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pana8432
200 amp service

I have 200 amp service and I am planning on adding a bathroom that will contain it's own electric hot water heater. My breaker box is full (short box), what size of breaker do I need for the hot water heater and how do I know if I have enough service left to run a subpanel for the new addition?

NEC

Probably a two pole 30A breaker for the water heater.

You can run a load calculation for the house.

Here is a calculator. Just follow the directions.

(The calcs are for electricians, But, I think easy enough to understand. Please let me know a question or problem with them.)

Ernie_Fergler
pana8432 wrote:

I have 200 amp service and I am planning on adding a bathroom that will contain it's own electric hot water heater. My breaker box is full (short box), what size of breaker do I need for the hot water heater and how do I know if I have enough service left to run a subpanel for the new addition?

In the commonwealth here {Pa.} you are allowed to add a 100 amp sub panel. Just wondering what you mean by a {short box},though.:confused:

NEC
Ernie_Fergler wrote:

In the commonwealth here {Pa.} you are allowed to add a 100 amp sub panel. Just wondering what you mean by a {short box},though.:confused:

Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.

Ernie_Fergler
NEC wrote:

Guess less than 42 circuits........... 42 circuit requirement was lifted in the 2008 NEC. About time.

That was my thinking as well NEC. And also always wondered about reasoning pertaining to that in the code as well.