Been thinking about going to a recirculated mash and adding a heating element to allow step mashes without adding water. Found an 800w silicone heating pad on ebay. Any reason I couldn't mount this between the Celotex insulation and the bottom of the mash tun? Should be able to regulate temps with an inkbird.
https://www.ebay.com/itm/BI-V2-5-3D...hDarwoV3BBEV2b&_trksid=p2047675.c100005.m1851
https://www.ebay.com/itm/BI-V2-5-3D...hDarwoV3BBEV2b&_trksid=p2047675.c100005.m1851