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Ideas about strange behavior of Bosch 250SX Tankless?

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Ideas about strange behavior of Bosch 250SX Tankless? Dave S 04-11-2006
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Posted by Dave S on April 11, 2006, 10:56 pm
If anyone has seen the following mystery problem in a natural gas water
tankless heater before and knows the fix, I'd be grateful to hear it.

When cold water is run, the unit's exhaust fan goes on briefly after the
cold water stops. This fan is supposed to run a few seconds after the
hot water is turned off to exhaust gases from the burner unit.
The fan is not supposed to run when cold water alone is run.

A Bosch-recommended plumber installed the unit. Bosch told the installer
it had not heard of this problem before.

The installer added a "water hammer arrester" on the cold pipe leading
into the unit. This did not fix the problem.

Bosch has offered to send out a new water heater. We are trying to avoid
this costly step as we don't know if it is defective. It heats water
just fine.

Dave
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Posted by on April 11, 2006, 11:41 pm
On Tue, 11 Apr 2006 21:56:13 -0500, Dave S

>If anyone has seen the following mystery problem in a natural gas water
>tankless heater before and knows the fix, I'd be grateful to hear it.
>
>When cold water is run, the unit's exhaust fan goes on briefly after the
>cold water stops. This fan is supposed to run a few seconds after the
>hot water is turned off to exhaust gases from the burner unit.
>The fan is not supposed to run when cold water alone is run.
>
>A Bosch-recommended plumber installed the unit. Bosch told the installer
>it had not heard of this problem before.
>
>The installer added a "water hammer arrester" on the cold pipe leading
>into the unit. This did not fix the problem.
>
>Bosch has offered to send out a new water heater. We are trying to avoid
>this costly step as we don't know if it is defective. It heats water
>just fine.
>
>Dave
>

the choices are obvious Dave. you get what you pay for.

pay your attorney to ensure Bosch warrantees their product

or do nothing and live with the imperfections.

Posted by Dave S on April 12, 2006, 8:33 am
> the choices are obvious Dave. you get what you pay for.

the Bosch units are more expensive than the tank type, about the same
price as other tankless units by Rheem. Based on this experience, I
would not recommend one, even with the current federal rebates, energy
savings.
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Posted by on April 12, 2006, 12:14 am
On Tue, 11 Apr 2006 21:56:13 -0500, Dave S

>If anyone has seen the following mystery problem in a natural gas water
>tankless heater before and knows the fix, I'd be grateful to hear it.

        alt.home.repair, not here


>
>When cold water is run, the unit's exhaust fan goes on briefly after the
>cold water stops. This fan is supposed to run a few seconds after the
>hot water is turned off to exhaust gases from the burner unit.
>The fan is not supposed to run when cold water alone is run.
>
>A Bosch-recommended plumber installed the unit. Bosch told the installer
>it had not heard of this problem before.
>
>The installer added a "water hammer arrester" on the cold pipe leading
>into the unit. This did not fix the problem.
>
>Bosch has offered to send out a new water heater. We are trying to avoid
>this costly step as we don't know if it is defective. It heats water
>just fine.
>
>Dave
>*** Free account sponsored by SecureIX.com ***
>*** Encrypt your Internet usage with a free VPN account from
http://www.SecureIX.com ***

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Posted by Dave S on April 12, 2006, 9:32 am
> >If anyone has seen the following mystery problem in a natural gas water
> >tankless heater before and knows the fix, I'd be grateful to hear it.
>
>         alt.home.repair, not here

Earlier, I did get a thoughtful response via alt.home.repair, but that
idea did not solve the problem. Since this is a problem related to a
power vent, I'm hoping someone in the HVAC end of things might have
dealt with this before.
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