I use the "belt AND suspenders" approach. I recirculate StarSan through my pump for about 5 minutes, then at the end of the boil I recirc boiling wort for 5-10 min.
or you can also use some hot water from the HLT to run through the pump prior transfer as well. I also like to run hot water through the pump to do a final cleaning prior to storage.
I could if I used a HLT!