I had a tankless water heater installed and after a lot of trouble with it, it died. So, I want to go back to a regular tank water heater. Can I hook it up to the existing electric service to the tankless, which is really big: two pole 60 amp breaker with a 6 or 8 wire?

I have the feeling that this might be dangerous but I'm not sure.

I had a tankless water heater installed and after a lot of trouble with it, it died. So, I want to go back to a regular tank water heater. Can I hook it up to the existing electric service to the tankless, which is really big: two pole 60 amp breaker with a 6 or 8 wire?

I have the feeling that this might be dangerous but I'm not sure.
Wire size is fine. You will need to change the breaker to a two pole 30A.

Once to get the Water heater, let us know, and we will tell you how to hook it up (if you need help).

Okay, that makes sense. Thanks a lot Washington1!