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Home > Archive > Alternative Power sources > October 2005 > BTU's in a propane bottle?? Anyone??
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BTU's in a propane bottle?? Anyone??
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| I can't do that Dave 2005-10-10, 8:21 pm |
| Hi,
I want to use a 10,000BTU wall mount, non vented propane gas heater
this year.
Can anyone tell me how long I could run it at full 10K output from a
standard BBQ gas bottle? Hours, days or weeks??
Thanks
| |
| Tony Wesley 2005-10-10, 8:21 pm |
|
I can't do that Dave wrote:
> Hi,
>
> I want to use a 10,000BTU wall mount, non vented propane gas heater
> this year.
>
> Can anyone tell me how long I could run it at full 10K output from a
> standard BBQ gas bottle? Hours, days or weeks??
>From http://science.howstuffworks.com/lpg1.htm
"A single pound of propane can generate 21,548 BTU (British Thermal
Units) of energy."
Standard BBQ gas bottle is 20 pounds. So a full tank has about 400,000
BTUs. At 10,000 BTU per hours, about 40 hours.
| |
| Tony Wesley 2005-10-10, 8:21 pm |
|
Tony Wesley wrote:
> Standard BBQ gas bottle is 20 pounds.
I just remembered, those new overflow devices limit the amount of
propane you can put in the tank. So a 20-pound tank now hold about 16
pounds of propane.
> So a full tank has about 400,000 BTUs.
> At 10,000 BTU per hours, about 40 hours.
Make that 320,000 and 32 hours.
| |
| Steve Spence 2005-10-10, 8:21 pm |
| I can't do that Dave wrote:
> Hi,
>
> I want to use a 10,000BTU wall mount, non vented propane gas heater
> this year.
>
> Can anyone tell me how long I could run it at full 10K output from a
> standard BBQ gas bottle? Hours, days or weeks??
>
> Thanks
>
LBS. Per Gallon of Liquid at 60ºF 4.24
BTU Per LB of Gas (Gross) 21591
BTU Per Gal. Liquid of Gas at 60ºF 91547
So, a 5 lb. bottle might contain 107955 btu. and run that heater for
approximately 10 hours ....
--
Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net
http://www.rebelwolf.com/essn.html
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"I can't do that Dave" <davenpete@gmail.com> wrote in message
news:1128983333.407062.203820@g44g2000cwa.googlegroups.com...
> Hi,
>
> I want to use a 10,000BTU wall mount, non vented propane gas heater
> this year.
>
> Can anyone tell me how long I could run it at full 10K output from a
> standard BBQ gas bottle? Hours, days or weeks??
>
> Thanks
You really want to use an non vented heater? Assuming an enclosed space, if
not "never mind"
Got your affairs in order and life insurance paid up?
| |
| Spanky 2005-10-11, 4:21 am |
| I can't do that Dave wrote:
> Hi,
>
> I want to use a 10,000BTU wall mount, non vented propane gas heater
> this year.
>
> Can anyone tell me how long I could run it at full 10K output from a
> standard BBQ gas bottle? Hours, days or weeks??
>
> Thanks
My usage for Sept in the Seattle area, 2100sq ft, leaning to the drafty side
of a 30 year old mobile heated with a 30K BTU non-vented (do have a CO
alarm) used 31.4 gallons of propane.
9/1 4.4 start
9/7 4.5
9/14 4.5
9/18 4.5
9/21 4.5
9/25 4.5
9/29 4.5
With those numbers I switched to two 100lb tanks to reduce the refill time
to hopefully bi-monthly. Tad on the heavy side when full but manageable.
Keeps this old drafty place nice and comfy at 70 degrees. Electric forced
air was running me 300 plus a month for eight or so months of the year. Wood
stove works but refilling is constant and something about one room at 100
degrees while the back rooms are 60 just seems a bit odd. Not to mention
that between chains and fuel to cut the wood propane is cheaper, much more
even heat, and no unwanted guest brought in from the wood pile, should of
done it ages ago.
Plan is to replace the ventless with a vented unit once a full season
passes. 30K is not enough to hold the temp up when it does get cold, or so
the math indicates. But that sizing will be determined by the consumption
data and my personal comfort.
Non-vented units are fine, just get a monixide detector, even a residence
using vented gas unit should have such safety equiptment. It is law that I
have to supply one for my rental, but only a recommendation for my own home.
Go figure.
| |
| Chris Hill 2005-10-11, 9:21 am |
| On 10 Oct 2005 15:28:53 -0700, "I can't do that Dave"
<davenpete@gmail.com> wrote:
>Hi,
>
>I want to use a 10,000BTU wall mount, non vented propane gas heater
>this year.
>
>Can anyone tell me how long I could run it at full 10K output from a
>standard BBQ gas bottle? Hours, days or weeks??
