Regarding electric heaters, I learned a very hard lesson several years ago. I had been using a pretty nice oscillating heater with a built-in thermostat. Unfortunately, if the power goes off, these types of heaters do not turn themselves back on. The power doesn't have to be off very long for this to happen. A flicker might do it.
We left the house to visit family and friends over Christmas and were gone a week. Apparently, there was an outage. I lost dozens and dozens of little coffee saplings. (Strangely, a few saplings survived. I have no idea if a tiny minority of coffee trees are slightly more cold tolerant than most or not. It's not the kind of experiment I want to repeat.)
If there's any chance you won't be on site to monitor and remedy any power outages, I strongly recommend a basic heater with no electronics. Since then, I've used a thermostat-free blower type heater and an oil-based radiator type heater. If the power is on, these heaters are on. Fortunately, basic heaters tend to be less expensive than the fancy ones with thermostats.