Recent content by DoctorPepper

Just saw a video where the installer explains, "It’s a bypass for when the thermal bypass valve closes. The hot water needs to go somewhere so it’s directed into the cold side of the tankless." Still confused . . .

The mystery abounds . . . But thanks again, John, I really appreciate your input!

Thanks again! Your thoughts on the braided line? I have a mental block with that? I can't imagine how that line comes into play with all this? The cooled water from the hot line goes back into the cold supply through the check valve and hot water goes back into the hot lines like normal. So what...

Great, thank you! So just the 3/4" line and the check valve—those are the only components needed for the dedicated line?

So I got my external tankless installed and the water heater out of the attic. So far, so good—very pleased with its performance. However, when I bought the unit (RU199en w/ "Circ-Logic"), I also bought a recirculation pump—the GTK03. I couldn't get that to work; I installed it with a crossover...

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!

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?

The 1” run will be about 20 feet and will have 3 or 4 90s coming directly off the 1” line off the meter.

Thanks Jeff! So run the 1-inch line to the stub out, then 3/4 from the stub out to the tankless?

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...