About 92kbtu in a gal, about 4.4lb in a gal, so about 4.5gal or so
about 41 hours.
| |
| barry@sme-online.com 2005-10-11, 11:21 am |
| Not such a great idea, if you're talking bringing a "20 lb" propane
bottle indoors.
Might want to work on sealing leaks.
J
| |
| I can't do that Dave 2005-10-11, 2:21 pm |
| Thanks to everyone who responded. Concencus seems to be about 40 hours
or in that vicinity.
I'll check with my insurance agent on the gas bottle inside. I can
always drill a hole through the wall and run a hose with bottle outside
on the patio.
As to the few comments on non-vented they are as safe as any other form
of heating. Modern ones have an ODS (Oxygen Depletion Sensor) that
shuts gas off before CO gets too high. Of course I would still have a
Nighthawk CO sensor which actually has a readout of the levels rather
than just a warning beeper if too high.
Thanks again guys, I will wive it a shot.
Dave
| |
| daestrom 2005-10-11, 6:21 pm |
|
"Tony Wesley" <tonywesley@gmail.com> wrote in message
news:1128984039.098262.226510@f14g2000cwb.googlegroups.com...
>
> Tony Wesley wrote:
>
>
> I just remembered, those new overflow devices limit the amount of
> propane you can put in the tank. So a 20-pound tank now hold about 16
> pounds of propane.
>
Funny, around here they still set the bottle on a scale and fill it till the
scale tips. For a typical BBQ bottle, the tare is something like 20 lb so
they weigh 40 lb when full.
daestrom
| |
| Tony Wesley 2005-10-12, 1:21 am |
| daestrom wrote:
> "Tony Wesley" <tonywesley@gmail.com> wrote in message
> news:1128984039.098262.226510@f14g2000cwb.googlegroups.com...
[color=darkred]
> Funny, around here they still set the bottle on a scale and fill it till the
> scale tips. For a typical BBQ bottle, the tare is something like 20 lb so
> they weigh 40 lb when full.
Got me. I've just read the 80% number a few times. I may have it
wrong.
http://www.htfd.com/sfeature.html
"An OPD is a safety device designed to prevent overfilling of a propane
cylinder. The float valve closes when the propane level reaches 80%
(the recognized safe level) to prevent overfill which can be a cause of
undesirable gas venting."
Perhaps 20 pounds is 80% of a full (to the brim) bottle??
| |
| Spanky 2005-10-12, 1:21 pm |
| I can't do that Dave wrote:
> Hi,
>
> I want to use a 10,000BTU wall mount, non vented propane gas heater
> this year.
>
> Can anyone tell me how long I could run it at full 10K output from a
> standard BBQ gas bottle? Hours, days or weeks??
>
> Thanks
My usage for Sept in the Seattle area, 2100sq ft, leaning to the drafty side
of a 30 year old mobile heated with a 30K BTU non-vented (do have a CO
alarm) used 31.4 gallons of propane.
9/1 4.4 start
9/7 4.5
9/14 4.5
9/18 4.5
9/21 4.5
9/25 4.5
9/29 4.5
With those numbers I switched to two 100lb tanks to reduce the refill time
to hopefully bi-monthly. Tad on the heavy side when full but manageable.
Keeps this old drafty place nice and comfy at 70 degrees. Electric forced
air was running me 300 plus a month for eight or so months of the year. Wood
stove works but refilling is constant and something about one room at 100
degrees while the back rooms are 60 just seems a bit odd. Not to mention
that between chains and fuel to cut the wood propane is cheaper, much more
even heat, and no unwanted guest brought in from the wood pile, should of
done it ages ago.
Plan is to replace the ventless with a vented unit once a full season
passes. 30K is not enough to hold the temp up when it does get cold, or so
the math indicates. But that sizing will be determined by the consumption
data and my personal comfort.
Non-vented units are fine, just get a monixide detector, even a residence
using vented gas unit should have such safety equiptment. It is law that I
have to supply one for my rental, but only a recommendation for my own home.
Go figure.
| |
| Solar Flare 2005-10-12, 3:21 pm |
| It always was. The new gadget only enforces that. The tank is a 25 lb tank.
"Tony Wesley" <tonywesley@gmail.com> wrote in message
news:1129087707.806663.60300@g44g2000cwa.googlegroups.com...
> Perhaps 20 pounds is 80% of a full (to the brim) bottle??
>
| |
| JoeSixPack 2005-10-12, 4:21 pm |
|
"daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com> wrote in message
news:h9V2f.40717$K91.20420@twister.nyroc.rr.com...
>
> "Tony Wesley" <tonywesley@gmail.com> wrote in message
> news:1128984039.098262.226510@f14g2000cwb.googlegroups.com...
>
> Funny, around here they still set the bottle on a scale and fill it till
> the scale tips. For a typical BBQ bottle, the tare is something like 20
> lb so they weigh 40 lb when full.
>
> daestrom
>
Ripoff! Ripoff!
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