circulator controller

ws9876

I was wondering who makes a good simple on off controller and thermostat for a small drainback system for hot water tank. The heat source is wood stove heat, not in the stove but more passive heat on the outer side of the stove. The stove sits about 6 ft above the hot water tank. I have seen a lot of controllers but was wondering about a simple
less expensive one that turns on the pump at a certain temp. And one that is easy to program and understand.