Why have something that needs to be turned on and off? simply bury a miniature radiothermal source under your driveway and keep it toasty warm 24/7.

It might be a profoundly awful idea, but in terms of laziness it's completely passive, no needing to toggle a switch or similar to activate it. Not my area of expertise but I'd imagine if you design the system just right you could have a solid-state heat distribution system so no worries about water pumps breaking down.