Boiler Sizing Replacement Guide

5
TABLE B: HEAT LOSS TABLE (in BTU/Hr.)
(Calculated at 70°F Design Temperature Dierence
TABLE B (continued)
FLOOR
AREA
SQ. FT.
CONSTRUCTION DESIGN NUMBER
1 2 3 4 5 6 7 8 9 10 11
500 28,750 23,900 27,350 22,510 18,080 16,860 17,910 16,160 15,460 15,110 15,360
600 32,300 27,030 30,620 25,350 20,520 19,200 20,460 18,360 17,520 17,100 17,490
700 35,860 30,150 33,900 28,190 22,970 21,540 23,010 20,560 19,580 19,090 19,610
800 39,840 33,590 37,600 31,350 25,640 24,080 25,760 22,960 21,840 21,280 21,920
900 43,340 36,680 40,820 34,160 28,050 26,380 28,270 25,120 23,860 23,230 24,010
1000 46,890 39,800 44,090 37,000 30,500 28,720 30,820 27,320 25,920 25,220 26,140
1100 50,450 42,920 47,370 39,840 32,940 31,060 33,370 29,520 27,980 27,210 28,270
1200 54,000 46,040 50,640 42,680 35,390 33,400 35,920 31,720 30,040 29,200 30,400
1300 56,640 48,470 53,000 44,830 37,340 35,300 38,030 33,480 31,660 30,750 32,120
1400 60,200 51,590 56,280 47,670 39,790 37,640 40,580 35,680 33,720 32,740 34,240
1500 62,830 54,030 58,630 49,830 41,740 39,540 42,690 37,440 35,340 34,290 35,970
1600 65,530 56,490 61,050 52,010 43,730 41,480 44,840 39,240 37,000 35,880 37,730
1700 68,590 59,250 63,830 54,490 45,910 43,570 47,140 41,190 38,810 37,620 39,630
1800 71,720 62,040 66,680 57,000 48,130 45,710 49,490 43,190 40,670 38,410 37,950
1900 73,930 64,150 68,600 58,830 49,860 47,410 51,400 44,750 42,090 40,760 43,120
2000 77,050 66,940 71,450 61,340 52,080 49,550 53,750 46,750 43,950 42,550 45,070
FLOOR
AREA
SQ. FT.
CONSTRUCTION DESIGN NUMBER
12 13 14 15 16 17 18 19 20 21 22 23
500 14,660 14,310 30,360 25,520 28,960 24,120 32,780 27,940 31,380 26,540 5,130 4,350
600 16,650 16,230 34,060 28,790 32,380 27,110 36,690 31,420 35,010 29,740 6,150 4,730
700 18,630 18,140 37,760 32,050 35,780 30,090 40,600 34,890 38,650 32,930 7,180 5,220
800 20,800 20,240 41,920 35,670 39,680 33,430 45,040 38,790 42,800 36,550 8,210 5,600
900 22,750 22,120 45,560 38,910 43,040 36,390 48,890 42,240 46,370 39,720 9,230 5,980
1000 24,740 24,040 49,260 42,170 46,460 39,370 52,810 45,720 50,010 42,920 10,250 6,370
1100 26,730 25,960 52,960 45,430 49,880 42,350 56,720 49,190 53,640 46,110 11,300 6,750
1200 28,720 27,880 56,660 48,690 53,300 45,330 60,630 52,670 57,270 49,310 12,330 7,150
1300 30,300 29,390 59,360 51,200 55,720 47,560 63,450 55,290 59,810 51,650 13,340 7,330
1400 32,280 31,300 63,060 54,460 59,140 50,540 67,360 58,760 63,440 54,840 14,370 7,720
1500 33,870 32,820 65,770 56,970 61,570 52,770 70,180 61,380 65,980 57,180 15,400 7,920
1600 35,490 34,370 68,540 59,500 64,060 55,020 73,050 64,020 68,570 59,540 16,420 8,110
1700 37,250 36,060 71,710 62,370 66,950 57,610 76,390 67,050 71,630 62,290 17,440 8,400
1800 39,060 37,800 74,950 65,270 69,910 60,230 79,780 70,110 74,740 65,070 18,480 8,690
1900 40,460 39,130 77,190 67,410 71,870 62,090 82,080 72,300 76,760 66,990 19,500 9,270
2000 42,270 40,870 80,420 70,310 74,820 64,710 85,470 75,360 79,870 69,760 20,600 9,560
NOTE: The BTU figures in this table are based upon AHRI NET calculations where ceiling height is 8 ft. and where total window and door areas
do not exceed 20 percent of the GROSS wall area. For 9 ft. ceiling height add 11 percent to heat loss; for 10 ft. ceiling height, add 22 percent. For
lower levels ONE HALF or LESS below grade level, use FIRST FLOOR heat loss.