Automatic damper for wood heater

Going way off-grid DIY

Damper-control for wood-heated water heater using car battery and salvaged automobile power-window actuators.
Get fire box hot with solid oak, then slow down fire using damper so heat stays in metal stove, and wood burns all night.
Trying to figure out thermostat to control actuators so damper adjusts itself throughout night.
Maybe some off grid guy has such a rig... and he might email if I post the idea.