Sub Panel

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  #1  
Old 05-18-07, 01:18 PM
JOB
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Sub Panel

Hello, I am going to purchase a tankless electric water heater. It requires -3- seperate 30 amp double pole circuit breakers to operate.

I would like to install a subpanel off my main panel . My main panel is a 200 amp Cutler-Hammer.

Will a 125 amp double pole breaker be sufficent to power the sub panel ?

Thank You
JOB
 
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Old 05-18-07, 01:21 PM
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Before you add the tankless water heater have a load calculation performed. Your existing service may not be big enough. You may need to add a second service to the house.
 
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Old 05-18-07, 01:27 PM
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but, yes, a 125amp sub panel would be fine. Do you have open stabs (2) in your main panel to accomodate the disconnect for the subpanel?
 
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Old 05-18-07, 01:28 PM
JOB
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My apology the tankless water heater requires -3- 40 amp double pole circuit breakers not -3- 30 amp breakers.


Thanks again for any input
JOB
 
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Old 05-18-07, 01:43 PM
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125 amps is still enough. As previously recommended, have the load calculation done. You hear sad stories of people who, when it comes time to sell, are forced to remove their tankless WH and reinstall a tank one because the tankless pushed their demand load above their service capacity (even though they never had any problems with the tankless).
 
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Old 05-21-07, 03:27 PM
JOB
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Thanks for the info was helpful, I'll let you know how I make out

Again Thanks
JOB
 
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