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Old 07-21-2012, 01:29 PM   #16
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Wiring for an electric tankless water heater


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Originally Posted by Speedy Petey
I'll just add, we see A LOT of folks coming here for advice after the fact. Then they get upset when the answers are not what they wanted to hear. Most folks like this jump full on into projects they are completely unprepared for. This is NOT a good recipe for electrical work.
Most of us here are here to try and prevent folks from getting hurt or hurting others. This may ruffle a few feathers from time to time, and I am OK with that. You know what they say about making an omelet......
Personally i would rather see someone leave angry than hospitalized or worse.

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Old 07-21-2012, 01:31 PM   #17
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As evidenced by the fact that I get yelled at as soon as I walk through the door due to a text message misunderstanding
Oh yes.. i gave up on trying to add emotion to my words.
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Old 07-21-2012, 02:36 PM   #18
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Wiring for an electric tankless water heater


Oh, please. It is not that I didn't like actual advice, it was the tone. Petey is all attitude, a fact which andrew79 acknowledged with his reference to
"harsh remarks". If it gives the lot of you comfort to band together to defend him, so be it. It not only doesn't change the facts, it completely contradicts them.
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Old 07-21-2012, 04:20 PM   #19
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Wiring for an electric tankless water heater


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Originally Posted by madleader
Oh, please. It is not that I didn't like actual advice, it was the tone. Petey is all attitude, a fact which andrew79 acknowledged with his reference to
"harsh remarks". If it gives the lot of you comfort to band together to defend him, so be it. It not only doesn't change the facts, it completely contradicts them.
Hey don't drag me into this. I went back and reread everything and I don't see a problem at all with the first post.
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Old 07-21-2012, 06:19 PM   #20
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Wiring for an electric tankless water heater


I think we sometimes forget that this is a "DIY" site....the whole object being "Do It Yourself"......not, 'lets avoid any liability'.....

When I first came here, I was a bit taken back by the 'Your not qualified' attitude.....some of the cases I understand....like 'how much something costs'....and in some cases I think some of the answers are too quick to suggest "Get an Engineer".....the fine line is deciding when something is DIY vs 'Get an Expert'....

By now most of you know that I'm not much of a PC person....but I'm also not a fan of doing stupid things.

Now....tankless water heaters....I've done a lot of research on them....

I don't see them being that hard to do a DIY install.....however, a lot of the warranties will be voided if not done by a licensed plumber. Hence, Speedy's question was a valid one....because I'm sure the next post after it was answered would have been the warranty issue.

Except for the POU units that run off 120Vac, all the other ones I have seen have to be hardwired in....in other words, you need a box and the connections are inside the box. No plugs.

Lastly....if you planned to use the dryer plug, what are you doing for a dryer? Going to gas? If you have gas....a gas tank water heater is actually more economical.
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Old 07-21-2012, 08:03 PM   #21
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Wiring for an electric tankless water heater


Hopefully useful advice:

Tankless water heaters use HUGE amounts of power. Usually more than the rest of the house combined. They always need their own circuits specially sized and installed from the panel. Many of them require more than one circuit due to the giant load. For tankless heaters, more power is better. They often don't heat the water adequately, especially in colder climates where the starting temperature of the water is low. A 54A heater is almost 13kW, which is fairly good. That will probably do fine for your house if you live in a moderate climate and use low-flow shower heads and faucets.

Whatever the instructions say, follow them. They will specify what breaker to use and possibly even what wire size to use. If it's a 54A nameplate load, it will probably be a 60A breaker and #6 wire. It will be cheapest to put the heater near the electrical panel so you don't have to run a bunch of heavy wire and install a separate disconnect. But if they aren't close together, you'll need a disconnect near the heater or a lockable breaker in the panel.
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Old 07-21-2012, 09:05 PM   #22
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Wiring for an electric tankless water heater


Madleader......most of the folks here are true professionals and clear up a lot of misinformation that is handed out at the big box stores.
They all err on the side of caution and codes as electricity many times does not give second chances before serious injury or death.
You came looking for information and you got excellent information. Just lighten up and accept the free service these professional offer as they will keep you out of trouble if you listen.
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Old 07-22-2012, 09:37 AM   #23
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Wiring for an electric tankless water heater


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Originally Posted by madleader View Post
Petey is all attitude, a fact which andrew79 acknowledged with his reference to
"harsh remarks". If it gives the lot of you comfort to band together to defend him, so be it. It not only doesn't change the facts, it completely contradicts them.
I will soon be posting pictures of my whole house generator install and asking for comments. If SP goes all harsh on me because I did something horribly wrong and it saves my family, he can be as harsh and condescending as he wants to be.
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Old 07-22-2012, 04:50 PM   #24
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Wiring for an electric tankless water heater


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I will soon be posting pictures of my whole house generator install and asking for comments. If SP goes all harsh on me because I did something horribly wrong and it saves my family, he can be as harsh and condescending as he wants to be.
As far I know SP he can be harsh but don't underestamte moi as well I have see some crazy stuff ( both Americian and European side ) so what we do is try to steer in correct direction to save alot of greif when they find out in hard way but unforetally some of them it kinda little late but lesson learned.

