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Subject Author Date
More on tankless water heaters David Nebenzahl 04-03-2008
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Posted by ransley on April 3, 2008, 7:36 pm
> On 4/2/2008 11:21 PM BobK207 spake thus:
>
> > better consider as well
>
> > o temperature of incoming water
> > o elevation (above sea level) of installation
>
> > if the incoming water is really cold (like sub 45) and / or
> > installation is in the higher elevations =A0(like the mountains) forget
> > about a tankless
>
> That's interesting; hadn't thought of that. So what do you think is the
> maximum practical elevation for a tankless to work properly?
>
> --
> The best argument against democracy is a five-minute
> conversation with the average voter.
>
> - Attributed to Winston Churchill

Its not thought, its fact, but these idiot "Tank" salesman are full of
BS. Research Temp Rise at the GPM you need.

Posted by BobK207 on April 4, 2008, 12:01 am
>
>
>
> > On 4/2/2008 11:21 PM BobK207 spake thus:
>
> > > better consider as well
>
> > > o temperature of incoming water
> > > o elevation (above sea level) of installation
>
> > > if the incoming water is really cold (like sub 45) and / or
> > > installation is in the higher elevations (like the mountains) forget
> > > about a tankless
>
> > That's interesting; hadn't thought of that. So what do you think is the
> > maximum practical elevation for a tankless to work properly?
>
> > --
> > The best argument against democracy is a five-minute
> > conversation with the average voter.
>
> > - Attributed to Winston Churchill
>
> Its not thought, its fact, but these idiot "Tank" salesman are full of
> BS. Research Temp Rise at the GPM you need.


Ransley-

Chill out.....I'm not a tank salesman but you sure seem like a
"tankless" cheerleader.


My point is that people considering tankless have to carefully examine
their installation so that it works for them.

Cold incoming water & elevation might be factors that could make or
break an installation

cheers
Bob


Posted by glen stark on April 3, 2008, 3:20 pm
On Thu, 03 Apr 2008 00:21:56 -0700, BobK207 wrote:

> better consider as well
>
> o temperature of incoming water
> o elevation (above sea level) of installation
>
> if the incoming water is really cold (like sub 45) and / or installation
> is in the higher elevations (like the mountains) forget about a
> tankless


Why does the elevation make a difference?

Posted by Oren on April 3, 2008, 4:47 pm
wrote:

>On Thu, 03 Apr 2008 00:21:56 -0700, BobK207 wrote:
>
>> better consider as well
>>
>> o temperature of incoming water
>> o elevation (above sea level) of installation
>>
>> if the incoming water is really cold (like sub 45) and / or installation
>> is in the higher elevations (like the mountains) forget about a
>> tankless
>
>
>Why does the elevation make a difference?

It's not a factor, as best I can tell.

Posted by Wayne Whitney on April 3, 2008, 6:14 pm

> On Thu, 03 Apr 2008 00:21:56 -0700, BobK207 wrote:
>
> > if the incoming water is really cold (like sub 45) and / or
> > installation is in the higher elevations (like the mountains)
> > forget about a tankless

Bob, rather than forget about the tankless, just bear in mind the need
to upsize the unit appropriately, of course that may make it less cost
effective.

> Why does the elevation make a difference?

Good question--it definitely makes a difference, boiler manufacturers
will have a high altitude kit to change the burner orifices to
compensate for the altitude. As to why, my WAG is that since the
natural gas is delivered at a particular PSI gauge (relative to
atmospheric), the absolute pressure delivered is lower, and so the
flow rate in moles/hour is lower. Plus the oxygen pressure is lower,
so the burners may need to be reconfigured to provide comparitively
more air.

Cheers, Wayne

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