o/t what propane reugulator?

going to use a 100# tank to run my furnace,just as a back up ,I burn wood most of the time,do i use a low pressure or high pressure regulator,thanks

Depends on how far your tank is from the furnace and the size of the line to the furnace. Propane guys can give lots better advice.

its 65 feet from furnace and 3/8" line

Low pressure for homes. High pressure for fish cookers,etc.

Let your propane dealer help, they know their business.

100 lb tank will not run a furnace too awfully long.

1 pound of propane gives off 22,000 BTU.
do the math for your furnace BTU size.

If you have 65 feet of 3/8 line then you must have a high pressure regulator at your big tank, and a low pressure one at the furnace. But if you are unsure of what you have you should consult your gas supplier as others have said.

I agree high pressure at tank 10 psi, (red) low pressure where you go into house, 11 water column inches, (green, brown not red). There is about 20 gallon of gas in a 100 lb bottle. Will run your house for about 2 days, if it doesn't freeze off. Probably work better if you put tank in the house right by the furnace, with just a low pressure regulator. But no the safest thing to do. I would do it if the other choice was freezing to death! Vic

I just took the line off of the 500 gallon tank and hooked it right to the 100 pounder and then later to one from a tractor that had a crack in the tank and needed to use the propane or loose it. Both were empty when done. chris

I have been heating with 100# for 10 years now, the coldest winter I change one every 7 days, cook and dry clothes with LP too.

(quoted from post at 09:11:33 10/24/13) I have been heating with 100# for 10 years now, the coldest winter I change one every 7 days, cook and dry clothes with LP too.

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Yep about every week or so depending on area heated/ furnace BTU ,etc.
I just prefer the 300 gal tanks, easier on my old back and forgetful mind

The ONLY time a "high pressure" regulator is used is at the tank, when LOTS of BTU's/gas flow through the underground line from the tank to the building is needed and they MUST be paired with a secondary/low pressure regulator at the building.

Probably NOT gonna happen from a 100lb tank!

I don't know of a single example of a propane appliance that is not rated for 10" to 13" W.C. of pressure.

A single-stage regulator at the tank, or a two-stage/primary/secondary regulator system with a high pressure regulator at the tank and a secondary regulator at the building delivers this standard pressure to the appliance.

Which reminds me of a true story...

A man jumps out of an airplane with a parachute on his back.

As he's falling, he realizes his chute is broken.

He doesn't know anything about parachutes, but as the earth rapidly approaches, he realizes his options are limited; he takes off the parachute and tries to fix it himself on the way down.

The wind is ripping past his face, he's dropping like a rock, and at 5000 feet, another man goes shooting up past him.

In desperation, the man with the chute looks up and yells, "Hey do you know anything about parachutes?!"

The guy flying up looks down and yells, "No, do you know anything about gas stoves?!"

Enuf said... don't mess with this stuff if you don't understand it!

If there is anything that we see on these forums more often than someone trying to jack with something he doesn't know anything about, I don't know what it is.

"Probably work better if you put tank in the house right by the furnace, . . ."

NEVER, NEVER, NEVER, put a propane tank next to a furnace, the radiant & convective heat from the furnace will cause the propane tank to build up excessive pressure to the point where it either vents through the safety relief valve or it ruptures the over-pressure burst disc. Either way you are venting propane gas into the house right next to an open flame source . . . and KABOOM! you've just blown your house off the map, and in all probability with you and your family inside.

Not a pleasant thought.

Doc - Retired Firefighter/Paramedic & Coroner
with 50 years in the Fire Service both as a paid Professional & as a Volunteer.

Some other thoughts, from personal experience in my basement years ago; the stuff IS heavier than air, and it WILL collect in a thick layer on the floor, just waiting for ignition. And you cannot tell, becuase it deadens the sense of smell. You may notice the smell to start off with, but as you mess with it indoors, your smell of it goes away. You WILL NOT smell it, you cannot see it, you cannot tell it"s still there.
And so when you stike a match like I did, try to light the appliance, and that big roll of blue flame rolls across the floor, in the 18" thick layer of propane, you"ll say "Never again!!!"
Trust me, dangerous stuff.

Mine was installed by the propane company. 10 PSI regulator at the tank, another regulator on the wall of the house (1/2 PSI?). Interior piping by the HVAC contractor.
This week, a couple of really smart brothers near here were stealing copper in a church basement. Using a lighter for illumination. When the other cut the gas line, burns occurred. They were arrested at the hospital.

When dealing with Propane or Natural Gas, when in doubt, ask a professional. Neither one is worth dying over. I switched from the 200 gallon Propane pig at my cabin, to a 100 lb cylinder. I removed both regulators that the pig used, one at the tank, one at the house wall. Ran all new copper tubing and purchased a new regulator from the hardware store, outlet pressure was set for the Stove and Hot water heater, and the regulator was made to handle supply for more BTU's than my stove and Hot water Heater totaled. Everything works fine. I also consulted with my friend who is in the HVAC business and he confirmed the regulator i was buying was proper for the use. A 100 lb Tank will run a furnace, properly setup, but like others have said, not likely for a long period.

JMOR I asked the question because I didnt know; I wasn't jacking with any thing,so I guess you are a know it all? you've never asked a question or worked on anything you didnt know anything about!

(quoted from post at 23:58:58 10/23/13) NEVER, NEVER, NEVER, put a propane tank next to a furnace, the radiant & convective heat from the furnace will cause the propane tank to build up excessive pressure to the point where it either vents through the safety relief valve or it ruptures the over-pressure burst disc. Either way you are venting propane gas into the house right next to an open flame source . . . and KABOOM! you've just blown your house off the map, and in all probability with you and your family inside.

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Furnaces dont get hot, not even warm to speak of. They have good sized fans in them that circulate the heat created throughout the house. Im not saying its a good idea to put a 100 pounder in the basement by a furnace (because it isnt), Im just saying the reason its not a good idea has nothing to do with furnaces getting hot because quite simply, they dont.

But dont take my word for it, check it out yourself. Start the furnace and run your hands all over it feeling for "hot spots". Point your infrared thermometer over it looking for temp spikes. You wont find any with the exception of any older furnace exhaust vents and while those are hot, maybe even hotter than you would like to keep your hand on, they dont add enough heat to a room to pop a 100 pounder. Not even close.

Amazing. It is one thing to work on an old tractor and a totally different one to mess with Propane to heat your house based upon widely varying and obviously suspect advice from the internet. Can't imagine how I could justify putting my families life in jeoprody just to save a buck or two.

Think about what you are asking.