1. The knob on the far left, when turned clockwise, is in winter mode (heating and bathing). Turning to the right is for a higher temperature, turning to the left is for a smaller temperature, and AUTO is a rapid heating function.
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2. Turn the knob on the left counterclockwise, and the scale of the knob points to shutdown. Turn it downward again for summer mode (only hot water is provided for bathing).
3. The knob on the right is the sanitary hot water temperature adjustment knob.
4. The gauge on the right is a double-needle gauge, the upper needle is a temperature gauge, and the lower gauge is a pressure gauge (heating water). Generally speaking, the normal operating pressure is between 0.5-1.5.
This is Beretta's Qiao series, which is basically the same as the Lidner series of Hiab wall-mounted boilers.