Im working on trading my heritage for a mansfield,other heritage owners who have moved up to the mansfield ,have you noticed enuff of a differance to justify the expense....Im dealing with -20 temps and -50's wind chill and its been steady for weeks and more of the same forcasted...im thinking the extra 20-25 k btu output should let me sleep all night with out a reload going to bed at 9:00 pm up at 5:00 am heating a 1500 sq ft ranch top floor only..any thoughts???ZZZim