How to drain coffee machine saeco s-class incanto classic

Subject: How to drain boiler of Saeco Incanto Deluxe
I got an answer from Saeco Customer Service as follows:

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Good Afternoon,

All you need to do is have the machine turned on and up to temperature. Make sure that you have a full tank of water as well. Make sure the machine is set for hot water, then turn the knob on the side of the machine to start water flow. Once the water is flowing out, remove the water tank and, leaving the knob turned open so that the water that's in the system drains out. Once water stops coming out, close the knob and shut the machine off.
The water is now drained from the system.

Thank You,
Customer Service
Saeco USA
800-933-7876