i put a veggie steamer in the bottom of my pot as a precaution. I don't mash out. The greenbayrackers calculator is very good for figuring out strike water temp and hitting your mash temp so you don't have to add heat.
@craigmw Do you also use the steamer tray as a strainer for collecting wort?
i use a silicone steamer at the bottom just to be safe. Something similar to this without the handles at the top. Was about 6-7 bucks at walmart although i cannot find the exact one on their website.
http://www.bedbathandbeyond.com/store/product/veggisteam-vegetable-steamer/1014624309
I did not notice any off flavors in my beer.
If you need to add a little heat to raise mash temp a few degrees, just do it gently and stir while heating.
Any heat on you should be stirring!
Mash out heating not mandatory IMHO.
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