Propane Gas Line

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Ryder

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That will handle 201kbtu. Depending on outside air temperature though you may run into problems with there not being enough area in the propane tanks to properly vaporize propane fast enough.

Well, I expect that the tankless system will *rarely* try to pull 140K. It has a 6.6 gpm capacity, and I don't think that more than a third of that will ever be used... I can see it kick up to 14oK draw initially... then throttle back.

How did you calculate/get 201K for that, may I ask?
 
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DonL

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Well, I expect that the tankless system will *rarely* try to pull 140K. It has a 6.6 gph capacity, and I don't think that more than a third of that will ever be used... I can see it kick up to 14oK draw initially... then throttle back.

How did you calculate/get 201K for that, may I ask?


Where did you get the "6.6 gph capacity" figure from ?
 

Ryder

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I cheated and used my ward flex app. Lol


Hi Tom...

Yes, the 20' length of black is 201K... but you didn't add the 4' of 1/2" OD copper.

That's the issue. 1/2" OD copper is far more restrictive than 1/2" black pipe. It has to be accounted for.

R
 

DonL

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It may work fine if the tanks do not run low, and the tanks can keep up.
 
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Ryder

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Thanks, DonL.

It ran fine today with only one 20 lb tank. Crisp blue flame... of course that was with a full cylinder on 80 degree day. Hopefully two 40 lb tanks will help guarantee performance in far more questionable circumstances.

I am seeing about a 3" drop though, when it's throttled full... this suggests that the delivery is perhaps barely adequate.

The regulator is supposed to be delivering 11" w.c., but when static, the manometer is reading about 14". When the heater starts throttling... it then drops down to about 10.5"-11"

Do some reg's let things sit high when there is no demand? Or is perhaps the manometer is just out of calibration, reading high a few inches? I suppose it could be set a little high from the factory.
 

Reach4

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Or is perhaps the manometer is just out of calibration, reading high a few inches? I suppose it could be set a little high from the factory.
It should be easy to check the calibration. Hook up some dry clear tubing and shove the bottom into water. When the level of the water in the tube differs from the level of the water surface by 14 inches, your manometer should say 14 inches. Opaque tubing would be almost as good, because that small pressure will only compress the air in the tube roughly 4%.
 

DonL

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Yes. It's rated to deliver about 60% more than required.

I don't think that regulator is made for a 20 lb tank. What size tank is it made for ?

Most tanks that small can not keep up for vary long, with less than 5 gallons of fuel to start with.

If you are lucky you may get 1 hour on a hot day. Forget safe winter operation on a small tank.

I wish we could get something for nothing, I never have.


Have fun.
 
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