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I converted from LP to NG 3 years ago for my three burner Brutus 10 brewstand using a bbq grill quick disconnect. Even though I don't have the BTUs of LP, it is really reassuring that I never have to worry about running out of gas during my brew day.
Isnt PBW just really Souped up Oxyclean? Essentially an alkaline cleaner?
Jeff Renner's is about 22qt IIRC.This is how Jeff Renner does his cereal mash for CAP. I think he has a really big pressure cooker.
I think mine is 20 qt. With a larger inner container, I could do a pretty sizable decoction in there.
I seem to recall somebody did a side by side comparison of a beer with a decoction mash and a step mash with melanoidin malt and had a bunch of people judge the beer and people noticed a difference but thought the melanoidin malt beer was smoother and more pleasant. I seem to think Nateo posted it on his blog a long time ago but I haven't seen him around these parts in a while.
Outside of maybe making more starches easily available for conversion, I'm not a huge believer that decoction mashes offer a lot that a step mash doesn't but there is probably a subtle difference. I imagine very long boils on the decoction probably makes more of a difference but a 10-15 minute boil probably isn't creating as many flavor compounds. I do know some pro brewers swear by decoction mashes when using undermodified malt. I can see the need for the decoctions to help with conversion.
Since I don't have mash tuns that sit on burners I have to do my step mashes by decoction or infusion. I've never made a beer with a decoction mash I disliked but I also haven't found that magic touch either.
This is how Jeff Renner does his cereal mash for CAP. I think he has a really big pressure cooker.