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Rear venting Bosch 125 tankless water heater (vent height requirement)

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Rear venting Bosch 125 tankless water heater (vent height requirement) ian 07-11-2006
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Posted by ian on July 15, 2006, 10:45 am
El Barto wrote:
> >I want hot water when the grid's down, so trying to
> >make it work without powered vents!
>
> Umm...what about the power for the control electronics? Power vent or
> no, you still need electricty to make hot water!

The "HX" model uses a micro-hydro-generator to produce the electricity
needed. Quote: "When a hot water faucet is opened, the water flow
through the heater causes the gas valve to open. At the same time the
hydro-generator activates the electronics which sends a spark to the
pilot."


Posted by Derek Broughton on July 16, 2006, 11:32 am
El Barto wrote:

>>I want hot water when the grid's down, so trying to
>>make it work without powered vents!
>
> Umm...what about the power for the control electronics? Power vent or
> no, you still need electricty to make hot water!

Oh dear - I don't know how I'm getting hot water then! There's no
electricity involved in my Bosch tankless heater. The drawback is that it
only applies a fixed temperature delta to the incoming water, rather than
being able to output a fixed temperature, no matter what temperature the
input is (which is variable, as it comes from a solar water heater).
--
derek

Posted by DJ on July 16, 2006, 6:09 pm

Derek Broughton wrote:

> Oh dear - I don't know how I'm getting hot water then! There's no
> electricity involved in my Bosch tankless heater. The drawback is that it
> only applies a fixed temperature delta to the incoming water, rather than
> being able to output a fixed temperature, no matter what temperature the
> input is (which is variable, as it comes from a solar water heater).

The Bosch Aquastar 125 BS will do that. It was actually purpose
designed to work with solar water heaters.
And it also works without the benefit of electrical input ;-).

DJ


Posted by Derek Broughton on July 17, 2006, 9:44 am
DJ wrote:

>
> Derek Broughton wrote:
>
>> Oh dear - I don't know how I'm getting hot water then! There's no
>> electricity involved in my Bosch tankless heater. The drawback is that
>> it only applies a fixed temperature delta to the incoming water, rather
>> than being able to output a fixed temperature, no matter what temperature
>> the input is (which is variable, as it comes from a solar water heater).
>
> The Bosch Aquastar 125 BS will do that. It was actually purpose
> designed to work with solar water heaters.
> And it also works without the benefit of electrical input ;-).

Yeah, I really shouldn't have let my wife make all the decisions :-)
--
derek

Posted by on July 14, 2006, 10:23 pm

ian wrote:
> Hi-- I d like to to install a Bosch 125HX on an outside wall, and vent
> through that wall. But my initial vertical height plus 45=B0 leg back
> through the wall (which counts as vertical) don't quite make the 6'
> vent height Bosch recommends. Is it a performance or safety issue with
> a shorter vent? I want hot water when the grid's down, so trying to
> make it work without powered vents! Thanks. --ian

Ian,
Just for your information, I have a Thermar (no longer available)
tankless water heater. It uses a directvent. It exists out the back
of the unit with no vertical, using a zero clearance type pipe and
hood. It came as an LP unit and has now been converted to natural gas.
It uses no electric power to operate, except for the heater that keeps
it from freezing in very cold conditions. I am disapointed to hear
that their may be no equal to it available now. I bought spare parts,
it has operated flowlessly for 20+ years.=20

Jerry Arch


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