Question about Bosch Water Heaters AquaStar 125 series Outdoor Gas Water Heater - 125BO

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Can I convert an AquaStar 125BO convert from LP to NG

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Yes you can buy a con/kit expert job dont tackle

Posted on Oct 11, 2009


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Bosch aq 125 no water preasure

Clean water filter yearly or monthly. Page 16 example manual.
Shut off the installer supplied cold water supply valve.
Disconnect water pipe going to the back of the water
valve. Remove filter from back of water valve. Clean the
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
Bosch service bulletins:
Descale heat exchanger yearly.

Sep 29, 2012 | Bosch Water Heaters AquaStar 125 series...

1 Answer

Black soot on outside wall above hot air exhaust. Excess flame, incomplete combustion? How to adjust/correct?

All gas water heaters, tankless and tank-type, require cleaning burner and combustion parts.
Tankless manuals suggest once per year.
Tank-type once every 2-3 years.
Before calling service technician, open following links for Bosch troubleshooting resources:
Burners do not operate cleanly:

Jun 26, 2011 | Bosch 125BO NG AquaStar Outdoor Natural...

1 Answer

Water not hot enough

Check the temperature control knob first. It is located under the main cover near the bottom. Some of these water heaters can be very sensitive to water pressure also, Is your pressure steady or erratic?. There is a owner's manual pdf on the internet if you do not have one. Just type in Bosch water heater aquastar 125bo and when you find the correct site, click on the words that say literature. Take care.

Feb 23, 2011 | Bosch Water Heaters AquaStar 125 series...

1 Answer

My aquastar 125b ng froze in cold weather and spewed water everywhere. when installes I was told it was ok to have this unit on outside wall. ... any suggestions

Generally speaking, tankless water heaters should not be installed on an outside wall, especially if they are masonary (which lose more heat to the outside) - regardless of what the installer told you. If the wall reaches & goes below the freezing point, so will the water pipes supplying the heater. However I am somewhat surprised that the heating element did not compensate, if indeed it was the heater that froze. I would recommend moving the heater to an interior wall if possible. You may also want to check the thermostat setting as well.

Dec 09, 2010 | Bosch Water Heaters AquaStar 125 series...

1 Answer

I have been getting both the FA and F7 fault codes come up day after day. I don't think it's the wiring, and I don't think both the gas valve and Ionizing components are both faulty, especially since it...

You would need to check that you have the correct burner pressure that would be part of the conversion. Its NOT all ways pre-set as some think to the correct pressure .

May 29, 2017 | Bosch 2400ES LP AquaStar 6.4 GPM Indoor...

1 Answer

I need to convert this water heater to natural gas. Is there a kit available to do this?

No kits are available to convert his unit to NG. This is because the LP uses copper pipe and is within code, the NG uses black pipe and each unit is specifically designed, entirely, to use the gas associated with the unit.

Feb 05, 2010 | Bosch AquaStar Propane Tankless Water...

1 Answer

Bosch Aquastar 2400E LP Does Not Heat Water

Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Nov 10, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

No hot water

Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

Mar 01, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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One of the burner jets on my bosch 125bo unit is yellow (vs. blue) so I assume I have something clogging it, how do I get at it? Is there a repair manual for these units?

they make a long stem wire brush for this,, you will need to go to a plumbing supply house to get one turn it on and gently rub it over the burner make sure it is lit so the pressure from the gas will blow out what is there good luck

Jan 14, 2009 | Bosch AquaStar 125BO-NG 125BO Outdoor...

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