Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

1 Answer

Luke warm water

Our Bosch 125HX LP water heater used to work fine. Now the water out is luke warm. The pilot lights, the burners come on, but the flame is only about 3/4" high. I replaced the rod assembly in the water valve (we have very hard water), but to no avail. Any suggestions?

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  • tbroberg Aug 10, 2013

    After rebuilding the water valve, because it has been a few years and we have *seriously* hard water here, I couldn't think what it would be short of a gas supply issue, which is out of my league.
    Sure enough, the gas regulator was bad, resulting in low gas pressure house-wide.
    Thanks to all for your thoughts on the issue.

  • tbroberg Aug 10, 2013

    After rebuilding the water valve, because it has been a few years and we have *seriously* hard water here, I couldn't think what it would be short of a gas supply issue, which is out of my league.
    Sure enough, the gas regulator was bad, resulting in low gas pressure house-wide.
    Thanks to all for your thoughts on the issue.

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  • Expert
  • 43 Answers

Is the water temperature dial turned up? or even functioning?

Posted on Jul 28, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 25 Answers

SOURCE: Bosch AQ125BNG gas water heater

First thing I would do is clean and rebuild the watervalve. The watervalve on this heater mandates everything. This watervalve has a maintenance schedule in the manual. She be rebuilt every 3 years. Also sounds like the diaphram in the watervalve may be damaged.

Posted on Jan 19, 2009

co7196
  • 3433 Answers

SOURCE: no hot water, pilot light lights but no burner ignition

Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

Posted on May 06, 2009

gary1121
  • 332 Answers

SOURCE: bosch hot water service 16p burner shuts down

a tankleess water heater doen's have a piliot? but check the vent outside make sure nothing is blocking it, if it detects the exhaust thru the cold air intake it will shut off and over heat, other then that it would have to be the control board

Posted on Jun 06, 2009

co7196
  • 3433 Answers

SOURCE: The Pilot burner flame is large & yellow

the pilot is getting too much air and is an indicaiot of dirty or air/ fuel ratio imbalance. The pilot is wimpy and the thermocoupler has alot to do with the gas . Make sure your thermocoupler is on the tip of the flame. You may end up replacing it. because it is showing signs of eminnt failure. When it fals your curners won't fire up. Good luck.

Posted on Jun 09, 2009

mrhotandcold
  • 248 Answers

SOURCE: we have a 3 year old Bosch GWH 425 HN tankless LP

suggest you complain to Borch sometimes lemons get through best of luck

Posted on Oct 30, 2009

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No hot water, pilot light lights but no burner ignition


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