Thanks everyone. I don't like my subpanel setup. It's a big mess to
upgrade and a long run in an old house to try to pull new wire. I'll just
replace this failing tank water heater with another tank water heater.

Regards
Bill


"Bill C" wrote in message
. ..

Hello,



Can someone please tell me what AWG copper line is required to service a
68.5 amp 240vac tankless water heater? The manufacturer recommends an 80
amp breaker.



Thank you

Bill