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I recently installed a rheem tankless water heater using

Customer Question
flexible gas line. Customer is...
I recently installed a rheem tankless water heater using flexible gas line. Customer is having problems now. Rheem tech support said flexible gas cannot be used. Is that right? Even if a dirt leg is installed at unit?
.
Submitted: 2 years ago.Category: Plumbing
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Answered in 3 minutes by:
11/12/2015
Plumber: Mike R., Plumber replied 2 years ago
Mike R.
Mike R., Plumber
Category: Plumbing
Satisfied Customers: 2,886
Experience: 20 years of plumbing experience, including high end homes and service work.
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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Yes it is true since the inner diameter of flexible line is much smaller than black iron. Did you use 3/4 flex or 1/2?

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Customer reply replied 2 years ago
3/4" gas tite flexible gas line
Plumber: Mike R., Plumber replied 2 years ago

Well, even that is still too small. The minimum is 3/4 black iron. If you review the manual I do believe there is a chart that shows what gas pressures are needed for each type and size of gas pipe. If you put pipe dope inside the fittings then it may just be a blockage but still the pipe is below what is required.

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Customer reply replied 2 years ago
Rheem model#ECO150XLN3 eco sense mid efficiency . The manual says 3/4"
Plumber: Mike R., Plumber replied 2 years ago

No chart in the installation manual?

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Customer reply replied 2 years ago
Im under 30 ft. Came off of a 1" main line
Plumber: Mike R., Plumber replied 2 years ago

Did you count how many fixtures on on that line?

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Customer reply replied 2 years ago
2. Furnace and oven
Plumber: Mike R., Plumber replied 2 years ago

What was the gas pressure?

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Customer reply replied 2 years ago
That i do not know.
Plumber: Mike R., Plumber replied 2 years ago

There should be a chart in the installation manual that charts out what size gas piping is required for different pressures. Also you want to be sure that the meter is sized correctly. The gas company will do all that if you got a permit and inspection. If the meter is not sized correctly they will replace the meter for free.

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Plumber: Mike R., Plumber replied 1 year ago

I haven't heard from you. Was the information I provided helpful?

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Mike R.
Mike R.
Mike R., Plumber
Category: Plumbing
Satisfied Customers: 2,886
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Experience: 20 years of plumbing experience, including high end homes and service work.

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