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

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Sings when producing hot water

Mya Bosch Aguastar tankless sings some time when it is producing hot wat

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It is a loose washer in a valve,,, when the water hits it just right it makes the sound,, either check the valve by turning it on and off while water is running that will let you know wich one it is

Posted on Jun 06, 2009

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Posted on Jan 02, 2017

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Water heater ringing


What do you mean ringing? Is it gas or electric? tankless? when does it ring? when its hot? when its being used? when it shuts off? Need more info to help you.

It sounds like you have an electric water heater and it kinda sings in a high pitch? If so thats the element heating up and thats usually not a big problem. Some times it can be a sighn thats the tank needs to be flushed or the element going out. But time of year it just the water comming into the water heater is just a lot colder than in the summer time and the heater has to work harder to heat that colder water.

Jan 10, 2013 | Water Heaters

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The thermal cutout pops on tank two after it shuts off. It boils then shuts off. It also turns off when taking a shower, producing cold water. I checked the ohm readings on the thermal cutout and the...


Question posted under Bosch tankless.
Question says 'tank'
Brand, model, and type heater unknown.
Elements mean electric.
'Thermal cutout pops when taking shower produces cold water' indicates tankless, since tank-type would maintain some hot water.
No error code might indicate tank-type.
Add a comment with type, brand and model number of heater for possible assistance.

Sep 24, 2012 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

I have a Bosch GWH 425 HNO propane Tankless Water Heater which began intermittently exploding when demand for hot water occurs.


Call a qualified service tech immediately.
Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.

Aug 14, 2012 | Bosch & Tankless LP Hot Water Heater

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WATERHEATER 45 550301 NO HOT WATER


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

Apr 08, 2011 | Bosch & Tankless LP Hot Water Heater

3 Answers

Bosch aquastar Aq125-hx does not produce hot water. Pilot is ok. Gas and Flame heat is ok. water pressure is ok. Just no hot water getting to the faucets. Help.


That particular tankless water heater has hydro-generated ignition. In order for it to function, it requires a certain water pressure and velocity. You can try turning on the hot water in two location in your house to see if that gets it started. If it does, try getting a higher flow shower head, or removing the limiters in your faucets.

Jan 07, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

Bosch tankless hot water heater: Confort TOO HOT!!!


Look for a water temp control on unit. Otherwise a lower temp can be attained by having a higher water flow to minimize temperature buildup in heating coil.

Sep 06, 2017 | Bosch & Tankless LP Hot Water Heater

1 Answer

Cannot get hot water


Make sure breaker is turned on. If that isn't it tell me model number and maybe I can help you more

Feb 07, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Not producing hot water


the only time it's the valve is when you loose pressure on the hot side of any faucet, depending on the age of it you could just call the company bosch and they will tell you how far away a real tech is from you and contact them for you, you do have a 1 year labor 5 year parts warranty with the tankless unit, for you I hope you are within your warranty,,,, if not change it to a rinnai system the will send people to you if you have a problem

Jun 05, 2009 | Bosch AquaStar Indoor Natural Gas Tankless...

2 Answers

Is there alot of problems with bosch aquastar 2400


Bosch has had problems with these heaters for sure. They are the best known thing out there in the market.They are mostly responsible for the bad rap being given to all tankless heaters, but a big part of the problem is installation. They are being sold to homeowners at box stores as DIY kits. These are not units to be homeowner installed, venting and fuel requirements are different from regular heaters and they will not function correctly if improperly installed. I have installed several of the Rannai units over the past few years without any issue whatsoever.

Mar 10, 2009 | Bosch AquaStar Indoor Natural Gas Tankless...

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