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Old 03-10-2014, 04:13 PM   #1
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Tankless upgrade, bigger gas line?


See picture of line coming off my meter.

Tankless upgrade, bigger gas line?-forumrunner_20140310_160503.jpg

The line to the right is a 1 1/4" that is dedicated to the furnace (80,000 btu) about 8ft away.

The other line coming out of the T is a 1" outside diameter that is used for current hot water heater, dryer, and also had previously a cooktop and oven attached to that line ( now we have electric). Water heater us right next to meter but I would install tank less about 30ft away closer to where dryer is.

Is a 1" gas line enough for the dryer and 199,000 btu tank less heater? I was originally thinking one tankless should be able to replace the old water heater, cooktop and stove but 199,000 but sure seems like it might be too much.

Should I rework the gas line and give the furnace the 1" and send the 1 1/4 down the other side of the basement for they new heater and dryer?

Thanks for your help!

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Old 03-10-2014, 04:20 PM   #2
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Tankless upgrade, bigger gas line?


Maybe it would be easier to branch a 1/2 pipe somewhere and run that for the dryer and the 1" can be dedicated for the water heater...

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Old 03-10-2014, 05:51 PM   #3
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Tankless upgrade, bigger gas line?


Gas pipe is measured by ID, not OD. So your 1 inch is a 3/4. Your 1 1/4 is likely 1 inch.

You also need to know how many feet of pipe and how many fittings to properly size it.

Where are you located ? In some jurisdictions, homeowners are NOT allowed to do gas piping.
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Old 03-10-2014, 06:22 PM   #4
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Tankless upgrade, bigger gas line?


I see, Baltimore MD.
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Old 03-10-2014, 06:25 PM   #5
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Tankless upgrade, bigger gas line?


1" gas pipe(1" ID) is ok for your 199,000 input tankless, for up to 50 foot a way.

However. You need to check to see if your gas meter can handle the tankless, dryer, and furnace running together. You may only have a 240 CFH meter. When you need 340 CFH min.
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Old 03-13-2014, 09:50 AM   #6
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Tankless upgrade, bigger gas line?


So now I'm worried that the main line coming into house is an issue. Its only a 3/4" pipe from the county. And the meter says 275 cfh on the front.

So how does that work, looking at plumbing charts it seems I should have already been having issues. This 3/4 inch pipe goes a good 40ft to the street. This house had a hot water heater, dryer, cooktop, oven, gas fire place, and an 80,000btu furnace.

Is the 3/4 inch line from the county have a higher capacity before the meter?

Tankless upgrade, bigger gas line?-forumrunner_20140313_094606.jpg
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Old 03-13-2014, 09:58 AM   #7
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Tankless upgrade, bigger gas line?


Or is the pressure higher on the incoming side? Here is a pic of meter if that helps

Tankless upgrade, bigger gas line?-forumrunner_20140313_095814.jpg
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Old 03-13-2014, 10:39 AM   #8
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Tankless upgrade, bigger gas line?


I hate to sound like a "Debbie Downer" but did you also investigate any new venting requirements for the heater? (I wanted to go tank-less too - but didn't want to deal with the venting and gas line.
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Old 03-13-2014, 10:43 AM   #9
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Tankless upgrade, bigger gas line?


Yes, actually I was looking forward to the new venting (just have to put another hole threw the house with specific pipe for 2 way air travel) so I would free up the 2nd flu in my basement for maybe a future wood or pellet stove!
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Old 03-13-2014, 12:19 PM   #10
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Tankless upgrade, bigger gas line?


Consult a gas chart in the Natl Fuel & Gas code
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Old 03-13-2014, 12:23 PM   #11
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Tankless upgrade, bigger gas line?


Quote:
Originally Posted by tribe_fan View Post
I hate to sound like a "Debbie Downer" but did you also investigate any new venting requirements for the heater? (I wanted to go tank-less too - but didn't want to deal with the venting and gas line.

Hey tribe-fan...lets not get too excited about their spring season success.
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Old 03-13-2014, 12:31 PM   #12
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Tankless upgrade, bigger gas line?


I just spoke with our utility company and I have to fill out this giant form and sketch just to have someone let me know within 3 weeks if the line coming off the street will support what I need or upgrade the meter (which I know needs to be done).

Does anyone know if the 3/4" line coming in from the county support what I need? Is that at a higher pressure? Not sure if that chart counts for the before the meter math because if it does the 3/4" line only gives me 114k btu which I probably go over every day with heat, water, dryer running not including the old stove and oven...

Thanks for the help, if I end up needed to dig a trench in my yard I will probably scrap the whole tankless idea and just get a big ass gas tank heater.
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Old 03-13-2014, 01:34 PM   #13
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Tankless upgrade, bigger gas line?


At least around here the gas coming from the street is high pressure, and the meter changes it to low pressure, high volume. So you should have enough on the street side and just need a meter upgrade to give you the higher flow.
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Old 03-13-2014, 01:44 PM   #14
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Tankless upgrade, bigger gas line?


The street side of your pressure regulator is high pressure. Past that you're at low pressure.
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Old 03-13-2014, 01:48 PM   #15
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Tankless upgrade, bigger gas line?


cool, thanks guys!

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