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Old 10-11-2009, 07:58 PM   #1
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tankless water heater wiring


I need to replace my water heater, and am thinking about a tankless one. It appears the tankless heaters all require at least 3 40 amp breakers, and I do not have that much room in my panel. The current heater is using a 240 V double with 30 amp on each. Am I looking at a subpanel? or is there some way to make this work?

Thanks
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Old 10-11-2009, 08:07 PM   #2
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What size is your existing service? Try searching in this forum for this topic and you'll see some of the negatives of on demand electric heaters.
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Old 10-11-2009, 08:09 PM   #3
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unforetally that is true the tankless waterheater you look that required 3 X 40 amp circuits that is pretty serious unit and you need 200 amp service to just get squeak by without getting the main breaker trip.

If you have 100 amp service just forget it you will trip it no question asked.

But with 200 amp service it will depending on what other hevey stuff you have on and the size of the house and what we do is the load demand caluations { you can able goggle it }

However if you are pretty close to the boarderline where the point the 200 amp will not cut it we install 320 service { pair of 200a panels in there} but the cost I don't know if that justify it or not and many POCO are getting strict with this so check it around

I am sure other readers will chime in with more info.

Merci,Marc
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Old 10-11-2009, 08:12 PM   #4
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Most likely will need a subpanel, but more than that, your existing service may not support that much of a load.Having to upgrade to a 320/400A service will be very expensive.

Personally, I don't think the electric type of on demand heaters are worth the money, but the gas type are.
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Old 10-11-2009, 08:16 PM   #5
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I have 200 amp service, but with the finished basement, there is no more space in the panel.
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Old 10-11-2009, 08:19 PM   #6
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You are probably looking at a service upgrade to 320/400A.

Welcome to the world of on demand water heaters. They are NOT all they they are cracked up to be.
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Old 10-11-2009, 08:21 PM   #7
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Quote:
Originally Posted by Speedy Petey View Post
You are probably looking at a service upgrade to 320/400A.

Welcome to the world of on demand water heaters. They are NOT all they they are cracked up to be.
Maybe you're missing something here. You could market them as "whole house dimmers".
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Old 10-11-2009, 08:24 PM   #8
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Quote:
Originally Posted by Speedy Petey View Post
You are probably looking at a service upgrade to 320/400A.

Welcome to the world of on demand water heaters. They are NOT all they they are cracked up to be.

Apart from the apparent negative vibe I am getting about the water heater, what kind of ballpark figure to upgrade the service?
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Old 10-11-2009, 08:26 PM   #9
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Quote:
Originally Posted by jerryh3 View Post
Maybe you're missing something here. You could market them as "whole house dimmers".
MDR!!! { LOL !!!}

Anyway seriously that is true and we call them transfomer cooker due they are good for burning out the POCO transfomer and they get ticked off.

Here in France we do have tankless electric waterheater but it wired on triphase {415 volts } and not too bad on transfomer but don't go there with electric rates it and it not worth it so stick with tank type or go with gaz tankless heater that far much cheaper than electric verison is but still have to upgrade the gaz system to handle burner size.

Merci,Marc
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Old 10-11-2009, 08:27 PM   #10
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Quote:
Originally Posted by SR996 View Post
Apart from the apparent negative vibe I am getting about the water heater, what kind of ballpark figure to upgrade the service?

At least double over normal 200 amp service upgrading due there are few diffrent ways we can do with class 320 system.

Most common is 2X 200 amp panels but yeah we can get single 400 amp panel but the cost will knock ya out.

Merci,Marc
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Old 10-11-2009, 08:33 PM   #11
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Quote:
Originally Posted by frenchelectrican View Post
At least double over normal 200 amp service upgrading due there are few diffrent ways we can do with class 320 system.

Most common is 2X 200 amp panels but yeah we can get single 400 amp panel but the cost will knock ya out.

Merci,Marc

Isn't it ... like 3:30 am in France right now?
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Old 10-11-2009, 08:38 PM   #12
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Quote:
Originally Posted by SR996 View Post
Isn't it ... like 3:30 am in France right now?

Oui I work at diffrent shedule I don't start until 0800 so I am still full awake

Merci,Marc
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Old 10-11-2009, 11:16 PM   #13
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Quote:
Originally Posted by SR996 View Post
Apart from the apparent negative vibe I am getting about the water heater, what kind of ballpark figure to upgrade the service?
Without a look at the site or pictures, and a knowledge of the rates in your area there is no way to tell.
I will say, it will be more than a 200A upgrade. So you can figure at least more than $2500. Probably somewhere around $4-$5k
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Old 10-11-2009, 11:25 PM   #14
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Yea, probably something in that range. It's a damn nice system though.
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Old 10-12-2009, 06:47 AM   #15
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Read this


Before you go tankless read very good info http://waterheaterrescue.com/pages/W.../tankless.html
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