Originally Posted by atreid
Direct firing temperature adjustments are kind of the worst... You get a crappy temperature gradient, you tend to overshoot or undershoot depending of where is the sensor or how tall your grain bed is, you apply direct high heat to part of the grain bed... plus you want to control gas flow, which might not be harder than controlling a pump or a heating element, but is sure the less secure approach. HERMS and RIMS setups sure look better in pretty much every aspects...
Is there a reason why you would want to direct fire your MLT instead of the other options?
I know there are a million threads debating RIMS vs Direct fire vs HERMS. I already have a burner under my mash tun that Ive been using for the heat and stir method, so it only seems natural to run with a direct fired rims. I thought about moving to a RIMS, but i dont know if it is worth scrapping a portion of my system for a complete redesign. I've got to imagine that whether its a RIMs tube or HERMS, just about every system is going to have some degree of "yo-yoing" on the temperature.
Plus one of the most copied systems of all times uses a direct fired RIMS.