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G.B Stein said"silent gratitude isn't much use to anyone" - with that I say Thank you sir, saved me a costly service call.

This technique solved my condensate drain problem. Thanks for this video. 👍🏽

I hope this works. I have a unit that bangs initially when the hot water faucet is fully opened or if the clothes washer is started. It doesn’t bang when the hot water is slowly turned on. Did I flush with no improvement. Hopefully this does the trick

Dude. This is RAW PLUMBING POWER. Yo i got sent on a random call and no I don't do water heaters like that. But I'm a capable qualified technician. Thanks for the run through my dude. I am on my way to it now. If anything I think I'm not the first company to diag this heater. I think you just saved some dude from buying a new heater unnecessarily. Score one for the good guys (I hope)

I have an RUR199iN that threw code 12 today. The unit is 2 years old (installed August 2022). When you remove the flame rods and ignitor, do you have to take it apart from the gasket? It looks like I could just carefully clean the flame rods and ignitor rods. I'd hate to damage the gasket. Other oddities with today's problem is that when the tankless water heater tries to fire up it causes the stove in the kitchen to lose flame. My wife was cooking while I was troubleshooting the unit. I turned on the tankless (plugged it in and turned it on). The tankless was "cycling" and sounded like it was always trying to "fire up". My wife came out and said they stove burner lost flame and would not re-light. I turned off and unplugged the tankless. And lo and behold, the stove started working again. Is the tankless just sucking too much gas when that happens?

Great video. Thank you

Do you also need to put a condensate collector on the air intake? I'm installing a Rheem condensing tankless heater and there's a picture that shows the regular condensate drain AND the condensate collector on the air intake

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Mike, I have 2 Rinnai R75Si units that are 16 years old. One of them has no error codes but will only run hot water to the shower for about 4 minutes then turns cold. Then will turn back hot for a little while then repeats the cold, hot situation. I had a level 3 tech come out and suggested a new heater. I just don't understand why it can't be fixed. Could you give me an idea of what might be the problem. I have reduced the Temp down to 102 so my wife can keep it on full hot, thinking it might be not enough flow to keep it running hot. But that hasn't fixed it either.

Igot a noritz and their info is useless. Love your knowledge. Say you use your exact set up in basement and everything. Your cool condensate pipe with u in it to prevent vapormlock is awesome. You dont leave pipe likenthat thoughnright? Condensate doesnt just drip onto floor lol. How do you get it from there out of house? A pipe across floor isntrip hazard right? Ingotta get this shit out of house outside. Thanks my man. Again, Noritz is still useless.mThey dont know

Is this what could cause a code 55 since it's dealing with the water flow?

Do you have anything on code 55 on the Rinnai and how I can resolve and clear the code.

Mike if I’m going through my existing b vent can I use the Diversitech concentric vent pipe on this unit?

I have a cu 199 en how can i add recalculating feature ? no reciurc line thank you JR

Hey Mike, great video. I appreciate the detailed explanation with why you do it this way. Is this also necessary on their combi boiler units? I've noticed they never have that bit of detail in their installation manuals. Also, have you ever run into issues with how brittle CPVC is? I've seen several plumbers say they won't install CPVC unless the customer signs a waiver. The waiver basically saying anything CPVC is not warrantied and callbacks/repairs on CPVC are full price because it's brittle and tends to fall apart. I've seen most recommend Sch 40 PVC or if the customer is really paranoid, sizing up and using Sch 80 PVC. Any thoughts on that?

So just to confirm this will not work with a S model, exterior recirculation pump, and Navien pump wire, and NaviCirc Valve...? You have to have a A model??

Tool works perfectly. Tried using pliers and immediately cracked the filter fin. Only negative is that it’s pricey at $30 for what is basically a socket. However, I considered it a contribution to Mike cause his video on replacing the Venturi part saved me $700. Support Mike!

Really wish the HEpump kit came with the 1/2”x3/8” comp adaptors for under a kitchen sink. Built in braided lines with all these kitchen faucets

Sir, you are a gem. My plumber wants $700 to replace the Venturi part. Thanks to your video, I can do it myself. However, Rinnai won’t send the part out directly to consumers so I will have to ask the plumber to hand it over. My question is: when the Venturi fails and throws a code 15, and I shut off the unit, should that affect the flow of water to my hot taps? I thought water was still supposed to flow through the unit (just not heated) even with the unit off/malfunctioning. This low-flow happened after I came home after 3 weeks away.

I'm experiencing a 63 error code with swing valve installed on the recirculation line. Do you think these are related?

