Help me calculate my service load

[EJ797]

Hello,
I am trying to figure out the service requirements for an addition to my home. I will be hiring a licensed electrician to handle the actual work but I am in the planning stages and have not been able to find someone able to do the calculations for me. I was trained in basic electrical principals by the US Air Force and understand the math side of things. I've also spent a bunch of time familiarizing myself with the code but I've never done this before and have no experience. I believe in educating myself and not blindly following anyone so I'm hoping those of you with more experience and know how will help me understand my options.

I have an existing 200 amp service and the big question is whether I have to upgrade service. The tankless water heater requires 3 separate 40 amp 240 volt branch circuits.

Please let me know if my calculations are correct and if not where I went wrong. I truly appreciate your time and any help you can provide.

I look forward to hearing from you.

Here it goes.
I pulled my plate information from every piece of equipment in my house.

Here it is:

Here are my calculations for my existing service:

Here are my calculations for my proposed service:

 

[brantmacga]

All of the image links appear broken, so I can’t see any of what you’re trying to share. This thread may get locked, so wanted to get in and tell you to read through annex E in the NEC for help with load Calc examples.


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