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diytom
Re: Limited hot water AFTER flushing water heater
diytom
keith3267 wrote:

Its only 2 years old, so a broken inlet tube seems less likely. The reason for waiting for the water to cool down is for safety, you didn't hurt the water heater. Try closing the gas valve and reopening it. If it has some free play in it, it will need to be replaced.

When you talk about "the gas valve" are you talking about the gas shutoff on the pipe leading to the water heater, or the "ON/PILOT/OFF" valve on the heater itself?

I didn't actually touch the gas shutoff, I just switched the control on the heater itself to PILOT.

-T

keith3267
Re: Limited hot water AFTER flushing water heater
keith3267

If you have the manual for the WH, check out its restart procedure. You may be required to turn it all the way to off before you turn it back on. If you don't have the manual, you might find one on the manufacturer's web page.

Mastercarpentry
Re: Limited hot water AFTER flushing water heater
Mastercarpentry

I'm going to guess that the gas regulator is the problem. After dropping to pilot, something prevented it from fully re-opening so you still get flame and a 'whoosh' but not enough of it anymore. One relevant clue here would be recovery time- how fast does it re-heat completely from a fully-used situation? If the recovery isn't complete in 15 minutes or so (less with an efficient burner) then that's the culprit.

Overnight performance isn't relevant- a too-small flame, given enough time, will develop enough total heat to reach the shut-off temp. Just a pilot light alone will make the water warm overnight with some indoor WH installations. Regulators are a replace-only item for safety reasons, don't attempt repairs on them.

I'd try shutting the regulator off, shutting the gas supply off, turning the regulator to pilot and depress the knob for starting, then turning the gas back on to hopefully clear any small blockage in the regulator. Attempt a relight and see what happens. That may or may not do the trick but it's worth the few minutes it takes to try it. If it will not relight turn the gas supply off and replace the regulator. Put in a new thermocouple while you're in there too- cheap insurance against an often-failing part.

For such simple machines these things can get awfully ornery sometimes!

Phil

diytom
Re: Limited hot water AFTER flushing RESOVED
diytom

I resolved this issue by replacing the dip tube with one from the plumbing supply house.

My local hardware store had the style that has a steel fitting pre-attached, but it didn't look like a thermal isolation fitting as the existing one was. So I went further to the plumbing place that had the simple flare end.

I nearly ripped out my (remaining limited) hair when I was all ready to do the job and couldn't find the new rubber gasket that came with the dip tube. The tube was sold with the rubber gasket in place around the top of the tube. I swear I just saw it.

I had to bend the tube to get it in because of my low ceiling in the basement. Maybe friction again the ceiling while getting it in made the gasket roll off the end of the tube, over the flare, and into the endless night of the basement.

So I put it in with the old gasket. And of course it leaked. So I gave it up for the night.

Next day, I found the gasket. In my shirt pocket. Sheesh.

Either it did flip off the end of the tube, bounce off the ceiling and joist, and land in my pocket....

...or I was concerned about that very thing happening and took it off myself, placing it safely in my pocket, and completely spaced on it.

Anyhow, hot water we got, tons of it.

Thanks to all who helped.

keith3267
Re: Limited hot water AFTER flushing water heater
keith3267

Thanks for the feedback, it makes us better.

Mastercarpentry
Re: Limited hot water AFTER flushing water heater
Mastercarpentry

Thanks for the follow-up. I'm stil wondering how a nearly-new diptube failed but it apparently happens. It seems that every time I take a phone call at work, I lose something and it often gets recovered from the wrong pocket or pouch. I've got lost pencils figured out though; it's behind the other ear!

Phil

ed21
Re: Limited hot water AFTER flushing water heater
ed21

I still remember the time I was looking for my clip on sunglasses and it turned out I had them on.:rolleyes:
In my defense it was a very sunny day and I had been going in and out of a building doing a survey.

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