Nat. Gas Heater Addition with specs.

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Old 01-20-20, 06:48 PM
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Question Nat. Gas Heater Addition with specs.

First post, thanks all for any help available. I'm weighing my options on installing a NG heating unit.
Please see spec sheet attached.
Questions are:
- New proposed line would be 3/4, I'm planning.
- Will my current pipe diameters handle the addition.
- The chances of all appliances running at the same time is virtually zero.

Again, thanks for your time.
 
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Old 01-21-20, 05:51 AM
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First I would check your gas meter to make sure it can deliver the gas volume needed. Even if you don't think there is a chance all appliances will be on at the same time... you should still plan for it because Murphy's Law says it will happen on a really cold Sunday morning.
 
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Old 01-22-20, 10:53 AM
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My math shows the piping will handle it, most of it is right on the edge - but within the pipe sizing constraints.
 
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Old 01-22-20, 08:09 PM
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1" main at 65 ft supports 247k btu.

You can pipe to the heater with 1/2"

The chances of all appliances running at the same time is virtually zero.
Does not matter. code is code. But your borderline with any fudge factor.
 
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Old 01-23-20, 08:34 PM
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Thanks to you each. Few follow up thoughts:

I will eventually be adding an outside NG grill to this system at 48K btu, probably about 5yrs out.
- The stub is off of the 1", 9ft run directly beside the boiler.
- The proposed grill line would run 25ft.
- I imagine all 1" would need to be replaced with 1-1/4" to handle proposed heater & grill eventually?

I realize I could work on this with the charts, but instead of reinventing the wheel, I'd feel better listening to professionals who do this work everyday.

Again, thanks for your time.
 
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Old 01-23-20, 08:40 PM
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Well down here in the south the gas companys often increase the psi to a 2psi system.

That will increase the line to 1million BTUs say.
Then you need a regulator at each appliance... 40 bucks a pop..

 
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Old 01-23-20, 08:46 PM
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Actually youll get 2 million 100k btu from a 2psi system...

 
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Old 01-23-20, 08:54 PM
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Thanks, I'm in CT. I don't believe they do the psi pop. I asked my boiler installer 2 yrs ago when they installed about these "hypothetical additions" and he said 1-1/4" is likely, but he would have liked to run the numbers on the chart again. This is where my assumption came from.

Thanks again for your thoughts.
 
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Old 01-23-20, 09:05 PM
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1 1/4 get 486k. run up to boiler tee..

less then 2psi chart .5" pressure drop...

http://ecodes.biz/ecodes_support/fre...tallations.pdf
 

Last edited by lawrosa; 01-23-20 at 09:06 PM. Reason: put in correct link
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