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Yep, need to look at that.
Thanks

Yes, have since found that out. Thanks. Looks like I may go electric since I have that option. Can't see spending $1000 on a power vented.

See the pic.Didn't think that was "normal" when you take care of it.
So I need a new one. Mine has the power vent on it, no chimney. I suppose this is just a regular water heater with the power...

I thought they were good till they start leaking, rusting out. What else goes bad on the inside to prevent heating up? And thanks all.
And what brand do you recommend?

Could the temp probe be scaled up or bad causing issues? Only thing I haven't checked or changed.

No leaks anywhere. It happens at any shower or faucet in the house. Should the water heater turn on sooner?

I suppose it could! I've flushed it since new a few times a year though.

To add.
Water heater turns back on after 5 gallons used.
Thanks

I know this question has been asked many times, but the solutions haven't helped me as of yet.
Culprit: 2001 AO Smith gas 40 gallon water heater.
Problem: Hot water only lasts about 10 gallons....