Updated install: kzfaq.info/get/bejne/j9pmmZWlyMu2l6c.html Descale the unit: kzfaq.info/get/bejne/hLR6eKqJmaeloKM.html

I have the next Rheem model up. 3 - 40amp breakers to match my tankless oil boiler output. When the spring comes I shut down the boiler and maintenance it and turn on my electric water heater. Very impressed. The truth, I’ve noticed the bill go up about 20 bucks but I don’t use the tankless during the winter.

Ok for future reference to anyone who sees your video. They must know that the unit requires 2 40 amp dual pole breakers because each chamber requires 40 amp at 240v. In order to obtain this you need to connect both black & white wire to your dual pole breaker. Then respectively connect them to the system.

Thank you for creating the video. Completed the installation of my Rheem 11series for my bathroom shower in my office. Your video clarified a few questions I had.

Tankless heaters will last longer if you put cleanout transfer valves for flushing the heater with a vinegar/water mixture to descale the unit. I do this yearly.

I'm glad I found this video. You answered a few questions I've had. First, it looks like you're using pex and that's what I want to do. I know I need to check my current regular water heater power requirements, but I'm hoping I can use the same circuit. I'm pretty confident that I won't need to use much pipe because of the existing pipes. But I need to study it. With only 2 of us in the house I think one of these will take care of our needs.

Have one, Tempra 27, hooked on my well ( living rural community), works great. Love it. My plumber did not recommend it for a whole house system rural, said it would not work . He was WRONG (Iblame it on working old school). Just a comment on your install: it looks great but around here, a pressure safety switch is mandatory on the hot side. Good work. I will be installing the exact same system as yours at a friend's house in a few weeks. Keep posting.

Jeff, Thanks for the review. As a retired master electrician I would urge you to wrap the white wires in red electrical tape. This will signal to anyone who follows you that these are in fact HOT wires when electrified. White represents Neutral wires. Your present wiring without red colors will confuse all but professionals who know how to spot non-professional installs. Safety first, please.

The tankless water heater seems very nice. Good video, thank you. 💕

Great coverage of this Jeff and I've learned alot from your video and the many good comments posted. My old gas heater is just that, 'old', so this gives me some very good ideas and information when the day .... oops, don't want to say it out loud!! Thanks Jeff.

Great info! A couple tips on the electrical. You have to re- identify the white conductors with red or black tape at both the heater and in the panel. Also the ground ( bare) wire is not connected to the neutral. It’s landed on the equipment ground in the panel.

Several years ago I thought about putting a natural gas instant water heater. After researching it further I decided to stay with the old 40 gallon natural gas heater. This what changed my mind. 1. I would have to have a larger gas line from the meter to the house. I would have to upgrade my natural gas meter. Just upgrading the meter would cost $ 625. The cost to upgrade the natural gas line from the meter to the house and to the instant water heat would be several thousands more. 2. I would have to install a water softener. That would cost anywhere from $ 2,000-$3500. Water softeners have to be maintained with chemicals in order to work. Our water in Houston is pretty hard. Scale, lime and other deposits would plug it up over the years.

I like ur clarity and snap installation video...

Bought this exact model for a single wide I reacently bought. I am going to be redoing the entire water system, which is currently galvanized steel and copper, with bits and pieces of other materials here and there. Doing everything in PEX-A due to the material's ability to expand, for piece of mind with frozen lines having a lower chance of bursting.

I’m installing the Rheem 13KW heater. I’ve got low flow showers and I’m willing to restrict folks to one shower at a time. I’m still in the dark about my water connections. There are male 5/8” compression fittings into and out of the heater. They included two 5/8” sleeves and two options: I can use a sleeve and female compression fitting with 5/8” copper but that’s out. I have well water that’s slightly acid and I’m replacing all the copper pipes now. I’m going to use an acid neutralizer but no copper - all plastic. The other water connectors are a male compression to 1/2” male NPT. I can buy flex hoses with 1/2 NPT so I prefer that option. I called Rheem to ask if I could use just the sleeve or do I need to put short pieces of 5/8” copper tube inside the sleeves? They just said to “Ask my plumber.” I’ll just have one 60 Amp breaker with #6 wire. Rheem shows how to wire the breaker but doesn’t even mention opening the unit. There are two sets of small screws. One set didn’t seem to allow anything to open. The other set let me remove the entire front of the unit. Pity they didn’t bother to tell us which to try. It looks nice inside though. Neat! Ok. Back to it.😊

Thanks, just starting my research. My tank heater is nearing 25 years old, so before it fails need to sort this choice out.

Good info. Thanks! Quick tip: don't use Teflon with those fittings. It doesn't provide any backup protection and only prevents you from getting the connection tight enough to prevent leaks like you had.

Years ago I had an Aqua Star the oil company installed it ( it was propane) I'm sure they have greatly improved since ( 20+ yrs ago ) the concept is a great one .

