Been keeping an eye out for this to become available for a while now since hopbomb tipped me off to it. Enjoy!
http://www.ora.tv/beergeeks (http://www.ora.tv/beergeeks)
Just watched this and was wondering how long does the hot rocks stay hot. Could you actually do a full boil using them :-\
Would you not get the same results boiling about 5L of first runnings down by about half?