Ask Mr Wizard Fluctuating mash temperatures Q Just how critical is temperature control in all-grain brewing? I have recently built a basic three-tier all-grain system out of three converted kegs. I am in the Air Force, and currently stationed in England. Unfortunately, I must brew outdoors. This time of year the weather is cold, cloudy, windy, wet, and rainy especially on the weekends during my brewing sessions. I have brewed six 5-gallon batches (witbier, honey wheat, Trappist ale, ESB, brown ale, and a kΓΆlsch) and with every batch I have had a difficult time keeping my target temperature of 152° to 154° F. My temperatures bounce back and forth between 145° and 160° F. I usually hold my target temperature for 75 minutes of the 90-minute mash. When the temperature does fluctuate, I get it back to the target as quickly as possible. The batches have turned out with a normal OG for their particular style, and they have tasted great. My goal is to constantly improve my brewing techniques and create the best brew possible. Should I be concerned with these temperature fluctuations? If so, do you have any suggestions for controlling the temperature in my battle with this wicked weather? A Mash temperature in all-grain brewing has a significant and demonstrable affect on beer flavor. In general, multi-temperature mash profiles incorporating temperature rests from 120* to 160* F will produce more fermentable worts than single temperature mashes held between 152* and 154* F. Read More |
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