Hi Mike, I love your videos! Can you help me out here, I have a Navien hotwater heater modelNPE-240S - Had a error code of E.110. Fixed the problem, clean the filters and flushed the system clean. How whenever calling for water. The hot water makes a strange gurgling sound? How can I fix this? Any advise. Thanks

I wish this covered the RE series. I'm installing an RE140iN.

I watch your festool videos! I didn't know you have this plumbing content. I'm so grateful. Thanks for the videos as I'm trying to DIY this

There are thousands of regulators placed 12” from exterior rinnai water heaters in my area that have been operating fine for over a decade

Can you use this for automotive applications ?

Such a great garage workshop, nice!

Awesome! Thanks, Mike!

Did the guy in red shirt die from covid or meth?

Time for a new unit

Thanks Mr Tankless Guy. My 6 year old Rinnai tankless installed with brass female transition fitting to 1/2 inch pex line corroded and fell off. With guidance of your video I installed new line including vent myself saving a lot of money. Great to have access to experienced pros on you tube.

I need to see someone take the old unit off and install a new unit altogether. Do you have a video like that? you probably don't advocate DIY on this, but plumbers want way too much when all the water, gas, and exhaust lines are already in place. I don't want to mess with propane but I may have no choice... my old unit is flooding my cellar.

Thank you. Your instruction saved my family from cold showers! I was able to get the diaphragm operating again!

If I have a gas hvac currently sharing the B vent for the water heater, can I put them both on this concentric pipe?

Thank you for your tutorials and sharing your knowledge. I appreciate your efforts. I

Thank you for sharing this! Error 10 is driving me crazy and this gives me the confidence to go cleaning deeper than the fan. 😅🙏

Thanks for the video. I came here after my plumber blamed my NPE--240A2 putting out hot water from the cold tap on the Navien system. By the way, you nailed it! 3 is tertiary. The full count from 1 to 10 is primary, secondary, tertiary, quaternary, quinary, senary, septenary, octonary, nonary, and denary.

Good information!

Your amazing very detailed info thank you so much

Thank you -- had a code 10 on an RL75 interior unit and had the problem of hot water running cold after a few minutes. Cleaned out blower that was full of dead stuff. Saw a bit of debris in the exhaust line as well and cleared it. I couldn't figure out how to disconnect the blower, but was able to clean it out without disconnecting (with power off). So far, hot showers. A local plumber wanted $850 to clean the unit with no guarantee it would solve the problem or $4200 for a new unit. I had descaled a few times and cleaned out the water filter, but the blower cleanup seems like it's solved the problem. THANK YOU!

I have a problem with a rinni tankless water heater. Talked to tech support 5 times . They say it's the heat exchanger scaled up.and needs a new one. Been flushed every year. Working fine when I arrived flushed this time doesn't work after. I would like your opinion how can get ahold of you to tell you more details

That is a very thorough video. Thank you for it.

Hey tankless guy congratulations on your growth and certainly wish you the best in the future! Question for you... I am a homeowner I have Rinnai RU180in ... It's just over 3 yrs old. I have performed a flush on the unit so I think I'm good there. However, I'm getting hot water for about 15-20 minutes and then it goes cold for 3 minuites or so, and then returns back to hot. I have seen several videos on CZcams where guys are taking out the blower and clean it out and put it back in. My unit doesn't a blower that you can easily access like the ones I've seen on CZcams. Any recommendations? Thank you!

What I’ve been trying find out is does Rinnai make an attachment to cover the intake, the outdoor aspect, screen to cut down on the amount of larger insects from entering the unit? It can be a problem especially during years of a lot of moths or wasps, I think I can design one that won’t interfere with the exhaust. My intake/exhaust pipe is longer than the one shown since it’s about 13 years old. I’ve been looking for such an attachment pretty much everywhere.

Awesome video!!! why can't we use a gfci receptacle?

Hello I have a brand new rinnai tankless water I installed. The units blower keeps turning Off and on. It's a solid light, so it indicates water flow and flame present. Except I have no water running and no leaks. What do you think could be the issue? Any help is appreciated.

Are all the burner gaskets the same?

Yes there are so many negatives to a tankless unit now that we have heat pump units we need to rethink the need yes endless hot water but a fried circuit board and longer delay for hot water without a circ pump not the problem solver it was thought to be and burnin that fossil fuel

Good tips! My tankless has been running off solar power for the last 7 years. It's plugged into my solar power inverter and that powers the heater day and night.

can you use CSST? or only black iron?

Great info, helped troubleshoot our 7 year old Navien.