I want to use a 10,000BTU propane, non-vented, wall mount radiant
heater. Having an all eletric home means no gas tank outside.
Can anyone tell me how long I might be able to run one of these at full
10,000BTU from a standard BBQ propane tank.
Are we talking hours days or weeks??
I did a few searches but your "heat content" was the key, I got so many
hits it was useless with the searches I did. DUH!! Slapping myself on
I will see if the tank is marked with "gallons."
Given the gallons though, what do I do with them and 90K/gal? I think
the tanks are around 5 gallons. I'll go look.
I need to look up exactly what BTU is, (other than British Thermal
Units ;-O), but is that rating for the heater per hour or minute or
Thanks so far though.
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.
Some states still have code from 30 years ago and still deem unvented to be
unsafe. Safe or not, you must stay within the code. Some states allow only
small unvented heaters in a sleeping area but ok for larger unvented in
non-sleeping areas. Aside from CO, unvented burns any particles or fumes in
the room and vents that to the room so California has declared them to be a
cancer causing agent. From experience, don't light them for a few days after
using oil based paint or contact cement. Long after the danger of explosive
fumes has gone, the byproducts of combustion can still be nasty. Liquid
Nails will emit fumes for two weeks that when burned cause an irritating
A BTU, British thermal Unit, is the ammount of heat necessary to raise one
pound of tea (well, really water) one degree farenheit.
As opposed to a calorie which is the heat needed to raise a gram of water
one degee centigrade.
A 20# cylinder contains about 4.8 gallons of propane. This will give
you a total capacity of 441,600 BTU. You can get 30 to 33 hours of
operation IF the outside temperature is above +10F. If the temperature
drops below +10F you're out of luck.
As the propane boils in the cylinder it gets cooler. If the outside
temperature is warm enough enough heat will flow into the cylinder to
enable the boiling (vaporization of propane) to continue. For a 20#
cylinder, 25% full, 10,000 BTU/hr is the maximum rate at which you can
extract propane for heating. If the fuel is butane the time is quite a
I do not follow the above reasoning...about what the outside tempature
....the freezing temp of Propane is like minus 400 or so degrees....not
really sure but real real low...and the boiling point is about Minus
Again I just do not understand ...it boils yes...and the resulting
vapor is what you burn...
If the outside
Sorry but this old guy is not a rocket scientest by any means...but I
can tell you that you can store a 20 pound cylinder of propane in your
house hold freezer and the propane will still be well above its
That said... I heat my shop with Propane....(116,000 BTU gas furnace
converted to burn propane)... I burn about 300 gallons...of propane a
Yes, absolutely. I think the issue is one of rates--if you are trying
to draw propane out too quickly, the environment around the tank may
not be able to supply enough heat quickly enough to keep up with the
heat requirement to boil the liquid propane.
On 10 Oct 2005 15:26:11 -0700, email@example.com wrote:
If I remember correctly, 1 lb of liquid propane has somewhere in the
neighborhood of 20,000 BTU of energy stored.
A stock propane tank for a grill is usually 20-30 lb of propane so
you'd get a total of somewhere in the neighborhood of 400k to 600k BTU
So if your heater generates roughly 10,000 BTU per hour you should be
able to get around 40-60 hrs of use on a standard "gas grill" type
This is all, of course, the roughest of calculations and your mileage
may (and probably will) vary greatly.
"I've been here, I've been there..."
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