From Dark and Darker Wiki
Assuming magic power bonus is 0% you would heal 2.4 per tick with your example.
Without any magic healing(MH) you should heal 2 per tick. The current attribute bounus ratio is 10%. A rough estimate for each MH increase the amount healed per tick by 0.1. Example 22 MH would heal for 4.2 per tick. 2 from torture mastery base and 2.2 from current MH