How to connect the BALLU IR heater to the thermostat?

Jeanne asks:

A three-core cable is allocated for the 0.1 kW BALLU heater, according to the instructions, a three-core cable with a cross section of at least 1 mm is also needed. A temperature controller of the same company, I first connected a two-wire cable and a plug, 2.5 mm cross-section, and only then I saw that there was a three-wire cable on the heater, in the store, on the advice of the seller, I bought a three-core with a cross section of 1.5 mm and I don’t know how to collect all this. If you put the cable 2 * 2.5, then what to do with the ground wire?

The answer to the question:

Hello! Let's go in order:

0.1 kW heater? Maybe 1 kW?
Three veins in him are visible: phase, zero and ground.
Which thermostat?
Do not understand what is your problem? What you do not understand where to connect the third wire? Its directly to the heater, the thermostat to the network, the heater to the thermostat.
The cross-section of the wires and 1.5 and 2.5 are suitable, you yourself write that in the instructions in general 1 mm² is indicated.

If you have a Ballu BMT-1 thermostat, then here is its connection diagram.