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Discussion Starter · #1 ·
I want to upgrade to a tankless hot water heater. http://www.homedepot.com/p/Rheem-Ec...kless-Electric-Water-Heater-RETE-13/202514583

But it seems they pull a HUGE amount of amperage (like 58 amps) And require a 60amp breaker.

I have a 100amp service. I also have electric baseboard heat and an electric oven...

what is the general rule of thumb for reaching your service max?

Would I be able to install a subpanel? but am I still limited by my 100amp max for all devices running in the house?

whata you guys think?

this is my panel...







 

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Thom
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I think electric heat on a 100A panel is already overloaded but, who knows, maybe the house is an extremely well insulated 300 square foot home.

That means, do a real load calc.
 

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Discussion Starter · #4 ·
Is it possible to upgrade service without replacing the entire panel? (like only the incoming lines and breaker? Or are panels themselves the limiting factor?

also, whats the best way to do a load calculation?
 

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