First of all welcome to the FORUMS. I'm sure that some one will be able to help with the issue you are having. As you stated, the breaker controls the water heater so that indicates to me that you have a gas/electric water heater. You said that you replaced the heating element but the new one could have gone bad. As suggested, turn the electric switch on the heater off until you can trouble shoot the problem further. Another possible issue is that if that breaker controls a GFCI outlet, that outlet may have tripped also. Reset all of your GFCI outlets to see if that helps.
Tom and Margaret
2014 Berkshire 390bh-60