How do you wire a 2 pole line voltage thermostat to a 240 volt wall heater?

the thermostat will have two wire tails or connection points that are marked either "L1"and "L2" or "Line" ,the black and white wires from the breaker box or fuse panel hook to them. the other connections marked "T1" and "T2" or "Load" hook to the wall heater. don't forget the bare wire (the ground) in case the heater develops a short, it goes from the power source ,through the thermostat box, to the green screw on the heating fixture.