Rinnai Tankless

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DoctorPepper

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Hey there, new to the forum here. I just ordered a Rinnai RU199en and it seems I’m going to need to run a new 1-inch line to it. The Rinnai has a 3/4 inch fitting for the gas line; would I just use a 1-inch reducing coupling at the point of entry? Or can I run the 1-inch line to the wall where it’s mounted then use 3/4 flex line from the wall to the gas inlet on the unit?

Thanks in advance!
 

Jeff H Young

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you could stub out wall 3/4 use a big enough flex for the btus. if your close within a few feet if its more than 5 foot I'd reduce at the shut off valve. sometimes I'll use a reducing 90 exposed at the wall that way anyone can tell in the future what size piping I had run. might be some technicalities
 
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Jeff H Young

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Thanks Jeff! So run the 1-inch line to the stub out, then 3/4 from the stub out to the tankless?
Sure Doctor , thats what I would do you wont starve it for gas the flex connector will be less than 1 inch or even if you are running solid gas piping with no flex its pretty standard practice around here
 

DoctorPepper

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Yes it'll be fine.
One other question for the thread. I’ve read mixed comments about flex pipe vs black pipe. I’m assuming the 20-foot run should be black pipe? I’m working in a crawl space, so flex pipe would be a little more forgiving, but if it creates other issues I’ll just tough it out with the iron. Thoughts?
 

John Gayewski

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You'd have to look it up. What's your pressure at the meter? If anything the CSST might need up sized, but CSST will work.
 

DoctorPepper

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You'd have to look it up. What's your pressure at the meter? If anything the CSST might need up sized, but CSST will work.
That’s a good question, I’ll have to get a read on it first. But I’ll probably just end up running black pipe. Once I’m through the wall it will only be two 90s. The rest is a straight shot. Thanks again!
 

Reach4

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If your gas company will provide 2 psi gas, you can use a regulator at each gas appliance to drop down to 7 inch water column (about 1/4 PSI). Some will. More won't do that, but if you can, a given size pipe can carry a lot more gas.
 
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