Theres nothing to say you have to step mash in a direct fired MLT either. I routinely do single infusions. Running a pump to recirc I've lost, at max in a frozen garage, 2 degrees in a n hour in a non-insulated keg kettle. Even that was lost through the hoses. At the end of the mash, you can kick on your heat to raise to mash out ( I wouldn't call this step mashing per se) if you want to.
Whats more, I put all of my mash water in at once and heat it to strike. No more need to worry about vol/temp issues to reach desired rest temp.
I love my DFMLT and wound't go back to a cooler tun even I got paid to do it. Seriously. I also realized a 5 pt increase in efficiency in going to the keggle MLT. Of course, I also began recirculating and that may have more to do with that.
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