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RECOVERY CAPACITIES
MODEL NUMBER STYLE
INPUT BTU/Hr.
TEMPERATURE RISE – DEGREES F – GALLONS PER HOUR
wo/Pump w/Pump Indoor Outdoor
NATURAL
40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140°
GBB136 GBBP136 * * 136,000 330 264 220 188 165 147 132 120 110 101 94
GBC186 GBCP186 * * 181,000 440 352 293 251 220 195 176 160 147 135 126
GBC264 GBCP264 * * 264,000 640 512 427 366 320 284 256 233 213 197 183
GBC331 GBCP331 * * 334,000 811 649 541 463 406 360 324 295 270 250 232
GBC399 GBCP399 * * 399,000 967 774 645 553 484 430 387 352 322 298 276
GBC512 GBCP512 * * 511,500 1240 992 827 709 620 551 496 451 413 382 354
GBC627 GBCP627 * * 627,000 1520 1216 1013 869 760 676 608 553 507 468 434
GBC726 GBCP726 * * 726,000 1760 1408 1173 1006 880 782 704 640 587 542 503
GBC825 GBCP825 * * 825,000 2000 1600 1333 1143 1000 889 800 727 667 615 571
GBC926 GBCP926 * 926,000 2245 1796 1497 1283 1122 998 898 816 748 691 641
GBC962 GBCP962 * 961,700 2331 1865 1554 1332 1166 1036 933 848 777 717 665
GBC1083 GBCP1083 * 1,083,000 2625 2100 1750 1500 1313 1167 1050 955 875 808 750
GBC1125 GBCP1125 * 1,124,700 2727 2181 1818 1558 1363 1212 1091 991 909 839 779
GBC1178 GBCP1178 * 1,178,000 2856 2285 1904 1632 1428 1269 1142 1038 952 879 816
GBC1223 GBCP1223 * 1,222,500 2964 2371 1976 1694 1482 1317 1185 1078 988 912 847
GBC1287 GBCP1287 * 1,287,000 3120 2496 2080 1783 1560 1387 1248 1135 1040 960 891
GBC1337 GBCP1337 * 1,336,600 3240 2592 2160 1852 1620 1440 1296 1178 1080 997 926
GBC1413 GBCP1413 * 1,413,000 3425 2740 2284 1957 1713 1522 1370 1246 1142 1054 979
GBC1467 GBCP1467 * 1,467,000 3556 2845 2371 2032 1778 1581 1423 1293 1185 1094 1016
GBC1570 GBCP1570 * 1,570,000 3806 3045 2537 2175 1903 1692 1522 1384 1269 1171 1087
GBC1630 GBCP1630 * 1,630,000 3952 3161 2634 2258 1976 1756 1581 1437 1317 1216 1129
GBC1758 GBCP1758 * 1,758,000 4262 3409 2841 2435 2131 1894 1705 1550 1421 1311 1218
GBC1826 GBCP1826 * 1,825,600 4426 3541 2950 2529 2213 1967 1770 1609 1475 1362 1264
GENERAL FLOW AND PIPING SPECIFICATIONS
Water Hardness
MODELS SOFT MEDIUM HARD
0-4 Grains Per Gallon 5-15 Grains Per Gallon 16 & Over Grains Per Gallon
Indoor Outdoor
T GPM
P MPS SHL
T GPM
P MPS SHL
T GPM
P MPS SHL
136 136 22 10 3.4 1-1/4 5.09 17 13 5.5 1-1/4 8.2 10 22 14.7 1-1/4 22
186 186 15 20 1.82 1-1/2 4.48 11 26 3 1-1/2 7.5 7 40 6.8 1-1/2 17
264 264 21 20 1.85 1-1/2 4.51 16 26 3.1 1-1/2 7.6 10 42 8.3 1-1/2 18.8
331 331 27 20 1.9 1-1/2 4.56 20 26 3.2 1-1/2 7.7 13 42 8.5 1-1/2 19
399 399 30 22 2.1 1-1/2 5.08 25 26 3.3 1-1/2 7.8 15 43 9 1-1/2 19.5
512 512 20 42 1.8 2 4.4 16 52 2.9 2 7 10 84 6.8 2 16.6
627 627 25 41 1.9 2 4.5 19 54 3.1 2 7.2 11 90 8.5 2 20.4
726 726 29 41 2 2 4.6 20 60 4 2 9.3 13 90 9 2 20.8
825 825 30 45 2.5 2 5.7 20 68 5.2 2 11.7 15 90 9.3 2 21.1
962 926 30 53 3.5 2-1/2 4.9 20 79 7.5 2-1/2 10.5 17 90 10.1 2-1/2 14.3
1125 1083 30 61 5.5 2-1/2 7.5 20 90 11.8 2-1/2 16 20 90 11.8 2-1/2 16
1223 1178 30 67 6.5 2-1/2 8.8 22 90 12 2-1/2 16.2 22 90 12 2-1/2 16.2
1337 1287 30 73 8.4 2-1/2 11 24 90 13.3 2-1/2 17.5 24 90 13.3 2-1/2 17.5
1467 1413 30 80 10.8 2-1/2 14.1 26 90 13.8 2-1/2 18 26 90 13.8 2-1/2 18
1630 1570 30 89 13.7 2-1/2 17.6 29 90 14.8 2-1/2 19 29 90 14.8 2-1/2 19
1826 1758 32 90 15.5 2-1/2 19.7 32 90 15.5 2-1/2 19.7 32 90 15.5 2-1/2 19.7
NOTE: Additional pipe fittings will increase the system head loss. Select a pump based on the water hardness, flow and system head loss. If water heater is
more than two stories above the tank, consult the pump manufacturer.
T – Temperature Rise, Degree F @ GPM Flow
GPM – Gallons per Minute Flow
P – Pressure Drop, Ft. thru Heat Exchanger
MPS – Minimum Pipe Size, NPT
SHL – System Head Loss
Sizing based on water heater and tank being placed 5 feet apart. The
equivalent length of pipe valves and fittings in the system is as follows.
1-1/4" NPT = 65 Ft (136)
1-1/2" NPT = 70 Ft (186-399)
2" NPT = 75 Ft (512-825)
2-1/2" NPT = 80 Ft (926-1826)