You know, I might have bought one, if I had not read the fine print. Not all triac switching devices have such a high minimum current- so it happens, the one you picked up was suited also for switching a 3000W resistive load (12.5A@240V). That's a
big fucking triac.
There certainly are
triacs around suited for switching low currents (200mA). The tstat you found was intended for direct control of a big resistive load and thus had a triac much gruntier than you need for a blower fan.