They are low current. They don't draw much and they are self-controlled. They only come when temps are at freezing 2C and go off when not needed. They are designed to run. I believe a timer might be OK. In other words, have it come back on at 3 am in time to melt the water for wake up. Yes, you could use the timer to shut it off at 5 pm when the birds go to roost.
Those little timers are pretty cheap. $6 at WalMart. More other places, but not much.
Those little timers are pretty cheap. $6 at WalMart. More other places, but not much.