+1. When I sparged, I used to heat all my brewing liquor and drain off my sparge water into a cooler to keep it warm. It worked great.
However, these days, I no longer sparge. I just add a cpl bucks worth of grain to make up the loss in extract. I brew 5 gal batches and plan ~60% BH efficiency (I have a lot of dead space loss). Saves time, too.