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Problem with hot water flowing from cold outlet

Just moved into my house and found that when you turn the cold water on (at any cold water outlet such as faucets, tubs, outdoor water hose and even the toilet), the water comes out hot for approx 10 second and then turn to cold. There isn't a hot water circulating pump or crossed piping connections that I can find. I haven't had a plumber look at it yet but I can't find anyone handy that has ever heard of such a problem. Is this something common or does it sound like a serious problem. Please let me know what you think.

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The hot and cold pipes run in the wall next to one another. So the water turns cold again as soon as the water starts flowing

Posted on Jun 16, 2009

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I have a Rheem Stella 850 series 360 L which is one year old. I have noticed the last few days that the hot water pressure is dropping and water flow is fluctuating in and out.


Did you do back flow? Suggest you perform back wash via the hot water outlet of your heater by plugging a hose. What is the tubing size that flows thru the heating elements? If it's small, maybe you need to apply higher back pressure to remove the soil. Does it have a built in pump? If it has, check the ******* strainer, maybe it's cloaked up with debris, you never know what's in the line.

Jun 21, 2016 | Rheem Water Heaters

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Our gas water heater (Rheem Optima Quick recovery 81 series) heats the water as evidenced by the steaming water we can release from the temperature and pressure relief valve but we get no hot water from...


Sounds like a plumbing problem.

Since no tap gets hot water, chances are good the problem lies in the hot water pipes between the water heater to the first Tee.
Look for sediment lodged in water heater hot water pipe.
Or sediment lodged in elbow or Tee.

Other problems can be in play.
Faulty check valve or mixing valve if these are installed.
Faulty recirculation system if this is installed.
Also crossover at single-handled faucet where the cartridge is bad and lets the cold water flow into hot water pipe whenever another faucet is turned on. If you are getting cold water out the hot tap, and you know the hot water heater has hot water, then crossover is suspect > in addition to sediment blockage at hot water heater.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 15, 2011 | Rheem Water Heaters

1 Answer

Our rheem pronto tankless rutg-74xp red light will come home indicating hot water and stay on about 2 minutes and then turns off we have turned off and back on and let water run for 5 minutes and will come...


Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

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2 Answers

Water doesn't flow from the hot side. Was really cold last night. Is there a way to get it to flow?


Hi,
Yes... the water pipe is probably frozen... take a hair dryer and focus the heat on the piping...moving it back and forth along the piping to thaw it out...

heatman101

Feb 03, 2011 | Water Heaters

1 Answer

Hot water tank does not work when shower is on, it does however work when the faucet in bathroom is on. It quit working in the shower about a month ago.


  1. COLD MIX, HEATER DEACTIVATES
    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
  2. FLUCTUATING WATER PRESSURE
    If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate. The minimum water pressure for the home should be 30psi or greater. For people on well systems the minimum pressure range is 30-50psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant water pressure to the water heater. Watts brand 25AUB- ¾" or N35B-¾" pressure reducing/regulating valves or equivalent is suggested.
  3. CHANGING FLOW RATE
    Major changes in flow rate can adversely affect the output water temperature of the heater. Increases from one major fixture running to multiple fixtures running at one time can cause the temperature to fluctuate. Stay within the heater's specifications. See: TWH E2-03 Outlet temperature vs. flow rate [PDF].
From the Bosch website.

Good Luck,
Gary

Dec 16, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

My hot water pressure has been reduced to about 40% of what it used to be / or what the cold water pressure is. Does not appear to be a blockage in pipes, as pressure is the same at all hot water faucets...


You should check the inlet filter. Most (if not all) tankless heaters on the market have a small wye strainer on the inlet cold water connection. If debris build up in this, the water flow will be restricted.

Other than that, I'd check aerators at your fixtures, and if possible check the outlet pressure on the hot side of the tankless. If you have isolation valves, you can just run the water straight through. If the flow is restricted at the tankless, then you know the problem is in the heater or in the cold water supply. If the water flows quickly out of the tankless, then your problem is a clog in the water system after the heater.

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1 Answer

Rinnai gas water temperature keep alternating from hot to cold


A fault often found with these units is due to insufficient water flow. Usually this causes specifically the shower to run hot and cold. Try turning on more than one hot supply; if this fixxes the fault you will need to try and increase water flow. Most new tapware/showerware have water flow restictors built in. These are the cause of many problems with continous flow heaters such as the Rinnai. In taps they are usually located in the spout if it unscrews. In showers try the shower hose. Find them and take them out. Also make sure your mains supply to the house is on full.
There are more technical faults but this is something you can easily try first.

Aug 23, 2010 | Bosch & Tankless LP Hot Water Heater

2 Answers

After water to house was shut off, my Noritz tankless water heater is on but won't produce hot water. On the unit, the light indicating that the burner is on stays off now.


you probably had debris get into the filter or flow sensor when the water was turned back on. I'd recommend checking the filter first and if that doesn't work, call Noritz Tech support to help you with the flow sensor.

the filter is a black plug located on the cold water line (labeled cold on the bottom of the unit). It points torwards the left.

Apr 14, 2010 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

1 Answer

Can't regulate water temperature


Slower the flow hotter the water is how it works . Sounds like the water section is blocked and could well need cleaning out . Draw back with this system is you need a good inlet flow and flow will drop when you open other taps . they are good for a small house a family house not that good . Not much you can do put in a bigger water inlet to heater ?

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