Also who makes it? Mine is built for a server that would power a whole network of computers... I'm going to guess yours is built just to power 1 PC
What I have is very similar to this...
http://www.apc.com/resource/include/...sku=SUA1500X93
a 11inch flexwatt is 20watts... so for me... 11 pieces of flexwatt x 20w is only 220W which is like 1/4 of the Max power ... plus I use a Herp Pro which is a proportinal t-stat so it doesnt even use the full 20watts(usually around 20-40%).