Merci,
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Old 07-22-2012, 04:53 PM   #25
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Wiring for an electric tankless water heater


Lets face it, Speedy Pete is 'Brutally Honest' and some people just need a lot more sugar than others to digest what he says...


Hope you don't take offense Speedy.
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Old 07-22-2012, 04:56 PM   #26
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Wiring for an electric tankless water heater


Quote:
Originally Posted by mpoulton View Post
Hopefully useful advice:

Tankless water heaters use HUGE amounts of power. Usually more than the rest of the house combined. They always need their own circuits specially sized and installed from the panel. Many of them require more than one circuit due to the giant load. For tankless heaters, more power is better. They often don't heat the water adequately, especially in colder climates where the starting temperature of the water is low. A 54A heater is almost 13kW, which is fairly good. That will probably do fine for your house if you live in a moderate climate and use low-flow shower heads and faucets.

Whatever the instructions say, follow them. They will specify what breaker to use and possibly even what wire size to use. If it's a 54A nameplate load, it will probably be a 60A breaker and #6 wire. It will be cheapest to put the heater near the electrical panel so you don't have to run a bunch of heavy wire and install a separate disconnect. But if they aren't close together, you'll need a disconnect near the heater or a lockable breaker in the panel.
Let you know that Mpoulton is correct on that one as well and I have installed and hooked up few electrique tankless water heater in both USA and France side so I know the differnce.

I have one customer which he want a serious sized whole house tankless electrique verison I did mention about gaz verison he kinda scuffed want to stay with electrique verison then I say ok., pas de probem but will not like my price due have to hevey up the service to 320 class ( aka 400 amp resdentail service ) and have to let the POCO know it allready hevey up and they end up change the transfomer to advoid the blow out on that one due the new tankless unit was 24 Kw.

That customer used that for short while and finally went to gaz verison due they did not like the flickering on the luminaires.

For our European verison it pretty easy to do this due we have triphase at 415 volts so that is not a issue. ( service size that is the only holding back with it )

Merci,
Marc
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Old 07-22-2012, 05:54 PM   #27
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Wiring for an electric tankless water heater


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Originally Posted by stickboy1375 View Post
Lets face it, Speedy Pete is 'Brutally Honest' and some people just need a lot more sugar than others to digest what he says...


Hope you don't take offense Speedy.
I guess you could say that, and I don't take offense at all.

I think you nailed it. Some people need to be talked to like a scared child, softly and slowly. Some folks cannot handle simple truths and facts explained in a frank manner.
I fully admit I am NOT sugary and sweet (although I can be when needed). If this gets me in trouble from time to time, or if someone takes it the wrong way and gets all bent out of shape, I am OK with that. At least I got the message across with the importance I felt it deserved.
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Old 07-22-2012, 06:09 PM   #28
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Wiring for an electric tankless water heater


We need to give old grumpy Petey a little leeway. That part time job he took in the electrical department at Home Depot must be pretty stressful. Not to mention the HI classes he is teaching on the weekends.
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Old 07-22-2012, 06:13 PM   #29
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We need to give old grumpy Petey a little leeway. That part time job he took in the electrical department at Home Depot must be pretty stressful. Not to mention the HI classes he is teaching on the weekends.
Cinq, quatre, trois, deux, un, zéro .,,,,


I am behind the door in case speedy say something very loud.

Merci,
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Old 07-22-2012, 10:29 PM   #30
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Wiring for an electric tankless water heater


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I bought a 240v water heater, assuming I could plug it into the dryer outlet. Unfortunately, the water heater is a 54 amp draw, while the dryer breaker is only 30 amps. I assume I need to get a 60 amp breaker, but do I need to re-wire that line as well?
Take it back. Tankless water heaters are energy hogs. In some cases they are necessary, but I'd put an addition on to house a standard tank water heater before I would buy a tankless electric.

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