Copy following links: Maybe bad gas control valve thermostat if something got stuck in the valve after they replace gas meter. Or the thing quit working coincidentally when gas company visited.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
http://www.thetankatwaterheaterrescue.com/forums/forum3/
http://waterheatertimer.org/How-to-replace-thermostat-on-gas-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Call plumber
Add a comment and describe gas control valve and what you have done so far.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: A.O. Smith Water Heater Problems
ok here is how a heater works - there is a high setting cut out and a low settin cut out. The cycle is as follows. The water heater first heats to a preset temperature , say 120 degress. You draw water and the temp in the tank drops to say 90 degrees at which point it fires again- sensing that if it doesn't you will run out of water.I think that this setting has been set too low to say 75 degrees and you get cooler water because the heater cannot catch up. You must find this control in book at set the differential to twenty degress.This will stop you from running out of hot water.Just for the record less reputable companies will do this on purpose over a coulpe visits adn tell you the heater is failing and must be replaced. Get a book. In the mean time I need your model # so I can find this setting for you.Wait to hear from you. Allen
SOURCE: i have a 40 gallon reliance 606 gas water heater,
replace the thermocouple assy in the burner area
SOURCE: I have a Richmond 40 gal gas hot water heater
your damper is stuck open and caulsing a down draft blowing the pilot out, make sure its working properly!!
SOURCE: I have a Reliance water heater - 40 gal Model
In my first 15 years as a plumber I never saw a pilot light issue on a gas WH that a new thermocouple didn't fix. Since the government mandated a redesign of the fire box, I've seen three that nothing ever fixed - two Whirlpools and one (my usually ultrareliable) AO Smith - including replacing the entire burner assembly and the regulator. And I've heard of many others.
Check the thermocouple connection for tight. (Don't strip.. threaded soft metals.)
Check the microvents on the bottom ? of the burn box for dust, even if it is new.
Call Reliant and demand new units until you get one that works.
Try another model. Consider a 52gal electric.
I've always recommended gas over electric, and AO Smith and Rheem were my recommendations (and "Reliants" were "lumber yard" water heaters. Sorry.)
Since the mandated redesigns, I don't really have a "proven reliable" model to suggest. I increasingly believe the restricted air flow design is the ultimate culprit, including any changes to the thermocouple/regulator construct to accommodate the restricted air flow design. Just my hunch.
Offered for what its worth. -- plumber in Indiana.
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