BTU Heat Chart
This chart is a guideline for heat needed with an approximate 8' ceiling height.
Square Ft
Typ. Size
10° F
20° F
30° F
40° F
50° F
60° F
70° F
80° F
400
20x20
10,640
21,280
31,920
42,560
53,200
63,840
74,480
85,120
600
20x30
15,960
31,920
47,880
63,840
79,800
95,760
111,720
127,680
800
20x40
21,280
42,560
63,840
85,120
106,400
127,680
148,960
170,240
1,000
20x50
26,600
53,200
79,800
106,400
133,000
159,600
186,200
212,800
1,200
20x60
31,920
63,840
95,760
127,680
159,600
191,520
223,440
255,360
1,400
20x70
37,240
74,480
111,720
148,960
186,200
223,440
260,680
297,920
1,650
30x55
43,890
87,780
131,670
175,560
219,450
263,340
307,230
351,120
1,800
30x60
47,880
95,760
143,640
191,520
239,400
287,280
335,160
383,040
1,950
30x65
51,870
103,740
155,610
207,480
259,350
311,220
363,090
414,960
2,250
30x75
59,850
119,700
179,550
239,400
299,250
359,100
418,950
478,800
2,400
30x80
63,840
127,680
191,520
255,360
319,200
383,040
446,880
510,720
2,550
30x85
67,830
135,660
203,490
271,320
339,150
406,980
474,810
542,640
2,800
40x70
74,480
148,960
223,440
297,920
372,400
446,880
521,360
595,840
3,000
40x75
79,800
159,600
239,400
319,200
399,000
478,800
558,600
638,400
3,200
40x80
85,120
170,240
255,360
340,480
425,600
510,720
595,840
680,960
3,400
40x85
90,440
180,880
271,320
361,760
452,200
542,640
633,080
723,520
3,600
40x90
95,760
191,520
287,280
383,040
478,800
574,560
670,320
766,080
3,800
40x95
101,080
202,160
303,240
404,320
505,400
606,480
707,560
808,640
4,000
50x80
106,400
212,800
319,200
425,600
532,000
638,400
744,800
851,200
4,250
50x85
113,050
226,100
339,150
452,200
565,250
678,300
791,350
904,400
4,500
50x90
119,700
239,400
359,100
478,800
598,500
718,200
837,900
957,600
4,500
50x90
119,700
239,400
359,100
478,800
598,500
718,200
837,900
957,600
4,750
50x95
126,350
252,700
379,050
505,400
631,750
758,100
884,450
1,010,800
5,000
50x100
133,000
266,000
399,000
532,000
665,000
798,000
931,000
1,064,000
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