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Posted by daestrom on December 28, 2008, 8:32 pm
 
Eeyore wrote:

<snip>

Just consider, we 'inherited' many of these units from Europe in the
eighteenth and nineteenth century when there were many great advances in
basic physics.

After all, who was Fahrenheit?  A German.

And who came up with 'British Thermal Unit'??  I don't think it was a
Frenchman :-)

Maybe we're just nostalgic for the original units used to measure these
things?

daestrom




Posted by Eeyore on December 30, 2008, 12:36 am
 


daestrom wrote:


Maybe we decided to move on to better things ? Or then again it could
explain why much US engineering is no better than 18th or 19th century even
today ?

Graham


Posted by ransley on December 27, 2008, 1:39 am
 On Dec 25, 5:07pm, humphil...@yahoo.com wrote:

I have a Bosch 117000 battery ignition vented out a wall, with 6ft of
chimney it wont freeze at 20f outside but I would not go to zero, It
will heat 25f incomming to a hot shower being set to maybe 80%. Gas
supply must be right or btu wont be achieved. I have a 1/4 turn ball
valve drain at top and bottom, so its quick to drain, no resetting of
controls and it was 475$ US. For freeze protection you need AC and
maybe alot of it. In Mexico everyone had 6 gallon tanks with big
burners that work. A tankless with freeze protection wont be cheap but
effect can be reduced with long semi horizontal exhaust. Is it going
into the same chimney as your heating system or no chimney. True
direct vent is condensing and costs thousands like the Takagi TK1
which is also the highest efficency of near 96% on propane, mine is
82%, but large Ng Tank is 55-65 avg E.F. Energy Factor. All are rated
at  www.energystar.gov
Do you have AC, if propane is a a problem a mini electric tank, if you
have 120a extra a tankless Bosch is a one use system. Ive even seen
cheap 15-30a under sink units do well at a sink. Freezing a Ng-propane
tank coil could be a concern, but to pay to keep it thawed a waste. Do
you have grid AC of high amps. I would think there are wood burning,
and solar options also.

Posted by humphill40 on December 27, 2008, 8:14 pm
 Heh Ransley,

25 degrees ground water is pretty unusually cold! How cold does the
room you have heater in get at night? Glad to hear 20 degrees outside
is safe, at least at your room temp, but do you get below 20 outside
often so you have to drain it anyway?. Bosch manual says you must also
use compressed air to fully drain it but that seems overdone to me.
surely if tubes are partially empty then they can't break. What
problem did you have with gas pressure? I'm guessing your tank was too
small for cold temps. I'm  hoping that i can empty a 50 gallon when
running 177k btu  at 30 degrees but who knows?

Milo

Posted by Eeyore on December 28, 2008, 4:45 am
 

humphill40@yahoo.com wrote:


Might help to state if you've become aware of the metric system or not, or
I'd certainly have to agree !

Grahama


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