Water Heater Circuit Breaker Size

[Mike Lamb]

What would be an appropriate sized breaker for this WH?

[Mike Lamb]

I am replacing a 2 pole 30 amp breaker - if that is the right size - for this tank. Murray panels and breakers are discontinued. Need help as to what specific breaker should I get? This is beyond my expertise.

[Marc]

30 Amp.

[Bill Kibbel]

  Quote

What would be an appropriate sized breaker for this WH?

Expand  

23.4 amps. You won't find one, so

25 Amps.  Might not find one, so

30 amps. You'll find one.

[Jim Katen]

Like Bill said, a 25- or 30-amp breaker is fine - IF you have 240-volt power. 

I'd use a Siemens brand breaker. They've owned the Murray line for quite a while. 

[Mike Lamb]

Thanks.

[mtwitty]

Both 25 and 30 amp are compliant if the supply is 240 volts. If the supply is 208 volts, only a 25 amp breaker is allowed.

[Marc]

Why? Assuming the OCP device is sized to protect the circuit conductors.

[mtwitty]

  On 6/27/2022 at 2:16 PM, Marc said:

Why? Assuming the OCP device is sized to protect the circuit conductors.

Expand  

The NEC states that the OCD is "not to exceed" 150% of the rated current. 422.11(E)(3) At 208 volts, that current would be 24.4 amps. The next standard size breaker is 25, which is the only one allowed in this scenario.

[Marc]

After all these years..I had no idea.

[mic20]

I installed the same WH I bought from LINK DELETED. They helped me install it and the size of the circuit breaker is 30 amp.

Edited August 2, 2022 by Bill Kibbel

[Bill Kibbel]

  On 8/2/2022 at 6:07 AM, mic20 said:

I installed the same WH I bought from LINK DELETED. They helped me install it and the size of the circuit breaker is 30 amp.

Expand  

What's the voltage there in Romania?