Can you fine-tuning the thermostat on an electric dampen furnace minus turning the breaker past its sell-by date? Also, if not, how can you share that the electric to the...

Also, if not, how can you share that the electric to the water heating system is off? I am not sure which breaker go to what.
Answers:    If you mean by CHANGE the thermostat, that you want to replace the entire thermostat next to a new one, afterwards NO. If you mean can you transmute the temp. on a water kiln thermostat without shutting sour the breaker, YES you can. However, most newer heaters have a non-adjustable, factory set top thermo, so the individual one you could change would be the bottom one. If you're varying the entire thermostat, look for double breakers of at least 30 amps within the box. There shouldn't be that many of them, shut them adjectives off. Most collectively, the only four appliances contained by a home that would run on 220 volts would be an electric range, which would require a 50 amp double breaker, or a dryer, the dampen heater, or a marine pump. It shouldn't be terribly inconvenient to enjoy all of these shut down for the 10 - 15 min.'s it take to change out the thermostats. When you're done, purely turn them all stern on.
Yes you just turn the thermostat knob slightly to the departed..