Getting propane is tricky. I have 2 Rinnais, one for hot water the other as a boiler for the radiant floor. They are wonderful as long as they have propane, DA! I want a backup tankless electric water heater just in case. Great video. Thanks. In the country off Virginia's Chesapeake Bay.

Fellow 716'er here. Thanks for the awesome vid!

I would appreciate if you went into more detail into the electrical connection. I can't believe these contractors want $4000 dollars to install this water heater. Thank You, I love your video, it's going to save me some money

Thanks for sharing!😊

Thanks for the info!

Tank you. Very helpful.

I don't have one with love to get one installed in my house I heard they was great

I had this exact unit installled in my familys cabin 5 months ago, it worked great up until about 3 weeks ago. Granted we are on a well, and have hard water, but we literally take this thing apart at least twice a day, clean out the inlet impeller, clean the inlet screen, put it all back together again, it works for a few hours and then stops. It doesnt show any codes, just a trickle of hot water, thats it. Not only that but our cold water only trickles too. I understand that unless there is a huge scale buildup this unit shouldn't affect my cold water, but its happening. We have no leaks, we upgrated everything from copper to Pex, had a 200amp breaker installed, I've dug up my main water line that goes into the house, no leaks, ive had a plumber come out and check it out, nothing. My girlfriend soaked all our airratiors in vinegar overnight, no change. Ive spoken with Rheem tech support 6 times and all they can do is loosely troubleshoot it for you and send you a manual on how to fix it, my unit was 2 DAYS out of date so nothing was covered, can't return it. The only positive thing is that i live on a lake and can take baths in it. Any input would be an enormous help. Thanks

Shark Bite. Honestly, even though Shark Bite is expensive compared to regular fittings, it's well worth it. I have had issues with getting other fittings just right, but I have never had an issue with Shark Bite hoses, valves, or fittings getting in place or leaking

I had this unit installed on the outside my house and it has lasted for about 20 months. It has stopped heating constantly since the last descaling. I have been given a lot of advice about what I should do and it is all expensive. Considering the price of everything, I think I am going to just change it for the same one. With this video, I think I can do it myself. So, wish me luck and thank you.

great video, go Bills

Thank u

Thought about going electric tankless (no gas service here) but decided to go with a rheem hybrid water heater instead just over a year ago (heat pump + electric tank water heater). Far easier run on a home solar+battery system or a generator than electric tankless and has almost the same operating cost as gas tankless water heater. (Massive down side is that it cost more upfront and you'd need a condensate line running to a drain or outdoor just like with an ac.)

Im from Appomattox Virgina which is near central Virgina too!

716 Proud !!!!

I would love to have seen a solid test of this unit with a shower and a sink going at the same time.

Gracias por tu video. Saludos desde Fresno CA. 👍😎👍

I except that you used electric to heat the water. I understand that gas heats better and faster. I used to have an electric system in each room above each sink or showers. I loved it.

Nice looking install except for one thing. You need an electrical connector where your wires enter the water heater to protect wires from damage. I am a licensed electrical contractor

You mentioned another brand with plastic inlet and outlet are you referring to the A.O. Smith model? I’m probably one of the few that have both the Rheem 18 kW and A.O. Smith 18 kW. I’m currently using the AOS which according to them lasts longer due to the way the heating elements draw electricity. I like the Rheem because you can turn it on and off and like you said the display will change when it’s in use.

I want to get one. Im tired of all the hot water being gone by the time its my turn in the shower. I also have solar so I guess I have to see if my panel needs upgraded.

i did installation i built a cabinet and i put it inside i dont know if i did it okay every time i used dound likea power going down

What to do if it just gets warm? Was hot and working bit now its just warm with temp all the way up

Hi. I have a 30 foot run to one of my bathrooms from where I plan my install. should I insulate the hot water water line?

Jeff thanks for yr video am not sure if a water softener was used to protect the unit from sediment caused by chlorine that's the mistake a lot of plumbers make in installation of these units

Are flexible pipe connections required, or can copper water pipes be soldered to the wall mounted tankless? Thanks, great video, very helpful.

That is a slick unit, what gauge wire did you use?

hello,how far would be to to install this from circuit breaker panel?planning on installing close to breaker so i can just run romex outside the wall

Awesome video! I'm about to install one of these myself. Just out of curiosity, how much extra do people pay in electricity per month with this system?

Mine was hooked up but when I turn it on the temp number comes on the display light shuts off immediately after

You should use wire nuts to go through the opening in the box.

I really need a water heater at the moment we have been boiling water for quick showers but can't afford the big boilers ATM I just wish I didn't have to do the electrical part I'm not experienced to do that 😢 kinda making me question it and my abilities to accomplish this.

