I currently have a well water set up. I have an electric water heater (50 gallon / 240v / 30 amp breaker). It is on its way out and I would like to upgrade to a tankless water heater (electrical would be the easiest / although I do have propane on the property). The tankless water heaters that I can find are 240v / 60 amp. My breaker panel box is 200 amps. Would i have to substitute the 30 amp for a 60 amp breaker and up grade the wiring to make the tankless water heater work? Is substituting the 30 amp breaker as easy as buying a 60 amp and putting it in? Or do I need more room in the breaker panel box to add the 60 amp? I am a general contractor so I have a better idea of how to work through issues, but electrical has never been my strength. Any sort of advice would be appreciated.