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

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Pilot blows out on n.g. tankless water heater when it's windy

It only happens when the wind is really blowing outside. I reach in to relight the pilot and I feel a a lot of draft. It will come on after I relight the pilot but it won't stay on and I watched the pilot while it happens and it looks like the pilot gets sucked out. Once that happens the burner flames go off. Safety precaution because I do smell carbon monoxide when it happens. We thougth we had this well vented but it seems like we need to stop some of the wind from coming down the pipe when it's windy and we are using it. It only happens when it is in use.

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  • blueextc3221
    blueextc3221 May 11, 2010

    Carbon Monoxide is odorless. You are smelling unburned Natural gas in the regulator.

    Check that the vent is not CLOGGED (with animal now debris) - so there is a defficiency of fresh air for the pilot.

    As a temporary fix - position a tarp around the vent opening blocking the wind. If this helps, then install a diffuser at the end of the vent pipe that will not allow wind to enter.

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Hi. I have a tankless water heater that Bosch says they manufactured. It's point-of-use under the kitchen sink. It services the kitchen sink, dishwasher and the bathroom sink and shower. (We live remotely...6 miles from town). It's a little house. Anyway, the unit was installed in late 2005. It's blown the flex water pipe, now twice - once was this afternoon. What's going on? I was hand washing a few pots, smelled ozone and heard wooshing and hammering noises under the sink. After contacting Bosch's technicians, the water hose to the hot side blew completely off, spraying the kitchen with water. Big mess. I don't know what to do about this, this is the second time it's happened.
Any ideas? (By-the-way, Bosch said it was installed incorrectly because the guy that installed used a pig-tale instead of hard-wiring. It's been working all this time...now I'm afraid to leave it alone).

Posted on Jul 08, 2009

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There are many anti-back-draft systems on the market, but there may be only a few that could possibly be Incorporated in to your application. You might contact the manufacturer for their product list of, flue pipe anti-back-draft devices.
Good luck...

Posted on Feb 23, 2009

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Posted on Jan 02, 2017

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Would high winds and rain cause pilot light on a rannai tankless water heater to go out?


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High winds can cause reversal of air flow down vent pipe causing pilot flame to blow out.
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Have plumber check natural draft up vent pipe.
Other things can cause same problem, for example if vent fan is located in same room as water heater, or house is tightly insulated, and vent fan is ON, then it will draw air down the water heater vent and blow out pilot.
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Fact that pilot will not relight, indicates other factors at play.

Open following link for Bosch troubleshooting resources including manual, and Bosch contact info:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Best place to start is your manual.
http://waterheatertimer.org/pdf/Bosch_10P-installation.pdf

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Fixya is always less expensive than a service call.

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Hello,
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