[DIY] Water heater tripping circuit breaker

 

Hello learned DIYers,

I've got a 6 month-old 80 gal. elec water heater that tripped the double-pole 20 amp breaker. It may have happened twice over a 24 or 48 hour period, the facts are a little unclear here.

This unit is rated at 5500/4130 watts, which means it should probably be on a 30 amp circuit. The similar 80 gal heater that this one replaced operated trouble free on this circuit for 7 years. It appears that the wire from the "little gray box" timer to the heater is 10 guage...if it is 12g, replacing with 10 will be no problem. Hopefully a 10g runs from breaker to timer.

So, any theories on why it would start tripping this (undersized) breaker now?

Many thanks for your input,

-Wayne

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