I have a 100 watt heater with a light dimmer also. I 100 watt is overkill but won't hurt a thing. I paid less than $5 shipped for it on ebay. I got the 100 watt because it was harder to find anything less expensive as cheap. For my needs the dimmer switch works just fine. Used a 3/4 inch piece of aluminum cut to fit the base of the press.
Floyd