I seems to me that 1000 watts is more than you need. I really like my temperature controller. When my single phase controller went out (I used it year around switching from using it for my chiller in the summer to my heater in the winter) I bought a dual phase
eBay: BRAND NEW DUAL STAGE LCD CONTROLLER FOR CHILLER/HEATER (item 190107372752 end time May-03-07 10:08:10 PDT) on Ebay. It is great!