marks....etc...
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Old 10-26-2006, 04:54 PM   #5
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Another thing to check is sediment on the bottom of the tank. Have you drained and flushed the unit since it was installed? Deposits (especially where water contains lots of minerals) can form on the tank bottom and slow the heating process to replenish used water. The heat has to go through any sediment build-up. Does the tank have "popping" sounds when the unit kicks on? This is what you usually hear when a build-up is present.
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Old 10-26-2006, 07:33 PM   #6
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Thanks for the useful replies. No popping sound that I've noticed. But I haven't flushed the tank ever. Heh.....don't really know how. We DO have a Kinetico water softener, so hopefully that helps against sediment.

When there was no hot water this morning, it surprised me, b/c there had been no water run in the house for 8+ hours. Anyway I turned it up some, and within an hour or two took a nice long hot shower and never ran out. So I will mark this thread to come back to and just keep an eye on the unit for now.


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