Question about RELIANCE ELECTRIC WATER HEATER

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Hot water gong cold

When doing dishes the hot water starts to turn cold after appx 1 minute. Then I can turn it off for awhile, start to rinse again & it will do the same thing. Could this be an element problem? Also seems to stay hot if I let it run for a long time.

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Hi .. sounds like the upper thermostat control on yyour water heater needs to be replaced. This could be a DIY project. turn power off and swap the wires from the old tstat to the new tstat. Be sure to have the tstat mounted so the back is in full contact with the metal mater tank.

Posted on May 03, 2010

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Posted on Jan 02, 2017

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Why does the water suddenly runs COLD after many minutes of running hot?


Unless you are using a tankless hot water heater, there is a limited amount of hot water available in the tank. Electric and gas water tanks need time to recover after use, and if you are using heavily, it can exhaust the available supply. That said, there are a couple reasons why you may have less hot water than seems normal. In both electric and gas water heaters, silt can form in the bottom of the tank. This will build up over time and displace water. It also reduces the heating efficiency of gas units. There is a drain valve on the bottom of water heater tanks to allow for purging of this silt periodically, but few ever do it. You could also have, in the case of an electric hot water heater, a bad element or thermostat. Most electric heaters have an upper and lower element and thermostat. If one fails the other will still work, but the water takes longer to get hot and will deplete faster.

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Rinnai RL94i - Produces hot water for 3 minutes, then stops


I just had this exact problem. It kept getting worse until we had no water. Our Rinnai tankless hot water heater started the same way though, with hot water for a few minutes and then would shut off with an error code 10. We just had to shut the hot water off and then back on, wait a minute or so and we had hot water back for a few minutes. Our unit would come on with a loud vibrating noise and remain until it shut off with an error code 10 (air flow fault). The solution was to remove the blower fan and blow out the squirrel cage. Ours had moths in it. We also vacuumed out the fan housing. Be careful to mark any wires you disconnect and take pictures before removal. Our unit is now almost silent when it comes on and supplies endless hot water.
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Jun 10, 2014 | Rinnai RL94i Tankless Water Heater

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Rheem warrior 40 gal warrior


You could start by seeing if the thermostat is wide open. Sounds like it is on low or vacay mode. How far is the run between your heater and the bathing area. Might need to insualet some piping.

Sep 24, 2013 | Water Heaters

2 Answers

I have a Paloma Whole Home 7.4 GPM Water Heater, it is a propane heater. I bought this heater in 07 and I get the same problem ever year. When the weather gets cold and the water is cold the hot water...


If incoming water is too cold, tankless might not have enough time to heat the water as it flows by insince the heat exchanger.

1) You can passively preheat cold water using staging tank, or tampering tank.
http://waterheatertimer.org/Tempering-tank.html

2) Buy old water heater from plumber that is not rusted out.
Replace anode rod to stop further rust.
Rinse tank with water and hydrogen peroxide to kill bacteria that results from anode rod.
http://waterheatertimer.org/Replace-anode-rod.html
Clean sediment out of bottom:
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

3) Don't forget, a tankless heater needs to be de-limed each year, and cannot be exposed to more than 11 grains hard water.

4) Since all costs are energy, when you get tired of messing with tankless.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://waterheatertimer.org/images/Compare-water-heater-parts.jpg

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

I have a Bosch natural gas tankless water heater and the problem I have is that the burners do not ignite until there is ,8 of a gallon of water flowing through it. Thus, once you have suficent hot water,...


Hello Larry,

Unfortunately nothing can be done about the minimum flow for activation.

However, your heater should have a flow control dial that you can turn all the way clockwise which will reduce your activation rate to about 0.5 gal. but that's the absolute lowest.

If the reason is to conserve water than that's about all you can do.

However, if its because the water is too hot and your mixing in cold which is increasing the volume of water you are using, then you should have a burner or flame control, if its a dial turn clockwise for less flame on the burner or the heater may have a slide control which sliding more to the left will lower the burner flame.

Don't forget water valve maintenance in your manual, follow instructions for a water valve rebuild to restore performance to the heater.

That's about it.

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2 Answers

Our water keeps fluctuating between hot and cold. The hot water will not stay on. It lasts about 1 minute and then turns to cold. After about 2-3 minutes it will get hot again?


The inlet line to the water heater goes to the bottom of the water heater to prevent the cold incoming water from mixing with the heated water at the top. The tube going to the bottom can come loose.

Turn the water off and relieve the pressure by opening a faucet and remove the fitting where the water enters the heater. You can see if the pipe is still connected.

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1 Answer

I have replaced my electric water heater and I have checked everything I can think of and I still run out of hot water in 3 minutes. What on earth is the problem.


3 minutes?? does the water run cold then? or just warm?
Is this what the tank you replaced was doing? If so, then you may have: 1 a recirculating pump instant hot water system thats faulty and allowing cold water backflow into hot water piping. 2 A tempering valve that has stuck, allowing cold water into your hot water system.
Or maybe a broken or missing dip tube in your new heater.
If after 3 minutes the water is coming cold out leave that faucet running and go to heater and feel the hot water outlet pipe from the heater. if that pipe is hot then the heater is not the problem. If the hot pipe from the heater is cold the heater is the problem. (Make sure the cold pipe coming into the heater is connected to the Right side marked "cold" !) If there is a tempering valve by the heater: feel the output from the tempering valve, if it is cold and the pipe from the heater to the tempering valve is hot, then the tempering valve is the problem. If all these are OK somewhere in your plumbing system hot and cold may be connected possibly a faucet or showerhead that is shut off at the spout/head, but hot/cold handles are left turned on then cold water can backflow thru hot pipe.

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My water heater cuts of after 30 seconds and shows C2, 11 code


sounds like your gas lines are too small or not enough pressure... or you may have to clean the rods

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1 Answer

Bosch AQ125BNG Burner goes out even though the


Often, this is the result of a restriction of exhaust gases. This type of hot water heater must be adequately vented, (per installation specs). I found this out after taking a number of cold showers. :^( Two years later, and still counting, no more problems. :^)

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