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Scalding hot water from cold tap for short while, then cold.

I had a similar problem in an apartment some years ago. You could turn on the COLD water side and HOT water would come out for a brief period, then go cold as expected. Sometimes it would be extremely hot. I think I measured it at over 100 degrees F once.
Only thing I could think of what that the cold water pipes and hot water pipes were touching somewhere and the heat was being transferred and heating up the cold lines.

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  • jmb1977 Jun 16, 2009

    Bah, this was supposed to be a comment on another's problem...
    we need a way to delete problems that were created by mistake.


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Sounds like you have a hot water leak un der your foundation.

Posted on Jun 16, 2009

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Hot water heater has hot in tank but dose not come out of hot water line on tank


most electric hot water systems use a heat transfer process where the element is in one tank and the house water is in another
the house water is what is being drawn off when you turn on a tap
there is a regulator valve at the top of the tank with a small lever that you open up to let water in and air out of the system
another point is that there may be a hot/cold mixer on the hot water outlet which limits the temperature of hot water to prevent scalding injuries in the bath and shower or sink
If you have one fitted they are known to malfunction and cut the hot water temperature down as, they mix too much cold water into the hot water pipe.
have a plumber check it out

Jun 13, 2015 | Water Water Heaters

1 Answer

Getting really hot water to the kitchen but only tepid hot water into the bathroom and ensuite. Do not need to put on the cold tap at all in the bathrooms but you can't hold your hand under the tap in...


If some taps have really hot and others luke warm, then you might have defective mixing valve, check valve, or crossover on single handled faucet.
http://waterheatertimer.org/Crossover.html

Crossover can also cause stacking event. Stacking could be part of puzzle.
http://waterheatertimer.org/Stacking.html

Once crossover or check valve or mixing valve problem is solved, if you have really hot water to some taps, then turn down thermostat to avoid scalding.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Add a comment for more help.

Jun 13, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

My reliance natural gas water heater overheats causing scalding water to come out of my faucets. I have had authorized service companies come out three times to replace and retrofit different controls and...


Information below is for tank-type electric or gas heater only.

There is a condition called stacking.
This might apply to your water heater or not.
Having authorized service people to your house 3 times suggests more complicated mix of problems.

Stacking is caused when there are repeated short draws of hot water.
As you know, each time any hot water is drawn out of faucet, cold water immediately enters bottom of tank through the dip tube. The dip tube is connected to cold water inlet and runs to bottom of tank.
So all cold water enters bottom of tank close to the gas water heater thermostat.
See illustration of dip tube, that also shows copper thermostat sticking into tank that is connected to gas valve.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html#flushelectric

Let's say your water heater if fully heated and burner is off.
A short draw of hot water causes cold water to enter tank.
Another short draw. And then another short draw, each draw happens close to same time as other draws.
Water at top of tank is plenty hot, but bursts of cold water get near thermostat and cause thermostat to turn on burner.
Burner heats water and more hot water rises to top of tank. Water at top of tank becomes overheated each time stacking occurs.

Again, a stacking situation may not be the cause of your problem.
However, remember if single-handled faucet is opened straight upward, then that draws both hot and cold water. And cold water immediately enters tank.
Only when the single-handled faucet is lifted with the handle all the way to the right, does it draw only cold water. Even so, some single-handled faucets have bleed-over between hot and cold sides, so hot water is drawn anyway.

Another possibility is that the dip tube ends at or near thermostat, instead of going all the way to bottom of tank. The dip tube should go straight down from cold water inlet, but dip tubes are made of plastic, and some self-cleaning tanks have a curved dip tube or dip tube with perforations that create currents designed to stir sediments off bottom of tank (although this is not proven to be effective deterrent to sediment formation).

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

Feb 10, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

I have a hotpoint hot water heater it's about 6 years old. When I turn the hot water on it runs very slowly the water pressure is very low and it's like this throughout the house how do I fix this problem...


You have clog in the water line.
Since all hot water pipes are involved, clog is probably near water heater.

Buy pressure gauge at hardware store that threads onto hose connection.
Brady BTG 100 at Amazon
Picture of gauge

Check outdoor pressure for baseline pressure in your home.
Turn off electricity to hot water heater for an hour or two so there is not scalding water.
Open drain valve on water heater to see if water heater is clogged with sediment.
http://waterheatertimer.org/Water-heater-will-not-drain.html

Put pressure gauge on drain valve and compare with outside pressure.
Open hot water spigot on bathtub and see if tank pressure drops ... if tank pressure drops significantly with bathtub spigot on, then clog is on incoming cold water before tank, and could be on outgoing hot water pipes too.
If tank pressure stays about the same, then clog is on outgoing hot water pipes.

