I thought my block heater said in the instructions it was 600 or 650 watts. By the way those installation instruction suck. The pictures and instructions in the forms are much better.
That ain't my dealer. My dealer don't know anything about block heaters. In fact I called a North Dakota toyota parts dealer to find out where they get their block heaters. Its was from a toyota parts warehouse in California. I had to give this information to my local toyota dealer to order me one.
I installed it myself. Not easy, the work was taking out the air cleaner housing and putting it all back in. The block heater was the easy part.
This is my third block heater. I had one on my '79 Olds Cutlass diesel and a 81 VW diesel.
To find toyota dealers in other states, I use the online
http://www.corp.att.com/directory/ or
http://yellowpages.superpages.com/profiler/abook.jsp