I was disappointed to see how you ran the electric. You would never simply jam the plastic conduit into a sharp metal hole. At the very least, you would put a 1/2" or 3/4" romex connector there. I was only looking for a how to video to see if the installer was using liquid tight flexible wiring/ conduit, connectors. I only mention this because people shouldn't think its ok to simply put the conductor through the unprotected metal hole.

You definitely need conduit connections coming out with electrical wires

HI sir ,my retrex36 reehem tankless water heater ,so i think my heater temperature controll regulator is not work how to change it. pls.

Would it help if u insulate the pipes so hot water stays hot ?

For two or one person its great more than that it sucks!

I understand that installation is very expense - assuming a $1,400 tankless heater unit, the total cost with other parts and labor is approximately $4,000 total - but could be higher. This compares with an equivalent 80 gallon hot water heater about $1,500 total cost.

I have this what wire do I use? Also do I need a ground wire for this box?

My water heat is a Fagotti and it is inconsistent, sometimes it works something it doesn’t, and it’s been not working I’ve been showering for a week with cold water … gas is going in, water is going in but it doesn’t get the signal to turn on despite of having every faucet open to hot

How do you descale it?

Where can I find the reset button? Thanks

Can I use this in a hair salon that has 3 sinks 4 hairstylists and washing machine ????

Do you wish you would have installed an isolation valve for easier clean-out / flush of the water heater to get rid of build-up?

So u need 4 hot wires. Plus the neutral and ground. Wires todo 6 wires ....????

Hello Jeff, I have a question. If I'm installing a 27kw rheem tankless water heater will I need three 8/2 wires and three 40amp breakers to get it hooked up correctly?

Pls the 6 terminal is it 3phase ?

Does this unit come with the electrical wiring or is that bought separately? Also, if it isn’t included where can I buy them?

I cannot have electric tankless water heater because I live rural always electricity outages. Propane tankless is wised.

Have you noticed a difference in your energy Bill.

Great video, I recommend a pre filter in the line before the waterheater.

As a DIY, one should mention that the unit requires 8AWG electrical wire. It would have been interesting to see what conduits were used to run the electrical wires from the outside service panel to the inside unit.

I have this unit and I'm getting an E5 code. The code won't go off until we choke the water down to a trickle. Any thoughts?

One question how long does it last before you have to get it serviced

I had that exact same water installed yesterday and we couldn't get water for flow after 20 min

What maintenance can I do on this. I have this exact one it has been running flawlessly for over 2 years, I have a salt brim tank water softener. Do those brass pipes need to be cleaned at all for build up?

I hook one up and it blew the board in 30 seconds . Had hot water briefly . Made in China is that bad ?

Great video, when it starts up, does the amperage draw cause the lights to flicker? Is that an issue with electric tankless?

@8:49 you mention the E5 code. I think the E5 is actually an error that is letting you know that the water temperature that you have set is not being reached. Typically, due to excessive flow rate. Meaning, due to high water pressure (high flow rate) the water is not staying in the element long enough to reach the desired temperature. So the fix would be to install the proper flow regulator and/or lowering the desired temp.

You need two 40A circuits? Or just one 40A circuit breaker? Wish you showed the other end of your wires to the circuit panel.

Mine was installed by an electrical and didn’t even turn on. Any ideas why?

It doesn’t seem to be wired correctly per diagram… diagram shows two double breakers with each wire set on different breakers…. Is this necessary since there are two elements?

So at the double pole breakers, one gets 2 black wires and the other gets 2 white?

Thank you for taking the time to share this content can you please tell me what the operational cost is thus far on this unit looking to get the same unit any information you can share will be appreciative. God bless

I didn't see any valves for servicing the pipes. I think they run white vinegar through them.

No Romex connectors will short out when wire gets dug into from sharp metal

We have a leak and can't get the cover off

Im getting e5 code and water is not coming out hot enough. What are your thoughts

Is it suppose to have the message E5?

On your tankless water heater did you have to install a drain pipe

I live in Louisiana and mine does not stay hot. It gives me a lot of problems. At times it does not come on. Help ?

Hi. How can we clean the filter?

I presume we use an 8/2 solid wire for this installation?

What size wire did you use?

Hello importan question how you flush the system ? 😢

Your tank had E5 shown on the display. Is that an error code?

The only problem is if the power goes out, you have no hot water, you still have hot water with a natural gas tank heater

the only problem I see is that if a power outage happenes,then no hot water

Everyone must know do not install these units unless you have 200 amp minimum panel. And use conduit to the unit for your wiring when exposed , not in the walls or under or attic but when the wire daylights to the tank.

how many square feet is your house

YOU did not show how you did it, only what you did,,,, I needed more visual ,,,especially the electrical

Oh yikes, those electrical feeders aren’t in conduit?! I’d at least put them in flex, should be in like 1 1/4 to 2” EMT