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gyl rodriguez Posted on Feb 16, 2013
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Bosch 125fx heater barely heats water

It's about 4 years old, does leak at the valve. is it worthit to replace the water valve, or should i just replace the heater? we have hard water with some rust. recently installed a filter before the heater, which helped for a brief while, and i have descaled the unit yearly.

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Gene Haynes

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  • Water Heaters Master 5,391 Answers
  • Posted on Feb 17, 2013
Gene Haynes
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Joined: May 07, 2012
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1) Recommend replacing tankless with ordinary tank-type gas water heater.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://hometips.me/Mar/Which-is-best-gas-water-heater.pdf

2) Tankless cannot be exposed to more than 11 grains hardness in water or unit will fail within 2-5 years. Water softener is required.
http://hometips.me/Tls/Battelle_Water-softening-research.pdf

3) Descaling tankless water heater each year will not restore functionality, or restore efficiency of tankless, nor restore full efficiency to tank-type gas water heater.

4) Bradford White side-by-side testing research comparing their tankless with their tank-type shows that tankless will save $1-8 per month on energy bill vrs ordianry tank-type ....but conclude that tankless 'fall far short of payback' due to maintenance, repair, installation and replacement costs.
Study compared full cost, and not just monthly energy bill, since All costs are energy.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

5 Related Answers

Steve Archer

  • 148 Answers
  • Posted on Jan 09, 2009

SOURCE: Hot water heater leaking at the top valvue

I believe the problem you had with the pop off valve is a one time thing since you said you just installed the water h eater

The pop off valve is a pressure relief valve that is activated by build up in the tank from excessive pressure either through too much heat or pressure which works by pressing aginst a spring loaded valve


If you go to the whater heater and look at the valve ther is a handle on it take your hand (stand clear of valve opening) and slowly pull it you will see water start to come out

More than likely a new valve could have had a piece of debris in it or was partially open
re
If the heater was overheating the valve would stay open and you would see extremly hot water rushing out

I do not recommend that you replace the valve unless it continues


Good luck to you




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Anonymous

  • 245 Answers
  • Posted on Apr 19, 2009

SOURCE: I have a whirlpool water

call whirlpool and tell them ur problem.....i am sure they will help you

Anonymous

  • 1 Answer
  • Posted on Jan 21, 2010

SOURCE: GE gas water heater lights for only a few seconds.

Called GE and there is a glass vile under the burner that is defective and cuts off the oxygen.
They are mailing out a replacement to my house & have contracted a plumber to install. waiting 4 days now. They say that the glass vile incinerates and there is not any thing left to it. The burner area is full of black soot. will post again one fixed.

Testimonial: "This is an accurate description of my own follow up. That device, a TRD, was the indeed the problem. "

Anonymous

  • 50 Answers
  • Posted on Jul 19, 2010

SOURCE: I have a GG40T06/487-246 GE SmartWater Water

A 10 year old water heater is at the end of its life expectancy. No sense replacing a gas valve to have the tank rust out next month. I'ld replace the whole unit. Also, install a drip pan, under it and a WAGS safety device. Any water in the pan and the WAGS will shut off he Water and Gas. If your water heater has an expansion tank near by, replace that too.

Anonymous

  • 1 Answer
  • Posted on Feb 04, 2011

SOURCE: RHEEM 40 GAL ELEC TALL Water Heater 6YR SC 82VH402: my rheem 81sv40d water heater quit heating water. ...

I have the same problem about every 3-4 months. Mine is also about 10 or 11. It is usually the sediment at the bottom that causes this. Once the plumber flushes it, it works again. My problem is that I dont know how he did it and the vavle is at the floor level. I am never home when it is repaired. Regular maintenance (flushing) is how you avoid this from reoccurring. That is, if that is the cause of your issue.

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How to light the pilot light in a bosch aquastar 125 fx ng tankless water heater

I have the same machine first they said replace the micro switch i did then rebuild the water valve did not enough gas presure had it checked revented the unit the unit is brandnew relubed the water valve idk
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Bosch aq 125 no water preasure

Clean water filter yearly or monthly. Page 16 example manual.
http://waterheatertimer.org/pdf/Bosch-125BO-NG-LP-outdoor.pdf
Shut off the installer supplied cold water supply valve.
Disconnect water pipe going to the back of the water
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filter and inspect for damage. Replace if the filter is at all
damaged. Inspect the top of the water valve for signs of
a water leak or corrosion. If present, rebuild the water
valve.
Bosch service bulletins:
http://www.bosch-climate.us/bosch-hot-water/aquastar-service-bulletins/38b-125-series-bulletins.html
Descale heat exchanger yearly.
http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Bubbling water at pressure releaf valve on top of valve. valve is rusted. rusty water in pan. Unit was installed new two years ago. Offer suggestions. Thanks

Rusted water usually means anode rod depleted and tank is rusting. Change 570241 anode rod every year or so.
Boiling water could mean bad thermostat causing run-away heating so water is released out of TP valve. Replace 994062 thermostat for 4 gallon.
Leaking water at TP valve could mean bad TP valve: replace TP valve with generic valve from hardware store.
Open link for diagram, parts and replacement information
http://waterheatertimer.org/pdf/Bosch-GL_English.pdf
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My aquaStar 125 BNG,will not shut down automatically when water turned off.

The water valve may be dirty and sticking, prohibiting it from fully closing the gas valve. This part needs to be periodically serviced (every 2-5 yrs depending on water quality and use) Purchase a water valve rebuild kit to service water valve.
This answer is off the Bosch site.
If this answer is not satisfactory, do not feel obliged to accept it!
Gary.
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There is likely an onboard relay stuck in the open position.

This is a gas appliance and should be serviced by an authorized BOSCH repair center to avoid potential catastrophe.


Thanks!!
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Probably excessive winds caused a draft to enter your boiler via the flue and blew your pilot out - not unknown - if the unit is now working okay - don't worry. As you seem to be servicing the unit you will probably get a good many years out of it yet.
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There are several sensors for this. The other possibility is that the solenoids for the gas are failing. Does it go to pilot at all?
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Aquastar 125b ng: after 2 years of use water is not hot enough

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You have to fix this leak around the water valve before
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1. Close the water supply valve going to your tankless
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2. Unplug or close the natural gas valve.
3. Now, you can work fixing the leak.
4. Once completed, you can proceed to open the
natural gas valve as well as the water supply valve.
5. Then, have it tested to get it done.

5.

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