Clog can be sediment caught in cold water shut off valve located above tank. Open and close valve and test pressure again. Take apart incoming cold water pipes above tank and check for sediment. Replace valve. Look at condition of cold water nipple on top of tank.

Sediment caught at hot water elbow near tank.
Sediment can fill up old pipes. Take apart hot water pipes above water heater and see condition.
Look at condition of hot water nipple on top of tank.
You may have to take apart pipes up to first or second elbow.

Pipes can decay at joint where copper pipe connects to galvanized pipe. Check for copper to galvanized connections on cold or hot pipes and replace section of galvanized pipe. Copper pipe will probably be good, the galvanized pipe will deteriorate. Replace copper-to-galvanized joint with 3/4" non-conducting union from hardware store

Dec 06, 2010 | Water Heaters

1 Answer

Hi i have installed a few bosch gas geysers at our lodge in mozambique.The problem is that the water gets hot when we turn the water on then the heat just shuts off and the water gets cold after a short...


The problem with all that type of water heater is that once the hot tap is turned on sufficient flow must be maintained through the water heater to keep the main gas burner alight. If the heat adjuster is turned up to high, then the person using the hot water will turn it down to a low rate which means the main burner will turn off and result in cold water. Try setting the heat control to the lowest setting that still gives hot enough water. If you have a thermometer adjust control for a temperature of around 50 to 55 degrees Celcius. You may have to fiddle with fine adjustments to get the temperature and flow rates to maintain a constant output of hot water. You may still have intermittent problems. If the heater only supplies baths or showers you could set the temperatuer even lower (45 to 50) to ensure that the hot tap is used more than the cold which will maintain flow and therefore heat.

Nov 22, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

Hello we have Bradford hot water tank model #MI65R6DS13. Our problem, I keep having to press the tanks reset switch for us to get hot water. At the same time after I press the reset switch we have hot...


No the top thermostat is the first place I would start to replace. They run about 14.00 more than likely it isn't controling right. Turn power supply to water heater off and replace thermostat.

If you was getting scalding hot and then turning cold without tripping the thermostat it would be the top element working and the bottom one bad.
Bottom element good it will give you luke warm water for a while then gradually turn cold because it's heating the bottom of the tank.

Hope this will help you out.

Oct 09, 2010 | Fasco Bradford White Hot Water Heater...

1 Answer

Hello, I purchased a Bosch model # GWH G35 ES N about 4 years ago and have continuous problems with the sensors. I've replaced the hot side outlet sensor #0711 at least 4 times and the cold side # 0616...


the main problem is...

you purchased a "Bosch" Aquastar.... complete garbage

if you want quality tankless..
Takagi, Rinnai, or Noritz. these are the only tankless I install or work on, very few if any problems.
just look on the board here, most of the problems listed are with the Bosch

Jul 10, 2010 | Bosch Water Heaters

1 Answer

I am not getting any hot water, only cold water, when I run my hot water taps. I have an Ariston Bravo water heater. Normally I have permanent hot water at any time. My central heating seems to be...


Sounds like the by-pass valve diaphragm. This valve detects that hot water is being drawn off at the tap and then diverts the mains input water across the heat exchanger. Very often it's the diaphragm inside the valve which is punctured or split.This can be replaced [depending on model] if you take apart the valve
. Remove the front panel and lower the control panel.The valve is at the bottom left of the boiler
Suggest turning off the service taps to the two heating pipes and the cold mains inlet pipes before tackling the valve

Mar 20, 2010 | Water Heaters

1 Answer

Water becomes ice cold in the middle of a shower


Sounds like you have a problem with water flow. Since your ground water is warmer in the summer, you mix less hot and more cold in order to get the same warm temperature. If your hot water flow gets low enough, your tankless will start to "short cycle" in order to prevent scalding. Use one of these three methods to increase your water flow at the shower:

1) Clean your shower head and descale
2) Widen the hole in the showerhead's flow restrictor
3) Remove your flow restrictor entirely

Good luck!

Jan 24, 2010 | Noritz NORTIZ Outdoor Propane Tankless...

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 ?

Mar 10, 2017 | Bosch AquaStar Indoor Natural Gas Tankless...

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